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Cross-Correlated Quadrupolar Spin Relaxation and Carbon-13 Lineshapes in the 13CD2 Spin Grouping

✍ Scribed by L.G. Werbelow; G.A. Morris; P. Kumar; J. Kowalewski

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 104 KB
Volume: 140
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1999.1792

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✦ Synopsis

Lineshape calculations are reported for a spin system consisting of a spin-1 2 nucleus scalar-coupled to two magnetically equivalent spin-1 nuclei, e.g., a CD 2 group. It is found that, because of the differential line broadening, the peak height ratio of the five spin-1 2 nucleus transitions is expected to deviate from the integrated intensity ratio of 1:2:3:2:1. The deviation is dependent on the extent of cross-correlation between the two quadrupolar interactions. The theoretical predictions for peak height ratios and for bandshapes are tested for the carbon-13 spectrum of perdeuterated ethylene glycol, and iterative fitting is used to obtain an estimate of the extent of the correlation between the quadrupolar interactions for the two deuterons.

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