@article {4865, title = {Synthesis, structure and magnetic properties of a chromium(III)-nicotinamide complex [Cr3O(O2CCH3)(6)(na)(3)](+) (na = nicotinamide)}, journal = {Inorganica Chimica Acta}, volume = {297}, number = {1-2}, year = {2000}, note = {ISI Document Delivery No.: 277TNTimes Cited: 16Cited Reference Count: 20}, month = {Jan}, pages = {1-5}, type = {Article}, abstract = {The reaction between [Cr3O(O2CCH3)(7)(H2O)] ({\textquoteright}basic chromium acetate{\textquoteright}) and an excess of nicotinamide (na) at 120 degrees C, followed by dissolution of the mixture in water and addition of PF6-, led to the isolation of the first Cr(III)-nicotinamide complex [Cr3O(O2CCH3)(6)(na)(3)](+) (1). Crystals of the compound 1 . PF6. 3CH(3)CN were subjected to a detailed X-ray structural analysis. The three N-bonded na ligands, which occupy axial positions at the corners of the triangular basic chromium acetate, are nearly co-planar with the Cr3O system. The three Cr-N(na) bond distances are in the range 2.121(8)-2.128(8) Angstrom. Two of the na ligands on each cluster form four hydrogen bonds with two ligands from a neighboring cluster, via their amide ends with N...O distances of 2.88(1)-2.92(1) Angstrom. Magnetic susceptibility measurements of a powdered sample of 1 . PF6. 3CH(3)CN over the range 2-300 K showed that the three Cr(III) ions were antiferromagnetically coupled with J -10.4 cm(-1). There was no evidence for intermolecular magnetic exchange between the two Cr3O centers which are connected via hydrogen bonds. (C) 2000 Elsevier Science S.A. All rights reserved.}, keywords = {CHROMIUM, CHROMIUM COMPLEXES, crystal structures, GLUCOSE-TOLERANCE FACTOR, MAGNETIC PROPERTIES, nicotinamide complexes}, isbn = {0020-1693}, url = {://000084949800002}, author = {Lieberman, R. L. and Bino, A. and Mirsky, N. and Summers, D. A. and Thompson, R. C.} }