Electronic singlet-singlet absorption spectra of α-naphtol in pure and mixed crystals

Abstract

Polarized S-S absorption spectra of α-naphtol single crystals show that the first two electronic absorption systems are respectively long-axis and short-axis polarized (A′←A′) transitions. The polarized absorption spectra of α-naphtol in a diphenyl host crystal, however, show that the electronic transition of the α-naphtol molecule is not exactly along the long axis, but slightly bent towards the short axis of the molecule.