@article {1338,
	title = {Salts of the cobalt(I) complexes [Co(CO)(5)](+) and[Co(CO)(2)(NO)(2)](+) and the Lewis acid-base adduct [CO2(CO)(7)CO-B(CF3)(3)]},
	journal = {Chemistry-a European Journal},
	volume = {12},
	number = {32},
	year = {2006},
	note = {ISI Document Delivery No.: 110YZTimes Cited: 4Cited Reference Count: 60Bernhardt, Eduard Finze, Maik Willner, Helge Lehmann, Christian W. Aubke, Friedhelm},
	month = {Nov},
	pages = {8276-8283},
	type = {Article},
	abstract = {The reaction of [Co-2(CO)(8)] with (CF3)(3)BCO in hexane leads to the Lewis acid-base adduct [CO2(CO)(7)COB(CF3)(3)] in high yield. When the reaction is performed in anhydrous HF solution [Co(CO)(5)][(CF3)(3)BF] is isolated. The product contains the first example of a homoleptic metal pentacarbonyl cation with 18 valence electrons and a trigonal-bipyramidal structure. Treatment of [Co-2(CO)(8)] or [Co(CO)(3)NO] with NO+ salts of weakly coordinating anions results in mixed crystals containing the [Co(CO)(5)](+)/[Co(CO)(2)(NO)(2)](+) ions or pure novel [Co(CO)(2)(NO)(2)](+) salts, respectively. This is a promising route to other new metal carbonyl nitrosyl cations or even homoleptic metal nitrosyl cations. All compounds were characterized by vibrational spectroscopy and by single-crystal X-ray diffraction.},
	keywords = {ALUMINUM HALIDES, ANIONS, carbonyl ligands, cobalt, density, density functional calculations, DICOBALT OCTACARBONYL, EXCHANGE, LIGANDS, METAL-CARBONYL CATIONS, NITRIC-OXIDE, NITROSYL, SOLID-STATE, SPECTROSCOPIC PROPERTIES, vibrational spectroscopy, VIBRATIONAL-SPECTRA},
	isbn = {0947-6539},
	url = {<Go to ISI>://000242418600008},
	author = {Bernhardt, E. and Finze, M. and Willner, H. and Lehmann, C. W. and Aubke, F.}
}
@article {1296,
	title = {Dynamic C-13 NMR studies of ligand exchange in linear (d(10)) silver(I) and gold(I) and square-planar (d(8)) rhodium(I) homoleptic metal carbonyl cations in superacidic media},
	journal = {Magnetic Resonance in Chemistry},
	volume = {43},
	number = {7},
	year = {2005},
	note = {ISI Document Delivery No.: 936FUTimes Cited: 0Cited Reference Count: 21},
	month = {Jul},
	pages = {520-527},
	type = {Article},
	abstract = {The dynamic CO exchange of the monovalent metal carbonyl cations [Ag((CO)-C-13)](+), [Au((CO)-C-13)(2)](+)-Au((CO)-C-13) SO3F and [Rh((CO)-C-12)(4-x)((CO)-C-13)(x)](+) (x <= 1) in superacidic solutions was studied by variable-temperature C-13 NMR methods. The exchange rates are strongly dependent on the acidity of the solvent, the concentration of metal carbonyl cations and temperature. Whereas a suitable exchange rate of the Ag(I) system is only accessible in magic acid (HSO3F-SbF5), the more stable Au(I) and Rh(I) systems were studied in the less acidic fluorosulfuric acid. Selected solutions of Ag(I), Rh(I) and Au(I) yielded activation barriers Delta G* of 42.7, 43.5, and 56.2 kJ mol(-1) respectively. Copyright (c) 2005 John Wiley \& Sons, Ltd.},
	keywords = {C-13 NMR, CO exchange, CRYSTAL, dynamic NMR, fluorosulfuric acid, GOLD, HINDERED INTERNAL ROTATION, HSO3F-SBF5, magic acid, metal carbonyl cations, NMR, NUCLEAR-MAGNETIC-RESONANCE, rhodium, silver, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {0749-1581},
	url = {<Go to ISI>://000229841700003},
	author = {von Ahsen, B. and Bach, C. and Balzer, G. and Bley, B. and Bodenbinder, M. and Hagele, G. and Willner, H. and Aubke, F.}
}
@article {1110,
	title = {Homoleptic, sigma-bonded octahedral superelectrophilic metal carbonyl cations of iron(II), ruthenium(II), and osmium(II). Part 2: Syntheses and characterizations of [M(CO)(6)][BF4](2) (M = Fe, Ru, Os)},
	journal = {Inorganic Chemistry},
	volume = {44},
	number = {12},
	year = {2005},
	note = {ISI Document Delivery No.: 934LPTimes Cited: 8Cited Reference Count: 51},
	month = {Jun},
	pages = {4206-4214},
	type = {Article},
