Abstract
Biochanin A (BnA) a natural o-methylated isoflavone, is isolated from the leaves of Eupatorium adenaphorum and is effectively utilized as a sensor probe for copper ion with good selectivity and sensitivity. The effect with the presence of other metal ions is also investigated and BnA is found to be selective towards Cu2+ ion over other metal ions such as Zn2+, Sn2+, Ni2+, Ag+, Bi2+, Pb2+, Co3+, In3+, Mn2+, Fe2+, Li+, Hg2+ and Ca2+ at pH 7.1 with a detection limit upto 1.0×10−6molL−1. The sensor probe BnA exhibits selective fluorescence quenching via an intramolecular charge transfer (ICT) upon addition of Cu2+. The proposed mechanism is strongly supported by TD-DFT calculations and the 1:1 complex (BnA–Cu2+) formation is confirmed by ESI-MS and Job's plot.
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