Tuning the solid-state emission by co-crystallization through σ- and π-hole directed intermolecular interactions†
Rohit
Bhowal, 
a
Suprakash
Biswas,
a
Devi Prasad
Adiyeri Saseendran,
a
Apurba L.
Koner
*a
and
Deepak
Chopra
*a
a
Suprakash
Biswas,
a
Devi Prasad
Adiyeri Saseendran,
a
Apurba L.
Koner
*a
and
Deepak
Chopra
*a
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.
- This article is part of the themed collections: Introducing the CrystEngComm Advisory Board and their research and 1st International Conference on Noncovalent Interactions
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