Electron spin resonance of alkali metal–o-dimesitoylbenzene radical complexes

Abstract

The alkali metal complexes with o-dimesitoylbenzene have been investigated with particular emphasis on the alkali metal hyperfine constants. Linewidth variation among the different hyperfine components of the e.s.r. spectra are analyzed in terms of an incomplete averaging of the anisotropic g factor and electron-nucleus dipolar interactions, for which indicative values are obtained.

The alkali metal hyperfine coupling constants which are positive, are in agreement with a structure of the complex with the mesitoyl groups rotated in a conrotatory mode. Approximate molecular orbital calculations on the complexes are also reported.