Investigation of the stark effect on the lowest triplet states of 1-indanone single crystals

Abstract

The Stark effect on the absorption, emission excitation, and phosphorescence spectra of neat 1-indanone single crystals was investigated. Only the phosphorescence, which stems from an X-trap, exhibited an effect. The absence of any effect in the absorption and emission excitation spectra of the triplet nπ* and ππ* exciton states is interpreted as evidence for significant excitation transfer interactions and small dipole moment difference vectors. A partial assignment of the factor group components of the two different exciton states is made. The similarity of the excitation transfer interactions for the two exciton states, the small dipole moment difference vectors, and the magnitude of the Stark effect for the trap are interpreted as evidence that the exciton and trap states result from significant mixing between nπ* and ππ* orbital configurations.