Use of a Diels-Alder reaction to modify thermal expansion properties in charge-transfer cocrystals

A strategy for modifying thermal expansion properties in dichroic, charge-transfer cocrystals is described. A solid-state Diels-Alder reaction is used to covalently connect adjacent molecules in the cocrystal, and thermal expansion along the direction of these bonds is reduced when compared to the unreacted cocrystals. A strategy for modifying thermal expansion properties in dichroic, charge-transfer cocrystals is described.