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The reversible photoconversion of self-assembling dithienylcyclopentene photochromic switches between an aggregated and nonaggregated state is manifest at the macroscopic level by a fully reversible sol–gel phase transition and results in spatially confined structure formation in an inhomogeneous optical field. The reversibility of aggregation is exploited in dynamic pattern formation (see images).
Jong et al. (Thu,) studied this question.