	abstract = {As the first examples of homoleptic, sigma-bonded superelectrophilic metal carbonyl cations with tetrafluoroborate [BF4](-) as the counter anions three thermally stable salts of the composition [M(CO)(6)][BF4](2) (M = Fe, Ru, Os) have been synthesized and extensively characterized by thermochemical, structural, and spectroscopic methods. A common synthetic route, the oxidative carbonylation of either Fe(CO)(5) (XeF2 as the oxidizer) or M-3(CO)(12) (M = Ru, Os) (F-2 as the oxidizer) in the conjugate Bronsted-Lewis superacid HF/BF3, was employed. The thermal behavior of the three salts, studied by differential scanning calorimetry (DSC) and gas-phase IR spectroscopy of the decomposition products, has been compared to that of the corresponding [SbF6](-) salts. The molecular structures Of [M(CO)(6)][BF4](2) (M = Fe, Os) were obtained by single-crystal X-ray diffraction at 100 K. X-ray powder diffraction data for [M(CO)(6)][BF4](2) (M = Ru, Os) were obtained between 100 and 300 K in intervals of 50 K. All three salts are isostructural and crystallized in the tetragonal space group I4/m (No. 87). As for the corresponding [M(CO)(6)][SbF6](2) salts (M = Fe, Flu, Os), similar unit cell parameters and vibrational fundamentals were also found for the three [BF4](-) compounds. For the structurally characterized salts [M(CO)(6)][BF4](2) (M =. Fe, Os), very similar bond parameters for both cations and anions were found. Hence, the invariance of structural and spectroscopic properties Of [M(CO)(6)](2+) cations (M = Fe, Ru, Os) extended from the fluoroantimonates [Sb2F11](-) and [SbF6](-) as counteranions also to [BF4](-).},
	keywords = {ANTIMONY PENTAFLUORIDE, CHEMISTRY, GAS-PHASE, LEWIS-ACIDS, MAS-NMR-SPECTRA, MOLECULAR-STRUCTURE, SPECTROSCOPIC PROPERTIES, SYSTEM, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {0020-1669},
	url = {<Go to ISI>://000229710600022},
	author = {Finze, M. and Bernhardt, E. and Willner, H. and Lehmann, C. W. and Aubke, F.}
}
@article {571,
	title = {[Co(Co)(5)][(CF3)(3)BF]: A stable salt of a homoleptic trigonal-bipyramidal metal-carbonyl cation},
	journal = {Angewandte Chemie-International Edition},
	volume = {42},
	number = {18},
	year = {2003},
	note = {ISI Document Delivery No.: 681QPTimes Cited: 11Cited Reference Count: 34},
	pages = {2077-2079},
	type = {Article},
	keywords = {ACIDS, ANIONS, borates, carbonyl ligands, CO, cobalt complexes, MOLECULAR-STRUCTURE, RH, structure elucidation, superacids, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA, X-RAY-DIFFRACTION},
	isbn = {1433-7851},
	url = {<Go to ISI>://000183047100021},
	author = {Bernhardt, E. and Finze, M. and Willner, H. and Lehmann, C. W. and Aubke, F.}
}
@article {771,
	title = {Predominantly sigma-bonded metal carbonyl cations (sigma-carbonyls): New synthetic, structural, and bonding concepts in metal carbonyl chemistry},
	journal = {Chemistry-a European Journal},
	volume = {9},
	number = {8},
	year = {2003},
	note = {ISI Document Delivery No.: 669ZKTimes Cited: 7Cited Reference Count: 60},
	month = {Apr},
	pages = {1668-1676},
	type = {Article},
	abstract = {Predominantly sigma-bonded metal carbonyl cations (sigma-carbonyls) are conveniently generated in the Lewis superacid SbF5 or the conjugate Bronsted-Lewis superacid HF-SbF5, primarily by solvolytic or reductive carbonylations. Thermally stable salts are formed with the fluoroantimonate(v) ions [SbF6](-) and [Sb2F11](-). The salts are characterised by analytical, structural, spectroscopic and computational methods. Most homoleptic carbonyl cations have very regular geometries, comensurate with their d-electron configurations: linear (d(10)), square planar (d(8)) or octahedral(d(6)). The cations with metals in oxidation states of +2 or +3 are termed "superelectrophilic". Extended molecular structures form by significant interionic C-F contacts with electrophilic carbon as acceptor. To account for all experimental observations, a conceptually simple synergetic bonding model is proposed. An outlook at anticipated future developments based on very recent results is provided.},
	keywords = {<PT(CO)(4)><SB2F11>(2), carbonyl ligands, CATIONS, COMPLEXES, CRYSTAL, fluoro antimonates, FLUOROSULFATE, MOLECULAR-STRUCTURE, MONOXIDE, solid-state structures, superacidic systems, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS, X-RAY-DIFFRACTION},
	isbn = {0947-6539},
	url = {<Go to ISI>://000182381600002},
	author = {Willner, H. and Aubke, F.}
}
@article {770,
	title = {sigma-bonded metal carbonyl cations and their derivatives: Syntheses and structural, spectroscopic, and bonding principles},
	journal = {Organometallics},
	volume = {22},
	number = {18},
	year = {2003},
	note = {ISI Document Delivery No.: 716AGTimes Cited: 22Cited Reference Count: 150},
	month = {Sep},
	pages = {3612-3633},
	type = {Review},
