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Synthesis, structure and magnetic properties of a chromium(III)-nicotinamide complex [Cr3O(O2CCH3)(6)(na)(3)](+) (na = nicotinamide)

TitleSynthesis, structure and magnetic properties of a chromium(III)-nicotinamide complex [Cr3O(O2CCH3)(6)(na)(3)](+) (na = nicotinamide)
Publication TypeJournal Article
Year of Publication2000
AuthorsLieberman, RL, Bino, A, Mirsky, N, Summers, DA, Thompson, RC
JournalInorganica Chimica Acta
Volume297
Pagination1-5
Date PublishedJan
Type of ArticleArticle
ISBN Number0020-1693
KeywordsCHROMIUM, CHROMIUM COMPLEXES, crystal structures, GLUCOSE-TOLERANCE FACTOR, MAGNETIC PROPERTIES, nicotinamide complexes
Abstract

The reaction between [Cr3O(O2CCH3)(7)(H2O)] (’basic chromium acetate’) 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.

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