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1. Halogen Oxidation Reactions of (C5Ph5)Cr(CO)3 and Lewis Base Addition to [(C5Ph5)Cr(μ-X)X]2: Electrochemical, Magnetic, and Raman Spectroscopic Characterization of [(C5Ph5)CrX2]2 and (C5Ph5)CrX2(THF) (X = Cl, Br, I) and X-ray Crystal Structure of [(C5Ph5)Cr(μ-Cl)Cl]2

Author

Brenda J. Korte, James C. Durham, Roger D. Sommer, Brett E. Harris, Michael P. Castellani, Robert W. Grady, Arnold L. Rheingold, Carter S. Jarrell, J. Matthew Mooney, J. Matthew Boggess, Roman S. Czernuszewicz, Marc A. Hutton, Gordon T. Yee, and Ulrich Kölle

Subjects
Dimer, Organic Chemistry, Inorganic chemistry, Crystal structure, Electrochemistry, Inorganic Chemistry, Metal, symbols.namesake, Crystallography, chemistry.chemical_compound, chemistry, visual_art, Halogen, visual_art.visual_art_medium, symbols, Lewis acids and bases, Physical and Theoretical Chemistry, Raman spectroscopy, Tetrahydrofuran
Abstract

The 17-electron complex (C5Ph5)Cr(CO)3 reacts with halogens (C6H5I·Cl2, Br2, and I2) in C6H6 to yield the dimeric oxidation products [(C5Ph5)Cr(μ-X)X]2 as thermally stable solids. Reactions with other chlorinating agents similarly yield [(C5Ph5)CrCl2]2. An X-ray crystal structure of [(C5Ph5)Cr(μ-Cl)Cl]2 was obtained. The magnetic properties of the Cl2-bridged dimer have been determined and modeled using the usual isotropic Hamiltonian H = −2JŜ1·Ŝ2, which yields J/k = −30 K. Low-temperature (77 K) Raman spectra of solid [(C5Ph5)CrX2]2 (X = Cl, I) allow assignments to be made for the metal-ring and metal halogen stretching modes in the low-frequency region (

Published
2001
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