	abstract = {Homoleptic sigma-bonded metal carbonyl cations (sigma-carbonyls) and their derivatives have grown in recent years into a large subgroup of mononuclear metal carbonyl complexes. They are at present formed by 17 elements, including the post transition metal mercury. Most are generated in superacids: the Lewis superacid SbF5 and the conjugate Bronsted-Lewis superacid HF-SbF5. Thermally stable salts are formed with the superacid anions [Sb2F11](-) and [SbF6](-). Many of the cations are superelectrophilic, with metals in oxidation states of +2 or +3. Three different synthetic routes are developed: reductive (A) or solvolytic carbonylations (B) and oxidative methods (C). Considerable progress has been made by replacing the Lewis superacid SbF5 as reaction medium by the conjugate Bronsted-Lewis superacid HF-SbF5. This allows reactions to proceed faster in a homogeneous phase and to produce crystalline materials. In total 27 mostly recent molecular structures have been obtained, including that of [Ir(CO)(6)] [SbF6](3)(.)4HF, the first HF solvate with one of the HF molecules coordinated in an isotridentate mode to three carbon atoms of the cation. Due to the electrophilic nature of the carbonyl carbon in fluoroantimonate salts of metal carbonyl cations, extended structures are formed via significant interionic C{\textendash}- F contacts. A new a-bonded carbonyl, (CF3)(3)BCO, which has been fully characterized, expands the existence range of metal carbonyl cations to group 13. The large amount of spectroscopic and structural information accumulated is used to present a conceptually simple bonding model.},
	keywords = {CONCENTRATED SULFURIC-ACID, DENSITY-FUNCTIONAL CALCULATION, EFFECTIVE IONIC-RADII, HSO3F-SBF5, LEWIS SUPERACID, MAS-NMR-SPECTRA, MOLECULAR-STRUCTURE, NUCLEAR-MAGNETIC-RESONANCE, VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS, X-RAY},
	isbn = {0276-7333},
	url = {<Go to ISI>://000185006200002},
	author = {Willner, H. and Aubke, F.}
}
@article {502,
	title = {Experimental and calculated molecular structures and high symmetry conformations of [Sb2F11](-) (D-4h) and 1,4-C4H4N2 center dot 2SbF(5) (D-2h)},
	journal = {Solid State Sciences},
	volume = {4},
	number = {11-12},
	year = {2002},
	note = {ISI Document Delivery No.: 634TJTimes Cited: 8Cited Reference Count: 52},
	month = {Nov-Dec},
	pages = {1457-1463},
	type = {Article},
	abstract = {Antimony(V) fluoride, SbF5, forms a molecular adduct with pyrazine (1,4-diazine) of the composition 1,4-C4H4N2.2SbF5. Its molecular structure is obtained by single crystal X-ray diffraction. Crystal data of pyrazine.2SbF(5): orthorhombic, spacegroup Pbca ($\#$ 61); a = 8.8052(8) Angstrom; b = 9.948(1) Angstrom; c = 12.297(2) Angstrom; V = 1077.1(2) Angstrom(3); Z = 4; T = 173(1) K; R-1(I > 3sigma (I)) = 0.031; wR(2) = 0.083. The Sb-F-4(eq) planes are eclipsed and the planar C4H4N2 ring is at a 45degrees angle to give D-2h symmetry for pyrazine.2SbF(5). A very similar high symmetry conformation of pointgroup D-4h is found for the [Sb2F11](-) anion in the metal carbonyl salts [Rh(CO)(4)][Sb2F11], [Au(CO)(2)][Sb2F11] and in [H3F2][Sb2F11]. Structural data for pyrazine.2SbF(5) and [Sb2F11](-) from [H3F2][Sb2F11], as well as vibrational data for [Sb2F11](-) (D-4h) are compared to calculated (DFT-B3LYP) data. According to the DFT calculations, the conformation for the[Sb2F11](-) anion (D-4h) and pyrazine.2SbF(5) (D-2h) are both eclipsed with respect to the SbF5-groups and eclipsed with respect to the pyrazine plane in pyrazine.2SbF(5) in their respective ground states. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.},
	keywords = {ADDUCTS, antimony(V) fluoride, CATIONS, CRYSTAL, F-19, fluoroantimonate anion, HEXACARBONYLS, high symmetry conformation, Lewis acid-base adducts, N-donor complex of antimony(V) fluoride, superacid anion, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {1293-2558},
	url = {<Go to ISI>://000180356800016},
	author = {Sham, I. H. T. and Patrick, B. O. and von Ahsen, B. and von Ahsen, S. and Willner, H. and Thompson, R. C. and Aubke, F.}
}
@article {502,
	title = {Experimental and calculated molecular structures and high symmetry conformations of [Sb2F11](-) (D-4h) and 1,4-C4H4N2 center dot 2SbF(5) (D-2h)},
	journal = {Solid State Sciences},
	volume = {4},
	number = {11-12},
	year = {2002},
	note = {ISI Document Delivery No.: 634TJTimes Cited: 8Cited Reference Count: 52},
