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Two crystalline polymorphs of a conjugated organic fluorophore were obtained through separate synthetic protocols despite crystallizing under identical conditions. The unique polymorphs were confirmed by single-crystal X-ray diffraction. The two polymorphs had markedly different supramolecular packing. Thus, polymorph A was stabilized by directional C–H···N/S interactions with limited π overlap, while polymorph B assembled into extended π–π stacks and a denser network with short contacts. These structural differences resulted in distinct photophysics. Indeed, the emission quantum yield (Φfl) of Polymorph B was 4-fold lower along with multiexponential excited state kinetics compared to Polymorph A in addition to a 38 nm blue-shift in the emission. The metastable polymorph B could be converted to the thermodynamically stable Polymorph A by grinding the pristine crystal. Both intra- and supramolecular contacts could be leveraged to guide the crystal packing for modulating the emissive properties of the intrinsic fluorophores.
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Orlando Ortiz
A. Mohan Raj
Thierry Maris
Crystal Growth & Design
Université de Montréal
Polytechnique Montréal
Département de Chimie Moléculaire
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Ortiz et al. (Tue,) studied this question.
www.synapsesocial.com/papers/6a07f12f686e45fdbcfe0b48 — DOI: https://doi.org/10.1021/acs.cgd.5c01310