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Updated: Sep 16, 2025

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
Published on: February 7, 2022
AIE-Active BODIHYs Based on Benzothiazole-Hydrazone Chelates and Their Artificial Light Harvesting and Reversible
Nikhil Kumar Singh1, Ashish Kumar Kushwaha1, Daya Shankar Pandey1
1Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India.
None:
Efficient artificial light-harvesting systems (ALH) involving energy transfer via FRET in an aqueous environment has been reported. Hydrazone ligands L1-L3 and -BF2 complexes (BODIHYs; B1-B3) derived from these have been synthesized and meticulously characterized by various techniques like1H, 13C, 11B, 19F NMR, ESI-MS, UV-vis, fluorescence spectroscopy, and structures of B1 and B2 unequivocally determined by X-ray single crystal analyses. Applicability of the B1-B3 have been examined as a LHS platform and categorically shown that these in combination with rhodamine B (RhB) display efficient light harvesting activity under aqueous conditions via aggregation-induced emission (AIE). Calculated energy transfer efficiency and antenna effect for the BODIHYs are significantly high (B1 = 22%, 5.04; B2 = 18%, 4.07) at a donor/acceptor ratio of 23:1. Furthermore, hypsochromic shift shown by B1 and B2 after grinding completely reverses upon exposure to dichloromethane vapors. Powder X-ray diffraction (PXRD) analyses before and after grinding revealed that the external forces modify crystal packing by disrupting weak intra- and intermolecular interactions within the molecules.
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