Highly efficient color-tunable organic co-crystals unveiling polymorphism, isomerism, delayed fluorescence for optical waveguides and cell-imaging

Barman, D and Annadhasan, M and Bidkar, AP and Rajamalli, P and Barman, D and Ghosh, SS and Chandrasekar, R and Iyer, PK (2023) Highly efficient color-tunable organic co-crystals unveiling polymorphism, isomerism, delayed fluorescence for optical waveguides and cell-imaging. In: Nature Communications, 14 (1).

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Abstract

Photofunctional co-crystal engineering strategies based on donor-acceptor �-conjugated system facilitates expedient molecular packing, consistent morphology, and switchable optical properties, conferring synergic �structure-property relationship� for optoelectronic and biological functions. In this work, a series of organic co-crystals were formulated using a twisted aromatic hydrocarbon (TAH) donor and three diverse planar acceptors, resulting in color-tunable solid and aggregated state emission via variable packing and through-space charge-transfer interactions. While, adjusting the strength of acceptors, a structural transformation into hybrid stacking modes ultimately results in color-specific polymorphs, a configurational cis-isomer with very high photoluminescence quantum yield. The cis-isomeric co-crystal exhibits triplet-harvesting thermally activated delayed fluorescence (TADF) characteristics, presenting a key discovery in hydrocarbon-based multicomponent systems. Further, 1D-microrod-shaped co-crystal acts as an efficient photon-transducing optical waveguides, and their excellent dispersibility in water endows efficient cellular internalization with bright cell imaging performances. These salient approaches may open more avenues for the design and applications of TAH based co-crystals. © 2023, Springer Nature Limited.

Item Type:	Journal Article
Publication:	Nature Communications
Publisher:	Nature Research
Additional Information:	The copyright for this article belongs to authors.
Keywords:	aromatic hydrocarbon; hydrocarbon, aromatic hydrocarbon; crystal structure; fluorescence; imaging method; optical method, Article; cis isomer; crystal; fluorescence; internalization (cell); isomerism; isomerization; photoluminescence; photon; quantum yield
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	18 Nov 2024 21:32
Last Modified:	18 Nov 2024 21:32
URI:	http://eprints.iisc.ac.in/id/eprint/85337

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