Published Research - Department of Chemistry


Date of this Version

June 1979


Published by American Institute of Physics. J. Chem. Physics Volume 70, Issue 12, pp. 5498-5502 (1979). ©1979 American Institute of Physics. Permission to use.


The reflection spectra of single crystals of the polydiacetylene, IPUDO [R= (CH2)4OCONHCH (CH3)2], were measured between 25° C and 160° C. A nearly reversible thermochromic change is observed together with a variation of hysteresis upon cycling. The latter is attributed to annealing that permits the pendant groups to adopt a conformation which favors the butatriene-type configuration of the polymer at high temperatures. Intensities of the high and low temperature spectra obtained by Kramers–Kronig transforms are in excellent agreement with the spectral intensities of polydiacetylenes which are prototypes for the two configurations.

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