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Published 1977 | public
Journal Article

Carbon-13 and Nitrogen-15 Spin-Lattice Relaxation in Cyanide Ion and Hydrogen Cyanide

Abstract

Carbon-13 and nitrogen-15 spin-lattice relaxation for cyanide ion in aqueous solution appears to be a complex process with contributions from spin rotation, scalar relaxation, and chemical-shift anisotropy, as well as an appreciable concentration dependence, although the nature of the counterion seems unimportant. Carbon relaxation in cyanide ion is insensitive to pH from pH 8 to 12. Measurements at different temperatures and field strengths indicate that for ^(13)C, chemical-shift anisotropy and spin anisotropy and spin rotation are the dominant modes of relaxation. The contribution of ^(14)N quadrupole-induced carbon relaxation bas been determined by comparing ordinary cyanide with nitrogen-15 labeled cyanide. The degree of dipolar relaxation has been found to be small for hydrogen cyanide nitrogen-15 relaxation also appears to have an important contribution from the chemical-shift anisotropy of cyanide ions.

Additional Information

© 1977 Centre national de la recherche scientifique. Received December 20. 1976. We would like to thank Dr. R. O. Duthaler for data on the ^(15)N relaxation time of quinuclidine. Supported by tbe Public Health Service, Research Grant No. GM-11072, from the Division of General Medical Sciences, and by the National Science Foundation.

Additional details

Created:
August 19, 2023
Modified:
October 25, 2023