Harbison`s STREAQI for large quadrupolar interactions

Journal of Magnetic Resonance
Volume 186, Issue 2, June 2007, Pages 347-351
doi:10.1016/j.jmr.2007.03.002

Slow turning reveals enormous quadrupolar interactions (STREAQI)

John Persons and Gerard S. Harbison
Department of Chemistry, University of Nebraska at Lincoln, Lincoln, NE 68588-0304, USA
Received 18 December 2006; revised 1 March 2007. Available online 12 March 2007.

Abstract

We introduce a new solid-state NMR method, which uses very slow sample rotation to visualize NMR spectra whose width exceeds feasible spectrometer bandwidths. It is based on the idea that if we reorient a tensor by a known angle about a known axis, the shifts in the NMR frequencies observed across the spectral width allow us to reconstruct the entire tensor. Called STREAQI (Slow Turning Reveals Enormous Anisotropic Quadrupolar Interactions), this method allows us to probe NMR nuclei that are intractable to current methods. To prove the concept and demonstrate its promise we have implemented the method for several 79Br containing samples with quadrupolar coupling constants in the range of 10–50 MHz.

Keywords: Quadrupolar interactions; Sample rotation; NMR; Bromine-79