Triplet Excitons in Morpholinium TCNQ

Publisher Website
Google Scholar
Abstract
Certain coincidences are noted between (a) the magnetic axes of triplet excitons in morpholinium TCNQ and (b) crystallographic axes determined by x‐ray diffraction. These coincidences can be understood quantitatively in terms of an assumed crystal structure in which pairs of TCNQ− molecules (``dimers'') have D2h point‐group symmetry and dimer symmetry axes that (nearly) coincide with certain crystallographic axes of the triclinic crystal. Observed fine‐structure splitting parameters, | D | = 450 Mc/sec, | E | = 53.8 Mc/sec are in excellent agreement with theoretical values D=−464 Mc/sec, E=44 Mc/sec calculated using Hückel spin densities on TCNQ molecules together with the assumption that there is no intermolecular charge (and spin) transfer in the triplet‐exciton state.

This publication has 5 references indexed in Scilit: