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Abstract The purpose of this review is to address fundamentals and applications of single-crystal-to-single-crystal (SCSC) reactions, based on the 2 + 2 photodimerization. An overview of SCSC 2 + 2 photodimerizations, which comprise single- and multi-component solids, will be given. We reveal that materials that exhibit SCSC reactivity can be considered to have been achieved via either discovery or design. We suggest that SCSC 2 + 2 photodimerizations, if generally achieved, could provide new avenues to control bulk physical properties of solid-state materials.
Friščić et al. (Fri,) studied this question.