Abstract

Facile fabrication of free-floating organic nanocrystals (ONCs) was achieved via kinetically controlled self-assembly of simple amphiphilic perylene diimide building blocks in aqueous media. The ONCs have a thin rectangular shape, with the aspect ratio that is controlled via organic co-solvent (THF) content. The nanocrystals were characterized in solution by cryogenic transmission electron microscopy (cryo-TEM) and small angle X-ray scattering (SAXS); the ONCs retain their structure upon drying as was evidenced by TEM and AFM. Photophysical studies, including femtosecond transient absorption spectroscopy, revealed a distinct influence of the ONC morphology on their photonic properties (excitation energy transfer was observed only in the high aspect ONCs). Convenient control over structure and function of organic nanocrystals can enhance their utility in new and developed technologies.

Keywords: Keywords: self-assembly; organic nanocrystals;  aromatic amphiphiles; exciton diffusion; perylene diimides

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Shahar, C.; Tidhar, Y.; Jung, Y.; Weissman, H.; Cohen, S. R.; Bitton, R.; Pinkas, I.; Haran, G.; Rybtchinski, B. Beilstein Arch. 2020, 2020100. doi:10.3762/bxiv.2020.100.v1

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