	month = {Nov-Dec},
	pages = {1457-1463},
	type = {Article},
	abstract = {Antimony(V) fluoride, SbF5, forms a molecular adduct with pyrazine (1,4-diazine) of the composition 1,4-C4H4N2.2SbF5. Its molecular structure is obtained by single crystal X-ray diffraction. Crystal data of pyrazine.2SbF(5): orthorhombic, spacegroup Pbca ($\#$ 61); a = 8.8052(8) Angstrom; b = 9.948(1) Angstrom; c = 12.297(2) Angstrom; V = 1077.1(2) Angstrom(3); Z = 4; T = 173(1) K; R-1(I > 3sigma (I)) = 0.031; wR(2) = 0.083. The Sb-F-4(eq) planes are eclipsed and the planar C4H4N2 ring is at a 45degrees angle to give D-2h symmetry for pyrazine.2SbF(5). A very similar high symmetry conformation of pointgroup D-4h is found for the [Sb2F11](-) anion in the metal carbonyl salts [Rh(CO)(4)][Sb2F11], [Au(CO)(2)][Sb2F11] and in [H3F2][Sb2F11]. Structural data for pyrazine.2SbF(5) and [Sb2F11](-) from [H3F2][Sb2F11], as well as vibrational data for [Sb2F11](-) (D-4h) are compared to calculated (DFT-B3LYP) data. According to the DFT calculations, the conformation for the[Sb2F11](-) anion (D-4h) and pyrazine.2SbF(5) (D-2h) are both eclipsed with respect to the SbF5-groups and eclipsed with respect to the pyrazine plane in pyrazine.2SbF(5) in their respective ground states. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.},
	keywords = {ADDUCTS, antimony(V) fluoride, CATIONS, CRYSTAL, F-19, fluoroantimonate anion, HEXACARBONYLS, high symmetry conformation, Lewis acid-base adducts, N-donor complex of antimony(V) fluoride, superacid anion, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {1293-2558},
	url = {<Go to ISI>://000180356800016},
	author = {Sham, I. H. T. and Patrick, B. O. and von Ahsen, B. and von Ahsen, S. and Willner, H. and Thompson, R. C. and Aubke, F.}
}
@article {5088,
	title = {Molecular structure and conformation of peroxydisulfuryl difluoride, S2O6F2, as determined by gas-phase electron diffraction and ab initio molecular orbital calculations},
	journal = {Journal of Molecular Structure},
	volume = {567},
	year = {2001},
	note = {ISI Document Delivery No.: 454MBTimes Cited: 3Cited Reference Count: 22Sp. Iss. SI},
	month = {Jun},
	pages = {1-10},
	type = {Article},
	abstract = {The structure and conformational composition of peroxydisulfuryl difluoride, S2O6F2, have been investigated by gas-phase electron diffraction. Some of the results from ab initio molecular orbital calculations (MP2/6-311 + G*) were used as constraints in the analysis. There is both experimental and theoretical evidence that only conformers with a gauche X-OO-X torsion angle are present in the gaseous sample. Of these, only two conformers of symmetry C-2 (G(+)G(+) and G(-)G(-)) and one of symmetry C-1 (G(+)G(-)), where G(+/-) designates positive/negative rotation around the O-S bonds at either end of the molecule) were found to be plausible components of the gaseous mixture. In experiments at 298 K, about equally good fits were found with two models, model A consisting of a ratio of G(-)G(-)/G(+)G(+) equal to 57/43 (2 sigma = 27), and model B consisting of a ratio of G(-)G(-)/G(+)G(-) equal to 38/62 (2 sigma = 14). The composition of model A corresponds to DeltaG(0) = G(0)(G(+)G(+)) = G(0)(G(-)G(-)) = 0.17 (sigma = 0.24) kcal/mol, and that of model B to DeltaG(0) = G(0)(G(+) G(-)) - G(o)(G(-)G(-)) = -0.29 (sigma = 0.12). A system composed of only C2 symmetry conformers, such as model A, is favored by IR and Raman data, but our electron-diffraction results do not allow a choice. However, the bond lengths and bond angles for all conformers are similar so that, except for the torsion angles, the parameter values for the G-G- form are also reasonably close to those in the other forms. These distances (r(g) (Angstrom)) and angles (angle (alpha) (degrees)) values with 2 sigma uncertainties are r(S=O)= 1.406(2) Angstrom, r(S-F)= 1.539(3) Angstrom, r(O-S) = 1.620(4) Angstrom, r(O-O)=1.453(14) Angstrom, (angle (O-S=O))= 1/2[(O-S=O-4)+ angle (O-S=O-5)] = 107.2(12)degrees Delta angle (O-S=O)= angle (O-S=O-4) - angle (O-S=O-9)= 8.10 (assumed), angle (O-S-F)= 98.2(18)degrees, angle (O-O-S)= 108.6(10)degrees angle (O=S=O)= 126.7(15)degrees, and angle (S-O-O-S)= 122.7(56)degrees. (C) 2001 Elsevier Science B.V. All rights reserved.},
	keywords = {ab initio calculations, CLOSO2F, FOSO2F, molecular structure, PEROXIDE, peroxydisulfuryl difluoride, VIBRATIONAL-SPECTRA},
