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Synthesis, spectroscopic characterization, and 3D molecular modeling of lead(II) complexes of unsymmetrical tetradentate Schiff-base ligands

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Abstract

Solid complexes of Pb(II) with unsymmetrical Schiff-base ligands (H2L) derived from 2-aminobenzophenone, thiosemicarbazide, semicarbazide, salicylaldehyde, 2-hydroxynaphthaldehyde, and o-hydroxyacetophenone have been synthesized and characterized by elemental analysis, conductance measurements, molecular weight measurement, and UV–Vis, FTIR, 1H NMR, and 13C NMR spectroscopy. The spectral studies suggest the ligands behave as dibasic tetradentate ligands with ONNO/ONNS donor atom sequences toward the central metal ion. From the microanalytical data, the stoichiometry of the complexes was found to be 1:1 (metal:ligand). The physicochemical data suggest a tetracoordinated environment around the metal ion. Three-dimensional molecular modeling and analysis of bond lengths and bond angles have also been conducted for a representative compound, [PbL1], to substantiate the proposed structures.

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Scheme 1
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Acknowledgments

The author is thankful to Professor P.K. Das, Dean, Faculty of Engineering and Technology, Mody Institute of Technology and Science, Deemed University, Lakshmangarh, Sikar for providing necessary facilities.

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  1. Department of Chemistry, Faculty of Engineering & Technology, Mody Institute of Technology and Science, Lakshmangarh, Sikar, Rajasthan, India

    Har Lal Singh

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  1. Har Lal Singh
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Singh, H.L. Synthesis, spectroscopic characterization, and 3D molecular modeling of lead(II) complexes of unsymmetrical tetradentate Schiff-base ligands. Res Chem Intermed 37, 1087–1101 (2011). https://doi.org/10.1007/s11164-011-0319-6

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