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Synthesis and characterization of new dioxomolybdenum(VI) complexes of ONS donor Schiff bases derived from thiosemicarbazide,S-methyldithiocarbazate,S-benzyldithiocarbazate ando-hydroxy-aromatic aldehydes/ketones
Authors:Arun Syamal  Mannar Ram Maurya
Institution:(1) Department of Applied Sciences and Humanities, Kurukshetra University, Kurukshetra 132119, Haryana, India;(2) Department of Chemistry, Regional Engineering College, Kurukshetra 132119, Haryana, India
Abstract:Summary Syntheses of several new dioxomolybdenum(VI) complexes with composition MoO2L · MeOH (where LH2 = Schiff base derived from salicylaldehyde, 2-hydroxy-1-naphthaldehyde,o-hydroxyacetophenone,o-hydroxybenzophenone, pyridoxal and thiosemicarbazide,S-methyldithiocarbazate orS-benzyldithiocarbazate) are reported. The complexes have been characterized by elemental analysis, i.r., n.m.r. and electronic spectra, conductance, molecular weight and magnetic susceptibility measurements. The complexes are monomers, nonelectrolytes, diamagnetic and six-coordinated. The Schiff bases behave as dibasic tridentate ligands and coordinate through phenolic oxygen, thioenolic sulphur and azomethine nitrogen atoms. The complexes have acis-O=Mo=O structure as evidenced by the presence of two strong bands at 880–915 and 925–955 cm–1. All of the complexes exhibit a band atca. 25000 cm–1 due to the ligand to metal charge transfer transition.
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