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Cross-Correlation Effects Involving Curie Spin Relaxation in Methyl Groups

✍ Scribed by P.K. Madhu; Pravat K. Mandal; Norbert Müller

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 176 KB
Volume: 155
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.2001.2496

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✦ Synopsis

Cross-correlation effects arising in methyl protons due to the simultaneous presence of dipole-dipole, chemical shift anisotropy, and Curie spin relaxation mechanisms in paramagnetic systems are analyzed. We assess the potential of obtaining structural constraints from the cross-correlation of Curie spin relaxation with dipolar relaxation mechanisms among methyl proton spins. By theoretical analysis and numerical simulations we characterize the transfer functions describing the interconversion processes of different ranks of multispin order. The time dependence of these processes contains a new type of structural information, the orientation of the methyl C 3 -axis with respect to the electron center. Experimental confirmation is found for selected methyl groups in low spin Fe 3+ sperm whale myoglobin.

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