Achieving dynamic behaviour and thermal expansion in the organic solid state via co-crystallization

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Abstract

Thermal expansion involves a response of a material to an external stimulus that typically involves an increase in a crystallographic axis (positive thermal expansion (PTE)), although shrinking with applied heat (negative thermal expansion (NTE)) is known in rarer cases. Here, we demonstrate a means to achieve dynamic molecular motion and thermal expansions in organic solids via co-crystallizations. One co-crystal component is known to exhibit dynamic behaviour in the solid state while the second, when varied systematically, affords co-crystals with linear thermal expansion coefficients that range from colossal to nearly zero. Two co-crystals exhibit rare NTE. We expect the approach to guide the design of molecular solids that enable predesigned motion related to thermal expansion processes.

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Hutchins, K. M., Groeneman, R. H., Reinheimer, E. W., Swenson, D. C., & MacGillivray, L. R. (2015). Achieving dynamic behaviour and thermal expansion in the organic solid state via co-crystallization. Chemical Science, 6(8), 4717–4722. https://doi.org/10.1039/c5sc00988j

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