	isbn = {0022-2860},
	url = {<Go to ISI>://000169975400002},
	author = {Hagen, K. and Hedberg, K. and Gard, G. and Aubke, F.}
}
@article {5221,
	title = {Superelectrophilic tetrakis(carbonyl)palladium(II)- and -platinum(II) undecafluorodiantimonate(V), [Pd(CO)(4)][Sb2F11](2) and [Pt(CO)(4)][Sb2F11](2): Syntheses, physical and spectroscopic properties, their crystal, molecular, and extended structures, and},
	journal = {Journal of the American Chemical Society},
	volume = {123},
	number = {4},
	year = {2001},
	note = {ISI Document Delivery No.: 396RTTimes Cited: 30Cited Reference Count: 181},
	month = {Jan},
	pages = {588-602},
	type = {Review},
	abstract = {{The salts [M(CO)(4)][Sb2F11](2)},
	keywords = {ADJUSTED ABINITIO, basis sets, GOLD(III) FLUOROSULFATE, HEXAKIS(CARBONYL)IRON(II), INFRARED-SPECTRA, MAS-NMR-SPECTRA, METAL-CARBONYL CATIONS, PSEUDOPOTENTIALS, TRANSITION-ELEMENTS, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS},
	isbn = {0002-7863},
	url = {<Go to ISI>://000166650900009},
	author = {Willner, H. and Bodenbinder, M. and Brochler, R. and Hwang, G. and Rettig, S. J. and Trotter, J. and von Ahsen, B. and Westphal, U. and Jonas, V. and Thiel, W. and Aubke, F.}
}
@article {5221,
	title = {Superelectrophilic tetrakis(carbonyl)palladium(II)- and -platinum(II) undecafluorodiantimonate(V), [Pd(CO)(4)][Sb2F11](2) and [Pt(CO)(4)][Sb2F11](2): Syntheses, physical and spectroscopic properties, their crystal, molecular, and extended structures, and},
	journal = {Journal of the American Chemical Society},
	volume = {123},
	number = {4},
	year = {2001},
	note = {ISI Document Delivery No.: 396RTTimes Cited: 30Cited Reference Count: 181},
	month = {Jan},
	pages = {588-602},
	type = {Review},
	abstract = {{The salts [M(CO)(4)][Sb2F11](2)},
	keywords = {ADJUSTED ABINITIO, basis sets, GOLD(III) FLUOROSULFATE, HEXAKIS(CARBONYL)IRON(II), INFRARED-SPECTRA, MAS-NMR-SPECTRA, METAL-CARBONYL CATIONS, PSEUDOPOTENTIALS, TRANSITION-ELEMENTS, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS},
	isbn = {0002-7863},
	url = {<Go to ISI>://000166650900009},
	author = {Willner, H. and Bodenbinder, M. and Brochler, R. and Hwang, G. and Rettig, S. J. and Trotter, J. and von Ahsen, B. and Westphal, U. and Jonas, V. and Thiel, W. and Aubke, F.}
}
@article {4961,
	title = {{The reactions of the third transition series metal hexafluorides, MF6},
	journal = {Journal of Fluorine Chemistry},
	volume = {102},
	number = {1-2},
	year = {2000},
	note = {ISI Document Delivery No.: 302YMTimes Cited: 8Cited Reference Count: 77},
	month = {Mar},
	pages = {243-252},
	type = {Article},
	abstract = {{The reactions of the third transition (5d) series metal hexafluorides PtF6, IrF6, OsF6, ReF6 and WF6 with CO are studied in the Lewis superacid SbF5, the Bronsted superacid HF and the conjugate Bronsted-Lewis superacid HF-SbF5, in order to evaluate their potential as reactants in reductive carbonylations. These reactions are aimed at the generation of homoleptic metal carbonyl cations of the type [M(CO)(n)](m+)},
	keywords = {<IR(CO)(6)>(3+), carbonyl fluoride, CO, FLUOROSULFATES, HEXACARBONYLS, homoleptic carbonyl complexes, INCLUDING STEREOISOMERS, metal hexafluorides, MOLECULAR-STRUCTURE, NOBLE-METALS, PALLADIUM(II), platinum, superacid, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {0022-1139},
	url = {<Go to ISI>://000086394100033},
	author = {von Ahsen, B. and Bach, C. and Pernice, H. and Willner, H. and Aubke, F.}
}
@article {4473,
	title = {Hexakis(carbonyl)iron(II) undecafluorodiantimonate(V), [Fe(CO)(6)][Sb2F11](2), and -hexafluoroantimonate(V), [Fe(CO)(6)][SbF6](2), their syntheses, and spectroscopic and structural characterization by single crystal X-ray diffraction and normal coordinate},
	journal = {Journal of the American Chemical Society},
	volume = {121},
	number = {31},
	year = {1999},
	note = {ISI Document Delivery No.: 227UKTimes Cited: 32Cited Reference Count: 109},
	month = {Aug},
	pages = {7188-7200},
	type = {Review},
