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• W2801542270 abstract "We report the serendipitous discovery of an optical mercury sensor while trying to develop a water-soluble manganese probe. The sensor is based on a pentaaza macrocycle conjugated to a hemicyanine dye. The pentaaza macrocycle earlier designed in our group was used to develop photoinduced electron transfer (PET)-based “turn-on” fluorescent sensors for manganese.(1) In an attempt to increase the water-solubility of the manganese sensors we changed the dye from BODIPY to hemicyanine. The resultant molecule qHCM afforded a distinct reversible change in the absorption features and a concomitant visible color change upon binding to Hg2+ ions, leading to a highly water-soluble mercury sensor with a 10 ppb detection limit. The molecule acts as a reversible “ON–OFF” fluorescent sensor for Hg2+ with a 35 times decrease in the emission intensity in the presence of 1 equiv of Hg2+ ions. We have demonstrated the applicability of the probe for detecting Hg2+ ions in living cells and in live zebrafish larvae using confocal fluorescence microscopy with visible excitation. High selectivity and sensitivity toward Hg2+ detection make qHCM an attractive probe for detecting Hg2+ in contaminated water sources, which is a major environmental toxicity concern. We have scrutinized the altered metal-ion selectivity of the probe using density functional theory (DFT) and time-dependent DFT calculations, which show that a PET-based metal-sensing scheme is not operational in qHCM. 1H NMR studies and DFT calculations indicate that Hg2+ ions coordinate to oxygen-donor atoms from both the chromophore and macrocycle, leading to sensitive mercury detection." @default.
• W2801542270 created "2018-05-17" @default.
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• W2801542270 date "2018-04-18" @default.
• W2801542270 modified "2023-10-16" @default.
• W2801542270 title "A Sensitive Water-Soluble Reversible Optical Probe for Hg²⁺ Detection" @default.
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• W2801542270 doi "https://doi.org/10.1021/acs.inorgchem.8b00310" @default.
• W2801542270 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29667813" @default.
• W2801542270 hasPublicationYear "2018" @default.
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