OPTICAL PROPERTIES OF POLYDIACETYLENE SINGLE CRYSTALS
Loading...
Date
1977
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Optical constants for a. series of polydiacetylene crystals have been obtained by taking the Kramers-Kronig transform of the specular reflection and modulated piezoreflection spectra at $300^\circ K$ and $77^\circ K$. Photoconductivity results are also reported. Spectra are of two types represented by PTS and TCDU. A thermochromic polydiacetylene, ETCD, undergoes a phase transition near $398^\circ K$ where its spectrum changes from PTS-type to TCDU-type. In contrast to TCDU, spectra for PTS indicate that the observed band from 15 000 $cm^{-1}$ to 25 000 $cm^{-1}$ has more than one vibronic origin. From these optical and X-ray crystallographic studies, it is concluded that PTS and TCDU are electronic states of the polydiacetylene chain which have been stabilized differently.
Description
Author Institution: Department of Chemistry, University of Nebraska; Materials Research Center, Allied Chemical Corporation