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

Debasish Barman, Mari Annadhasan, Anil Parsram Bidkar, Pachaiyappan Rajamalli, Debika Barman, Siddhartha Sankar Ghosh (), Rajadurai Chandrasekar () and Parameswar Krishnan Iyer ()
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Debasish Barman: Indian Institute of Technology Guwahati
Mari Annadhasan: School of Chemistry, and Centre for Nanotechnology University of Hyderabad, Gachibowli
Anil Parsram Bidkar: University of California, San Francisco
Pachaiyappan Rajamalli: Indian Institute of Science
Debika Barman: Indian Institute of Technology Guwahati
Siddhartha Sankar Ghosh: Department of Biosciences and Bioengineering IIT Guwahati
Rajadurai Chandrasekar: School of Chemistry, and Centre for Nanotechnology University of Hyderabad, Gachibowli
Parameswar Krishnan Iyer: Indian Institute of Technology Guwahati

Nature Communications, 2023, vol. 14, issue 1, 1-17

Abstract: Abstract Photofunctional co-crystal engineering strategies based on donor-acceptor π-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.

Date: 2023
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DOI: 10.1038/s41467-023-42017-8

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