Spin-Lattice Relaxation in Triphenylphospine, Triphenylarsine, and Triphenylstine

Authors

Charles Wilkie, Marquette UniversityFollow

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. © 1978. Used with permission.

Recommended Citation

Wilkie, Charles, "Spin-Lattice Relaxation in Triphenylphospine, Triphenylarsine, and Triphenylstine" (1978). Chemistry Faculty Research and Publications. 787.
https://epublications.marquette.edu/chem_fac/787