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A Phenanthroimidazole‐based Fluorescent Turn‐Off Chemosensor for the Selective Detection of Cu 2+ in Aqueous Media
Author(s) -
Hwang Suh Mi,
Chae Ju Byeong,
Kim Cheal
Publication year - 2018
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.11526
Subject(s) - fluorescence , intramolecular force , chemistry , photochemistry , titration , detection limit , aqueous solution , phenanthroline , quenching (fluorescence) , inorganic chemistry , stereochemistry , chromatography , physics , quantum mechanics
A new phenanthroline‐based chemosensor 3‐(1H‐phenanthro[9,10‐ d ]imidazol‐2‐yl)benzene‐1,2‐diol ( 1 ) was synthesized for the recognition of Cu 2+ . Sensor 1 showed selective fluorescence quenching for Cu 2+ in aqueous media. Detection limit (0.87 μM) for Cu 2+ was much lower than WHO guideline (31.5 μM). Sensing property of 1 toward Cu 2+ was studied by fluorescence and UV–Vis titrations, and Job plot and ESI‐MS analyses. Moreover, turn‐off fluorescence mechanism of 1 toward Cu 2+ induced by intramolecular charge‐transfer (ICT) and ligand‐to‐metal charge‐transfer (LMCT) was well demonstrated by theoretical calculations.