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

作者：Hutchins Kristin M; Groeneman Ryan H; Reinheimer Eric W; Swenson Dale C; MacGillivray Leonard R^*

来源：Chemical Science, 2015, 6(8): 4717-4722.

DOI：10.1039/c5sc00988j

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.

• 出版日期2015