2ND-ORDER QUADRUPOLAR EFFECTS ON NMR-SPECTRA OF SPIN-1/2 NUCLEI IN SOLIDS, TRANSMITTED BY DIPOLAR COUPLING - COMPOUNDS CONTAINING MN-55(S = 5/2), CO-59(S = 7/2), AND NB-93(S = 9/2)

The theory for second-order quadrupolar effects on the centerband for magic-anglespinning solid-state NMR spectra of spin-2 nuclei dipolar-coupled to a quadrupolar nucleus is summarized. Experimental examples are presented for 31P bonded to 55Mn, 59Co, and 93b in seven compounds. The information content is discussed, especially for the case where the three tensors involved are axially symmetric and are coaxial. Spinning-sideband patterns are used to expand the data obtained. Isotropic coupling constants and isotropic chemical shifts are presented, together with additional tensor information where the analysis permits. © 1992.