	abstract = {Hexakis/carbonyl iron(LI) undecafluorodiantimonate(V), [Fe(CO)(6)][Sb2F11](2) is conveniently prepared by the oxidative carbonylation of Fe(CO)(5) with XeF2 as external oxidizer in the conjugate Br phi nsted-Lewis superacid HF-SbF5. The colorless compound crystallizes from the reaction medium in high purity. The molecular structure is obtained by single-crystal X-ray diffraction. The cation is a regular octahedron, while the vertex-shared di-octahedral [Sb2F11](-) anion is distorted from D-4h symmetry by bending and rotational processes, due to significant interionic interactions, primarily of the FC type. Washing of [Fe(CO)(6)][Sb2F11](2) with anhydrous HF results in an unusual elution of SbF5 and the quantitative conversion to hexakis(carbonyl)iron(II) hexafluoroantimonate;(V) [Fe(CO)(6)][SbF6](2) The molecular structure of the salt shows octahedral ions with slight tetragonal distortions for the cation (elongation) and the anion (comprsssion). Both salts are thermally stable up to 150 degrees C, The averaged bond distances and the vibrational wavenumbers of [Fe(CO)(6)](2+) are nearly identical in both compounds. The [Fe(CO)(6)](2+) cation, the first and so far only isolated and structurally characterized dipositive, superelectrophilic carbonyl cation formed by a 3d-metal, is further characterized by a normal coordinate analysis (NCA). The obtained force constants are compared to those of the isoelectronic molecule Cr(CO)6. Changes in pi-back-bonding affect the F-CO/CO and F-CO/MC interaction force constants more strongly than the stretching force constants F-CO and F-MC All 13 fundamentals of [Fe(CO)(6)](2+) are detected and assigned with the help of the data obtained from the normal coordinate analysis and density functional calculations published previously. The electronic ground state (1)A(1g), of the [Fe(CO)(6)](2+) cation is established by magnetic susceptibility measurements of polycrystalline [Fe(CO)(6)][SbF6](2) and [Fe(CO)(6)][Sb2F11](2) between and 300 K. The magnetic impurity formed during synthesis is identified as Fe[SbF6](2) which has iron(II) in high spin (T-5(2g)) ground state. Consistent with a diamagnetic ground state are the single line in the Fe-57 Mossbauer spectrum (i.s. = -0.003(8) mm s(-1) relative to alpha-Fe), obtained on polycrystalline samples and the single sharp line in the C-13 NMR spectrum in DF solution at 178 ppm with J (Fe-57-C-13) of 19.2 Hz.},
	keywords = {C-13, COMPLEXES, CONSTANTS, IRON PENTACARBONYL, MAS-NMR-SPECTRA, METAL-CARBONYL CATIONS, MO, MOLECULAR-STRUCTURE, MONOXIDE, VIBRATIONAL-SPECTRA},
	isbn = {0002-7863},
	url = {<Go to ISI>://000082098200003},
	author = {Bernhardt, E. and Bley, B. and Wartchow, R. and Willner, H. and Bill, E. and Kuhn, P. and Sham, I. H. T. and Bodenbinder, M. and Brochler, R. and Aubke, F.}
}
@article {4159,
	title = {Homoleptic metal carbonyl cations of the electron-rich metals: Their generation in superacid media together with their spectroscopic and structural characterization},
	journal = {Angewandte Chemie-International Edition in English},
	volume = {36},
	number = {22},
	year = {1997},
	note = {ISI Document Delivery No.: YK253Times Cited: 18Cited Reference Count: 279},
	month = {Dec},
	pages = {2403-2425},
	type = {Review},
	keywords = {ANIONS, carbonyl complexes, CATIONS, CESIUM, FLUOROSULFATE, FLUOROSULFATE DERIVATIVES, GOLD(III), HEXAKIS(FLUOROSULFATO)ANTIMONATE(V), HIGHLY REDUCED ORGANOMETALLICS, MAS-NMR-SPECTRA, MOLECULAR-STRUCTURE, superacidic systems, synthetic methods, transition metals, TRANSITION-ELEMENTS, TRIFLUOROMETHYLATED, TRIS(PYRAZOLYL)BORATE, VIBRATIONAL-SPECTRA, WEAKLY COORDINATING},
	isbn = {0570-0833},
	url = {<Go to ISI>://A1997YK25300001},
	author = {Willner, H. and Aubke, F.}
}
@article {3785,
	title = {Density functional computations of the dipole moment derivatives for halogenated silanes},
	journal = {Theochem-Journal of Molecular Structure},
	volume = {363},
	number = {1},
	year = {1996},
	note = {ISI Document Delivery No.: UH856Times Cited: 1Cited Reference Count: 49},
	month = {Mar},
	pages = {115-124},
	type = {Article},
	abstract = {Electric dipole moments for the equilibrium molecular structures and their derivatives along the symmetry coordinates of vibration were computed for SiH2F2, SiD2F2, SiH2Cl2, SiD2Cl2, SiH3F, SiD3F, SiH3Cl, SiD3Cl, SiHF3, SiDF3, SiHCl3, SiDCl3, SIFCl3, SiF3Cl, SiF4 and SiCl4 by means of the deMon density functional program (A. St-Amant and D. R. Salahub, Chem. Phys. Lett., 169 (1990) 387). Satisfactory agreement was found between the experimental and computed dipole moments for the equilibrium molecular structures. Perfect agreement was found between the rotational corrections to the dipole moment derivatives calculated by deMon and those obtained independently from the orthogonality relationships between the symmetry coordinates and the rotational coordinates. Derivatives of the dipole moments were transformed into the representation of the normal coordinates of vibration and the results were compared with the experimental data which are available on the infrared intensities of fundamental bands.},
