Tuning the solid-state emission by co-crystallization through σ- and π-hole directed intermolecular interactions?

CrystEngComm Pub Date: 2019-02-13 DOI: 10.1039/C8CE02118J

Abstract

Four new binary luminescent co-crystals and a co-crystal stoichiomorph comprising aromatic compounds and 1,4-diiodotetrafluorobenzene were successfully synthesized by the solvent drop grinding method. Structural features of these co-crystals indicate that the relative interplay of σ- and π-hole directed intermolecular interactions were observed to be responsible for modulating luminescence properties of those materials. Investigation of photoluminescence properties reveals that there is a substantial change in emission color from the starting aromatic materials to co-crystals. The I?N and σ-hole?π halogen bonds along with π-hole?π interactions have been instrumental towards altering the emissive properties of the luminescent materials.

Graphical abstract: Tuning the solid-state emission by co-crystallization through σ- and π-hole directed intermolecular interactions
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