@article {4998,
	title = {Organometallic oxides: Oxidation of the cubane [(eta-C5R5)Cr(mu(3)-O)](4) and the structures and magnetic properties of the salts {[(eta-C5R5)Cr(mu(3)-O)](4)}{tcnq} and {[(eta-C5R5)Cr(mu(3)-O)](4)}{BF4},
	journal = {Organometallics},
	volume = {20},
	number = {9},
	year = {2001},
	note = {ISI Document Delivery No.: 428DKTimes Cited: 5Cited Reference Count: 41},
	month = {Apr},
	pages = {1840-1848},
	type = {Article},
	abstract = {Differential pulse and current voltammetry for the cubane-like clusters [(eta -C5R5)Cr(mu (3)-O)](4) (R = H, Me; R-5 = H4Me) showed that [(eta -C5H4Me)Cr(mu (3)-O)](4) and [(eta -C5Me5)Cr(mu (3)-O)](4) were oxidized to {[(eta -C5R5)Cr(mu (3)-O)](4)}(+) and then to {[(eta -C5R5)Cr(mu (3)-O)](4)}(2+), but [(eta -C5H5)-Cr(mu (3)-O)](4) was oxidized only to {[(eta -C5H5)Cr(mu (3)-O)](4)}(+). Oxidation of [(eta -C5Me5)Cr(mu (3)-O)](4) (1) by AgBF4 or tcnq gave {[(eta -C5Me5)Cr(mu (3)-O)](4)}{BF4} (2) {[(eta -C5Me5)Cr(mu (3)-O)](4)}{tcnq} (3). It was shown by X-ray diffraction that the average Cr-Cr, Cr-O, and Cr-Cp* distances in 2 and 3 were 0.034(2), 0.007(5), and 0.02(1) Angstrom shorter than those in 1, respectively. Compounds 1 2, and 3 were antiferromagnetic., with similar intracluster exchange coupling constants, J (-262(23), -211(34), and -266(46) cm(-1), respectively). There was coupling between unpaired electrons on {[(eta -C5Me5)Cr(mu (3)-O)](4)}(+) and {tcnq}(-) in 3 at temperatures below 110 Ii.},
	keywords = {<(ETA-C5H5)CR(MU-3-O)>4, CLUSTERS, COMPLEXES, CRYSTAL-STRUCTURES, MONONUCLEAR, REACTIVITY, SINGLE-MOLECULE MAGNETS, TCNQ, X-ray structure},
	isbn = {0276-7333},
	url = {<Go to ISI>://000168445800017},
	author = {Allen, D. P. and Bottomley, F. and Day, R. W. and Decken, A. and Sanchez, V. and Summers, D. A. and Thompson, R. C.}
}
@article {4541,
	title = {Chemistry of the Ag-2(dmb)(2)(2+) template (dmb=1,8-diisocyano-p-menthane). Preparation, characterization, and x-ray structures of the Ag-2(dmb)(2)Y-2 dimers (Y = NO3-, ClO4-, CH3CO2-) and the paramagnetic [Ag-4(dmb)(4)(TCNQ)(3)]TCNQ complex (TCNQ=7,7,8,8},
	journal = {Inorganic Chemistry},
	volume = {38},
	number = {6},
	year = {1999},
	note = {ISI Document Delivery No.: 180DKTimes Cited: 17Cited Reference Count: 43},
	month = {Mar},
	pages = {1253-1260},
	type = {Article},
	abstract = {{Direct reactions of the AgY salts with dmb (1,8-diisocyano-p-menthane) in a 1:1 stoichiometric amount generate the binuclear Ag-2(dmb)(2)Y-2 complexes. The X-ray crystallography establishes that the structure consists of two Ag+ atoms bridged by two dmb ligands forming a 20-membered ring and by two counteranions via one of the O-atoms, forming a four-membered ring (local symmetry D-2h) The Ag-I... Ag-I separations are 3.909(1) and 3.6831(8) Angstrom for Y = NO3- and CH3CO2-, respectively. Reactions of Ag-2(dmb)(2)Y-2 (Y = NO3-, ClO4-) with LiTCNQ lead to the paramagnetic tetranuclear species [Ag-4(dmb)(4)(TCNQ)(3)]TCNQ. The structure at 180 K consists of two Ag-2(dmb)(2)(2+) species (d(Ag ... Ag) = 4.113(1) Angstrom held together by three parallel TCNQ(-{\textquoteright})s, with Ag+... N=C distances ranging from 2.359(5) to 2.787(5) Angstrom. Two of the Ag+ atoms are tricoordinated, and the other two are tetracoordinated placed within in a centrosymmetric geometry. The three bridging TCNQ-{\textquoteright}s exhibit interplanar distances of 3.333(1) Angstrom, and the Ag-4 species are packed side-by-side with two adjacent TCNQ-{\textquoteright}s face-to-face (separation 3.372(1) Angstrom) forming an infinite pi-stacked chain TCNQ(-{\textquoteright})s. The TCNQ(-) counteranion also exhibits weak pi-contacts via the -CN groups with other counteranions. The magnetic susceptibilities, EPR spectra, and unit cell parameters have been measured as a function of temperature. The magnetic data are best explained by extended chains of anti Ferromagnetically coupled S = 3/2 and S = 1/2 centers for the [Ag-4(dmb)(4)-(TCNQ)(3)](+) and TCNQ(-) moieties, respectively. No hyperfine structure has been observed between 106 and 290 K, indicating the presence of rapid exchange in the paramagnetic system. Crystal data: Ag-2(dmb)(2)(NO3)(2), crystal system, orthorhombic, space group = C-cmb},
