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

Abstract

Solid complexes of Pb(II) with unsymmetrical Schiff-base ligands (H 2 L) 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, 1 H NMR, and 13 C 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, [PbL 1 ], to substantiate the proposed structures.

Synthesis and Characterization of New Lead(II) and Organotin(IV) Complexes of Schiff Bases Derived from Histidine and Methionine

“…Several new band appearing in the complexes at ∼460, ∼545, ∼660, ∼460, and ∼540 cm −1 are probably due to ν(Sn-O) [15,24], ν(Sn←N) [15,25], ν(Sn-C) [15,26], ν(Pb-O) [13,27], and ν(Pb←N) [13,27], respectively.…”

New iron(iii) complex of bis-bidentate-anchored diacyl resorcinol on a Fe3O4 nanomagnet: C–H bond oxygenation, oxidative cleavage of alkenes and benzoxazole synthesis

“…Schiff base ligands and especially their metal complexes are widely used in materials science. [1][2][3][4][5][6][7][8] Nowadays, polynuclear Schiff base-metal complexes are attracting a remarkable level of interest. 9,10 Among these materials, the bis-bidentate 4,6diacetyl resorcinol (DAR) ligand 11 and some DAR-based complexes, such as dioxido and oxidomethoxido vanadium(V), have been synthesized and their catalytic activities investigated.…”