Published Research - Department of Chemistry


Date of this Version

October 1977


Published by American Institute of Physics. J. Chemical Physics Volume 67, Issue 8, pp. 3616-3618 (1977). ©1977 American Institute of Physics. Permission to use.


Specular reflection spectra are reported for a thermochromic polydiacetylene crystal, ETCD [substituent group – (CH2)4OCONHC2H5] over the temperature range 23–130°C. A reversible thermochromic phase change occurs at ~120°C and is accompanied by a 2750 cm-1 blue shift in the reflection spectra. Evidence is presented which strongly suggests that the dramatic change in optical properties of ETCD at the phase transition is due to an acetylene to butatriene transformation in the bonding sequence of the polydiacetylene backbone.

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