Abstract
In this article, we have designed and synthesized a new, convenient and efficient phenanthroquinone–pyridoxal based fluorogenic probe PQPY, highly suitable for the selective and sensitive detection of nitric oxide in an aerated aqueous (7: 3/H2O: MeCN) medium at pH 7.0 (10 mM HEPES buffer). Upon addition of nitric oxide, this probe exhibits emission in the green region (λem = 505 nm) which is ascribed to ICT (intramolecular charge transfer) from the phenanthroquinone moiety to the imidazole–N–N=O fragment. The apparent formation constant, Kf, of the NO product of the ligand is (1.00 ± 0.2) × 105 M−1 and the LOD is 78 nM. The substantial enhancement of the life-time of the ligand (τ0 = 2.68 ns) occurs due to binding with nitric oxide (τ0 = 3.96 ns). This probe is low cytotoxicity, cell permeable and suitable for living cell imaging application.
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Financial supports from the DST (Ref. No. 809(Sanc)/ST/P/S&T/4G-9/2104), West Bengal and the CSIR (Ref. 01(2896)/17/EMR-II), New Delhi, India are gratefully acknowledged. D. Maiti thanks DST-INSPIRE for the financial assistance as a junior Research Fellow (JRF).
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Maiti, D., Islam, A.S.M., Sasmal, M. et al. Selective sensing of nitric oxide by a 9,10-phenanthroquinone–pyridoxal based fluorophore. Photochem Photobiol Sci 17, 1213–1221 (2018). https://doi.org/10.1039/c8pp00115d
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DOI: https://doi.org/10.1039/c8pp00115d