	keywords = {ABINITIO, density functional computations, DIPOLE MOMENT DERIVATIVES, GEOMETRIES, HALIDES, halogenated, METHANE, MICROWAVE-SPECTRA, MOLECULAR-STRUCTURES, QUADRUPOLE COUPLING-CONSTANTS, SILANES, SILYL, TRICHLOROSILANE, VIBRATIONAL-SPECTRA},
	isbn = {0166-1280},
	url = {<Go to ISI>://A1996UH85600010},
	author = {Papousek, D. and Papouskova, Z. and Chong, D. P.}
}
@article {3844,
	title = {Homoleptic carbonyl cations of palladium(I), palladium(II), platinum(II), and gold(I) - Simplified synthetic routes to their fluoroantimonate(V) salts},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {74},
	number = {11},
	year = {1996},
	note = {ISI Document Delivery No.: WC124Times Cited: 8Cited Reference Count: 68},
	month = {Nov},
	pages = {1952-1958},
	type = {Article},
	abstract = {{The original synthetic routes to the new noble metal carbonyl cations [Au(CO)(2)](+) and [M(CO)(4)](2+)},
	keywords = {ACIDS, and Pt(II), carbonylations in strong acidic media, COMPLEXES, DERIVATIVES, FLUOROSULFATES, MAS NMR-SPECTRA, metal carbonyl cations of Au(I), MONOXIDE, NOBLE-METALS, Pd(I), Pd(II), reactions in liquid SbF5, reductive carbonylation in liquid SbF5, solvolysis, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1996WC12400009},
	author = {Wang, C. Q. and Siu, S. C. and Hwang, G. and Bach, C. and Bley, B. and Bodenbinder, M. and Willner, H. and Aubke, F.}
}
@article {3842,
	title = {Solvolysis reactions in liquid antimony (V) fluoride. A convenient and versatile synthetic method},
	journal = {European Journal of Solid State and Inorganic Chemistry},
	volume = {33},
	number = {9},
	year = {1996},
	note = {ISI Document Delivery No.: VK527Times Cited: 9Cited Reference Count: 71},
	pages = {917-930},
	type = {Article},
	abstract = {{Solvolysis reactions of various fluorosulfates in liquid antimony (V) fluoride allow the synthesis of a wide range of fluoroantimonate (V) salts with main group, organometallic and transition metal cations. In the presence of carbon monoxide, CO, at pressures of 0.5 to 2.0 atmospheres a new group of homoleptic carbonyl cations of electronrich metals (Hg, Au, Pt, Pd, Ir, Ru, and Os) form with [Sb2F11](-) as anion. The salts show relatively high thermal stability (> 100 degrees C). The geometries of the cations [Au(CO)(2)](+), [Hg(CO)(2)](2+) (linear) and [M(CO)(4)](2+)},
	keywords = {CATIONS, CRYSTAL, FLUOROSULFATES, MAGNETIC-PROPERTIES, MAS NMR-SPECTRA, MOLECULAR-STRUCTURE, NOBLE-METALS, TRIS(FLUOROSULFATE), UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {0992-4361},
	url = {<Go to ISI>://A1996VK52700012},
	author = {Wang, C. and Hwang, G. and Siu, S. C. and Aubke, F. and Bley, B. and Bodenbinder, M. and Bach, C. and Willner, H.}
}
@article {3866,
	title = {Superacid anions: Crystal and molecular structures of oxonium undecafluorodiantimonate(V), [H3O][Sb2F11], cesium fluorosulfate, CsSO3F, cesium hydrogen bis(fluorosulfate), Cs[H(SO3F)(2)], cesium tetrakis(fluorosulfato)aurate(III), Cs[Au(SO3F)(4)], cesium},
	journal = {Inorganic Chemistry},
	volume = {35},
	number = {21},
	year = {1996},
	note = {ISI Document Delivery No.: VL611Times Cited: 31Cited Reference Count: 90},
	month = {Oct},
	pages = {6113-6130},
	type = {Article},
	abstract = {{In order to understand the reasons for the low nucleophilicity of superacid anions, a systematic, comparative study of six superacid anions by single-crystal X-ray diffraction is undertaken. From magic acid, HSO3F-SbF5, surprisingly, single crystals of oxonium undecafluorodiantimonate(V), [H3O][Sb2F11], 1, are obtained. In the remaining five salts the cesium ion, Cs+, is used as the countercation. Both CsSO3F, 2, and its solvate Cs[H(SO3F)(2)], 3, are derived from the Bronsted superacid HSO3F. The conjugate noble metal superacid systems HSO3F-Au(SO3F)(3) and HSO3F-Pt(SO3F)(4) provide cesium tetrakis(fluorosulfato)aurate(III) Cs[Au(SO3F)(4)], 4, and cesium hexakis (fluorosulfato)platinate(IV) Cs-2[Pt(SO3F)(6)], 5. Cesium hexakis (fluorosulfato)antimonate(V) Cs[Sb(SO3F)(6)], 6, whose synthesis is described here in detail, provides evidence for the possible existence of a new conjugate superacid system, HSO3F-Sb(SO3F)(5). Crystals of [H3O][Sb2F11] (1, H3F11OSb2) are orthorhombic},
