Studies on Zinc complexes in Nitrogen rich ligand environment

Abstract

In the present work, the focus has been given to the synthesis and study of zinc complexes in nitrogen rich ligand environment. A Schiff base ligand HL was synthesized which was used to synthesize three new zinc complexes [Zn(HL)(N3)2]•H2O, [Zn(HL)(5-phenyltetrazolato)2] and [Zn(HL){5-(4-pyridyl)-tetrazolato}2]. All the complexes are characterized through ESI-MS and IR spectroscopy. Single crystal X-ray diffraction analysis has been done for zinc-Schiff base complex [Zn(HL)(N3)2]•H2O. The Schiff base ligand and complex [Zn(HL)(N3)2]•H2O have also been characterized through NMR spectroscopy. Sensing properties of complex [Zn(HL)(N3)2]•H2O have been studied using fluorescence and it is found that the complex shows good anion sensing ability for different phosphates and primarily dihydrogen phosphate (H2PO4-) anion. The detection limit was found to be 243 nM. Recovery analysis was done for real-life water samples for determination of concentration of dihydrogen phosphate anion and the observed value was found to be in good agreement with the actual value.