JACS: 103Rh CPMAS NMR

J. Am. Chem. Soc., ASAP Article 10.1021/ja057347s S0002-7863(05)07347-6
Web Release Date: March 2, 2006

Observation of Solid-State 103Rh NMR by Cross-Polarization

Brian L. Phillips,* Jacqueline R. Houston, Jian Feng, and William H. Casey

Center for Environmental Molecular Science, Departments of Geosciences and Chemistry, State University of New York, Stony Brook, New York 11794, and Department of Chemistry, University of California, Davis, California 95616

Abstract:

Using 103Rh[1H] cross-polarization (CP) methods, we have obtained solid-state 103Rh NMR spectra for diamagnetic Rh(III) compounds. The isotropic chemical shift and chemical shift anisotropy (CSA) are reported for a crystalline form of the dihydroxy-bridged Rh(III) dimer and for a salt of the oxo-centered acetate-bridged Rh(III) trimer, from analysis of conventional CP/MAS spectra. Comparison of the CP kinetics of the dimer with new crystal structure data suggests a strategy for predicting 103Rh CP/MAS properties in solids.