Influence of crystal fields on the quasimetallic reflection spectra of crystals: Optical spectra of polymorphs of a squarylium dye

Authors

M. Tristani-Kendra, University of Nebraska - Lincoln
Craig J. Eckhardt, University of Nebraska - LincolnFollow

Date of this Version

August 1984

Comments

Published by American Institute of Physics. J. Chem. Physics Volume 81, Issue 3, pp. 1160-1173 (1984). ©1984 American Institute of Physics. Permission to use. http://jcp.aip.org/.

Abstract

The reflection and Kramers–Kronig absorption spectra have been obtained from the monoclinic and triclinic polymorphs of a squarylium dye, 2,4-bis(4-diethylamino-2-hydroxy phenyl) cyclobutadienediylium-1,3-diolate. The extremely different optical responses were found to arise from two molecular singlet transitions of essentially long axis polarization. Successful application of a four oscillator molecular exciton–polariton theory required the use of point charge densities rather than point dipoles in an extension of the theory which employed both interactions between the two singlets as well as a frequency dependent lattice damping. An intermolecular charge transfer transition is also assigned. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.