Direct determination of J coupling between two crystallographically equivalent spins from two-dimensional J-resolved nuclear magnetic resonance spectra under variable-angle-spinning conditions

Wu, Gang; Wasylishen, Roderick E.
April 1994
Journal of Chemical Physics;4/15/1994, Vol. 100 Issue 8, p5546
Academic Journal
We describe a new solid-state nuclear magnetic resonance (NMR) method for directly measuring the indirect spin–spin coupling J between two crystallographically equivalent, but magnetically nonequivalent spins. We show that under conditions of fast variable-angle-spinning (VAS), two-dimensional (2D) J-resolved NMR spectra can yield an accurate value of the J coupling between a pair of crystallographically equivalent spins. This information is not available from fast magic-angle-spinning (MAS) NMR spectra, or from NMR spectra of isotropic fluids unless a third spin is introduced into the spin system. Furthermore, the observation of J in VAS 2D J-resolved experiments does not rely on the presence of a nonzero dipolar coupling between the equivalent spins. This contrasts with slow-spinning MAS experiments involving crystallographically equivalent spin pairs, where recoupling of the J interaction requires that the two nuclei are also dipolar coupled.


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