Synthesis, spectral characterization, thermal and biological studies of mononuclear Cr(III), Mn(III), Fe(III), VO(IV) and UO2(VI) complexes derived from thiocarbohydrazone ligand

P. R. Mandlik; P. K. Deshmukh

Volume : X, Issue : VII, July - 2020

Synthesis, spectral characterization, thermal and biological studies of mononuclear Cr(III), Mn(III), Fe(III), VO(IV) and UO2(VI) complexes derived from thiocarbohydrazone ligand

P. R. Mandlik, P. K. Deshmukh

Abstract :

New metal complexes of ML type, where M= Cr(III), Mn(III), Fe(III), VO(IV) and UO2(VI) was synthesized by using thoicarbohydrazone (LH2) derived from thiocarbohydrazide and 5–omo–2–hydroxyacetophenone. Newly synthesized complexes were characterized by elemental analysis, IR, 1H NMR, mass spectra, molar conductance, magnetic measurements, ESR and TG analysis. The data of molar conductance indicated the non–electrolyte nature for all synthesized metal complexes. The spectroscopic data pointed out the behavior of the ligand towards metal ions from which the coordination number of complexes exhibited to be five and six. The parameters summarized from the ESR spectra of VO(IV) complex confirmed the proposed structure. The thermogravimetric analysis for complexes suggests the absence of water molecule in or out of the coordination sphere. From the change in weight with respect to temperature, activation energy, free energy and order of reaction of complexes was calculated. The thiocarbohydrazone ligand shows lower antibacterial activity than the complexes.