Abstract
The effect of silver ions (Ag+) on the photophysical behavior of 5-aminoquinoline (5AQ) has been studied in an aqueous environment using steady-state and time-resolved spectroscopic techniques. 5-AQ exhibits two weak fluorescence (FL) bands in an aqueous medium. The successive addition of Ag+ ions to the aqueous solution of 5AQ amplify the FL intensity of the large Stokes shifted band upto 21 folds accompanied by a red-shift as a result of the acceleration of charge transfer (CT) process and restriction of hydrogen bonding in the excited state. 5AQ exhibits good selectivity for Ag+ ion over other metal ions (Li+, K+, Pb2+, Zn2+, Fe2+, Mn2+, Mg2+, Cu2+, Cd2+, Co2+, Cr3+, Ni2+). The Benesi-Hildebrand and Hills equations together with DFT calculations demonstrated the formation of 1:1 complex between 5AQ and Ag+. Furthermore, 5AQ can perform as an INHIBIT logic gate triggered by Ag+ and H+ ions. Hence, the proposed study appears to be interesting in the detection of Ag+ ions in aqueous media to a certain extent, indicating that 5AQ would have potential applications in the environmental and biological monitoring of Ag+ ions. Additionally, practical application carried out indicates that 5AQ can be used for the recognition of Ag+ ions in drinking water samples.
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