Abstract
Mercury (Hg) causes serious health issues in its all forms. Deficiency as well as excess of copper ion (Cu2+) in human body is hazardous. A series of four compounds have been derived from carboxylated benzoic acids (benzoic acid, isophthalic acid, terephthalic acid and phthalic acid) and 4H-1,2,4 triazole-4-amine and characterized. Fluorescence detection of Hg2+ was recorded by the derivates with benzoic acid and isophthalic acid while the derivatives of terephthalic acid and phthalic acid detect Cu2+ by fluorescence "off" mode. Metal ions like Li+, Na+, K+, Zn2+, Al3+, Mg2+, Mn2+, Co2+, Ni2+, Cu2+, Cd2+, Pb2+ and Hg2+ found not to interfere. The stoichiometry of binding is 1:1 for the benzoic acid derivative with Hg2+ while it is 1:2 for the other three derivatives. The binding constants are ca. 10-4.5 between the sensors and Hg2+ or Cu2+ and detection limits are around 10-5.5M. DFT calculation provided optimized geometries of the sensors and confirmed the stoichiometry of binding with Hg2+/Cu2+.
Highlights
Most of the heavy metals in ionic form are hazardous to the environment and human health and one of them is Mercury ion (Hg2+) [1]
In this paper we report the synthesis and characterization of a series of four compounds derived from 4H1,2,4 triazole-4-amine and carboxylated benzoic acids
The solutions of AM1, AM2, AM3 and AM4 were titrated with the metal ions - Li+, Na+, K+, Mg2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Al3+, Pb2+ and Hg2+
Summary
Most of the heavy metals in ionic form are hazardous to the environment and human health and one of them is Mercury ion (Hg2+) [1]. Pesticides and paper mills are other major sources of Hg2+ pollution. Compact Fluorescent Lamps contain Hg2+ ions and have become a matter of great environmental concern as unscientific disposal of CFLs acts as source of Hg2+ pollution [5]. Hg2+ is more toxic in metalo-organic form and can lead to deterioration of brain, hamper fetus growth [6], can damage immune system, kidney, heart, and lung of human being [7]. Monitoring system for Hg2+ in water has been a matter of utmost importance with respect to the environmental and human health
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