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All bent out of shape: The solvent of crystallization effectively enhances the emission of flexible, bent, π‐conjugated molecules in the crystalline state owing to control of the packing of the molecules in the structure. Multichromism such as thermochromism and vapochromism also arises from the solvent‐controlled packing. This crystalline‐state emission is attributable to the flexibility of cyclooctatetraene...
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