Title

Spin-Lattice Relaxation in Triphenylphospine, Triphenylarsine, and Triphenylstine

Document Type

Article

Language

eng

Publication Date

4-1978

Publisher

American Chemical Society

Source Publication

Journal of the American Chemical Society

Source ISSN

0002-7863

Abstract

The spin-lattice relaxation times (T1) have been determined for all carbons in triphenylphosphine, triphenylarsine, and triphenylstibine. The ortho, meta, and para carbons all relax exclusively by the dipole-dipole mechanism. The α carbons in triphenylphosphine and triphenylarsine relax predominantly by the dipole-dipole mechanism below about 40°C while the spin-rotation mechanism is most important above this temperature. The α carbon in triphenylstibine shows nonexponential decay since carbon bound to 121Sb relaxes by the scalar coupling mechanism at all temperatures while carbon bound to 123Sb relaxes by the dipole-dipole mechanism at low temperatures and spin-rotation at higher temperatures. The 121Sb-13C coupling constant is calculated to be 450 Hz.

Comments

Journal of the American Chemical Society, Vol. 100, No. 8 (April 1978): 2288-2291. DOI.

Share

COinS