Abstract
A heptadentate N4O3 coordinated dinuclear zinc complex was synthesized. The sensor functioned as a “turn-on” fluorescence receptor only to Zn2+ ion in 3:2 v/v MeOH/water in HEPES buffer at pH 7.2 at 25 °C. A huge increase in emission intensity (approximately 200 times) of the ligand was observed in the presence of Zn2+ which was accounted for by the formation of a metal-ligand complex and thus could be used as zinc ion-selective luminescent probe, continuously emitting blue light in the presence of a UV lamp. The theoretically optimized geometry in solution state gives an idea about bond relaxation as well as change the geometric scenario of the coordinated metal ion from trigonal bipyramidal to square pyramidal.
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