	keywords = {ACIDS, BEHAVIOR, CATIONS, CONSTANTS, DERIVATIVES, FLUORIDE, FLUOROSULFATE, GOLD(III), TRIS(FLUOROSULFATE), VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1996VL61100024},
	author = {Zhang, D. L. and Rettig, S. J. and Trotter, J. and Aubke, F.}
}
@article {3866,
	title = {Superacid anions: Crystal and molecular structures of oxonium undecafluorodiantimonate(V), [H3O][Sb2F11], cesium fluorosulfate, CsSO3F, cesium hydrogen bis(fluorosulfate), Cs[H(SO3F)(2)], cesium tetrakis(fluorosulfato)aurate(III), Cs[Au(SO3F)(4)], cesium},
	journal = {Inorganic Chemistry},
	volume = {35},
	number = {21},
	year = {1996},
	note = {ISI Document Delivery No.: VL611Times Cited: 31Cited Reference Count: 90},
	month = {Oct},
	pages = {6113-6130},
	type = {Article},
	abstract = {{In order to understand the reasons for the low nucleophilicity of superacid anions, a systematic, comparative study of six superacid anions by single-crystal X-ray diffraction is undertaken. From magic acid, HSO3F-SbF5, surprisingly, single crystals of oxonium undecafluorodiantimonate(V), [H3O][Sb2F11], 1, are obtained. In the remaining five salts the cesium ion, Cs+, is used as the countercation. Both CsSO3F, 2, and its solvate Cs[H(SO3F)(2)], 3, are derived from the Bronsted superacid HSO3F. The conjugate noble metal superacid systems HSO3F-Au(SO3F)(3) and HSO3F-Pt(SO3F)(4) provide cesium tetrakis(fluorosulfato)aurate(III) Cs[Au(SO3F)(4)], 4, and cesium hexakis (fluorosulfato)platinate(IV) Cs-2[Pt(SO3F)(6)], 5. Cesium hexakis (fluorosulfato)antimonate(V) Cs[Sb(SO3F)(6)], 6, whose synthesis is described here in detail, provides evidence for the possible existence of a new conjugate superacid system, HSO3F-Sb(SO3F)(5). Crystals of [H3O][Sb2F11] (1, H3F11OSb2) are orthorhombic},
	keywords = {ACIDS, BEHAVIOR, CATIONS, CONSTANTS, DERIVATIVES, FLUORIDE, FLUOROSULFATE, GOLD(III), TRIS(FLUOROSULFATE), VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1996VL61100024},
	author = {Zhang, D. L. and Rettig, S. J. and Trotter, J. and Aubke, F.}
}
@article {2956,
	title = {CARBON-MONOXIDE AS A SIGMA-DONOR LIGAND IN COORDINATION CHEMISTRY},
	journal = {Coordination Chemistry Reviews},
	volume = {137},
	year = {1994},
	note = {ISI Document Delivery No.: PW818Times Cited: 84Cited Reference Count: 189},
	month = {Dec},
	pages = {483-524},
	type = {Review},
	abstract = {In addition to the numerous and varied examples of organometallic and coordination compounds where carbon monoxide functions as a pi-acceptor ligand, there is a small but select group of derivatives where the CO-metal bonding relies predominantly on a-bonding only. The metal derivatives, which include Pt(CO)(2)Cl-2 known since 1868, are formed by electron-rich metals (Pd, Pt, Ag and Au), in oxidation states +1 and +2, are cationic in nature, and are for the most part thermally stable. Their generation in strong protonic and Lewis acids (HSO3F, HSO3F-SbF5 and liquid SbF5) allows convenient synthesis. The predominance of sigma-bonding results in unusual spectroscopic properties, such as <(nu)over bar>CO stretching vibrations as high as 2280 cm(-1), relative to 2143 cm(-1) in free CO, and C-13 chemical shifts which are 180-130 ppm rather than 190-220 ppm for classical transition-metal carbonyls. Consequently two basic principles, the synergic bonding model and the rule of 18, fail for these complexes. Recent structural studies point to the importance of secondary OC...OS or OC...FSb contacts, which in place of pi-backdonation provide for a measure of charge compensation both in solution or in the solid state. This review concentrates on very recent (since 1990) developments in this field, which is expanding rapidly beyond the transition metals.},
	keywords = {FLUOROSULFATE DERIVATIVES, GOLD(III) FLUOROSULFATE, HIGHLY REDUCED ORGANOMETALLICS, LATE TRANSITION-ELEMENTS, MAGNETIC-PROPERTIES, MICROWAVE-SPECTRUM, MOLECULAR-STRUCTURE, NOBLE-METALS, THIONYL CHLORIDE, VIBRATIONAL-SPECTRA},
	isbn = {0010-8545},
	url = {<Go to ISI>://A1994PW81800013},
	author = {Aubke, F. and Wang, C.}
}
