Photocontraction of Liquid Spiropyran-Merocyanine Films

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Science  19 Oct 1984:
Vol. 226, Issue 4672, pp. 341-343
DOI: 10.1126/science.226.4672.341


Amorphous films of a photochromic spiropyran containing a mesogenic group melt, when exposed to heat together with irradiation, to yield a red fluid. This fluid contains aggregates of merocyanine molecules and exhibits marked contraction under light illumination. The mechanism of the photocontraction is dependent upon a specialized microstructure, which may be termed a "quasi-liquid."

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