	keywords = {1, 7, 7{\textquoteright}, 8, 8-DIISOCYANO-P-MENTHANE, 8-TETRACYANOQUINODIMETHANE, 8{\textquoteright}-TETRACYANOQUINODIMETHANE, CRYSTAL-STRUCTURE, MAGNETIC-PROPERTIES, NICKEL(II), POLYMERS, SPECTROSCOPY, SYSTEMS, TCNQ},
	isbn = {0020-1669},
	url = {<Go to ISI>://000079370000030},
	author = {Fortin, D. and Drouin, M. and Harvey, P. D. and Herring, F. G. and Summers, D. A. and Thompson, R. C.}
}
@article {4541,
	title = {Chemistry of the Ag-2(dmb)(2)(2+) template (dmb=1,8-diisocyano-p-menthane). Preparation, characterization, and x-ray structures of the Ag-2(dmb)(2)Y-2 dimers (Y = NO3-, ClO4-, CH3CO2-) and the paramagnetic [Ag-4(dmb)(4)(TCNQ)(3)]TCNQ complex (TCNQ=7,7,8,8},
	journal = {Inorganic Chemistry},
	volume = {38},
	number = {6},
	year = {1999},
	note = {ISI Document Delivery No.: 180DKTimes Cited: 17Cited Reference Count: 43},
	month = {Mar},
	pages = {1253-1260},
	type = {Article},
	abstract = {{Direct reactions of the AgY salts with dmb (1,8-diisocyano-p-menthane) in a 1:1 stoichiometric amount generate the binuclear Ag-2(dmb)(2)Y-2 complexes. The X-ray crystallography establishes that the structure consists of two Ag+ atoms bridged by two dmb ligands forming a 20-membered ring and by two counteranions via one of the O-atoms, forming a four-membered ring (local symmetry D-2h) The Ag-I... Ag-I separations are 3.909(1) and 3.6831(8) Angstrom for Y = NO3- and CH3CO2-, respectively. Reactions of Ag-2(dmb)(2)Y-2 (Y = NO3-, ClO4-) with LiTCNQ lead to the paramagnetic tetranuclear species [Ag-4(dmb)(4)(TCNQ)(3)]TCNQ. The structure at 180 K consists of two Ag-2(dmb)(2)(2+) species (d(Ag ... Ag) = 4.113(1) Angstrom held together by three parallel TCNQ(-{\textquoteright})s, with Ag+... N=C distances ranging from 2.359(5) to 2.787(5) Angstrom. Two of the Ag+ atoms are tricoordinated, and the other two are tetracoordinated placed within in a centrosymmetric geometry. The three bridging TCNQ-{\textquoteright}s exhibit interplanar distances of 3.333(1) Angstrom, and the Ag-4 species are packed side-by-side with two adjacent TCNQ-{\textquoteright}s face-to-face (separation 3.372(1) Angstrom) forming an infinite pi-stacked chain TCNQ(-{\textquoteright})s. The TCNQ(-) counteranion also exhibits weak pi-contacts via the -CN groups with other counteranions. The magnetic susceptibilities, EPR spectra, and unit cell parameters have been measured as a function of temperature. The magnetic data are best explained by extended chains of anti Ferromagnetically coupled S = 3/2 and S = 1/2 centers for the [Ag-4(dmb)(4)-(TCNQ)(3)](+) and TCNQ(-) moieties, respectively. No hyperfine structure has been observed between 106 and 290 K, indicating the presence of rapid exchange in the paramagnetic system. Crystal data: Ag-2(dmb)(2)(NO3)(2), crystal system, orthorhombic, space group = C-cmb},
	keywords = {1, 7, 7{\textquoteright}, 8, 8-DIISOCYANO-P-MENTHANE, 8-TETRACYANOQUINODIMETHANE, 8{\textquoteright}-TETRACYANOQUINODIMETHANE, CRYSTAL-STRUCTURE, MAGNETIC-PROPERTIES, NICKEL(II), POLYMERS, SPECTROSCOPY, SYSTEMS, TCNQ},
	isbn = {0020-1669},
	url = {<Go to ISI>://000079370000030},
	author = {Fortin, D. and Drouin, M. and Harvey, P. D. and Herring, F. G. and Summers, D. A. and Thompson, R. C.}
}
