Materials and synthesis, supporting tables and figures as detailed in the text, BFDH morphologies of 1, 2, and 4, interaction figures, and strain calculations (PDF) Bending−relaxation cycles of a crystal 1 (MPG) Bending−relaxation cycles of a crystal 2 (MPG) Bending−relaxation cycles of a crystal 4 (MPG)

Two isomorphous crystals are reported based on a naphthylvinylpyridine coformer. The crystals are mechanically flexible and exhibit photosalient response to UV irradiation. We therefore show how multiple mechanical phenomena can be simultaneously designed into a single material by cocrystallization.

Here, we report long acicular acylhydrazone crystals (Ac) derived from 4nitro benzhydrazide and 10-chloro-9-anthraldehyde. The crystal exhibited dual mechanical responses such as stress-induced elastic and light-induced photomechanical bending. Further, the crystal exhibits excellent photoswitching and thermal reversible behavior as well. Detailed investigation revealed structure−property correlation in crystal Ac. Additionally, it has been observed that stimuli-responsive mechanical properties were unique and not interlinked with each other. With the help of the crystal engineering approach, synergistic mechanical responses can be gainfully combined toward applications in multitasking single-crystal actuators.

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