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Cr-53 Nuclear Magnetic Resonance Studies of Solid Prototypal Chromium Compounds


EMSL Project ID
2314

Abstract

Chromium is an important transition metal, having found applications ranging from asymmetric catalysis to molecular magnetism and superconductivity. To date, no 53Cr solid-state nuclear magnetic resonance spectra of diamagnetic chromium compounds have been reported in the literature. Isotropic chromium chemical shifts and line widths for fewer than one hundred compounds in solution are known. The lack of NMR data for chromium is surely due to the poor sensitivity and large quadrupole moment associated with the 53Cr nucleus (I = 3/2; N.A. = 9.55 %; X = 5.64 MHz; Q = -0.15 barn). A high external applied magnetic field is essential to contend with these properties. Solid-state 53Cr NMR spectroscopy will be applied to several prototypal diamagnetic chromium compounds of high symmetry, with the goal of characterizing the chromium electric field gradient (EFG) and chemical shift (CS) tensors. Specifically, we intend to acquire and interpret the first 53Cr spectra of MAS and stationary samples for several hexacoordinate Cr(0) and tetracoordinate Cr(VI) chromium compounds. In addition to providing some of the first fundamental information on chromium NMR interaction tensors, this research will also complement our ongoing NMR studies of 95Mo, another quadrupolar nucleus of group 6.

Project Details

Project type
Capability Research
Start Date
2001-10-01
End Date
2002-12-09
Status
Closed

Team

Principal Investigator

David Bryce
Institution
University of Ottawa

Team Members

Roderick Wasylishen
Institution
University of Alberta

Michelle Forgeron
Institution
University of Alberta