Abstract
Five new Schiff base ligands and conformationally rigid half-sandwich organo ruthenium(II) Schiff base complexes (1–5) with the general formula [Ru(η6‒p‒cymene)(Cl)(L1-5)] (where, L = mono anionic Schiff base ligands) have been synthesized from the reaction of [{(η6‒p‒cymene)RuCl}2(μ‒Cl)2] with a bidentate Schiff bases ligands. These ruthenium(II) Schiff base complexes were fully characterized by elemental analysis, FT‒IR, UV–Vis, 1H &13C NMR and mass spectroscopy studies. In chloroform solution, all the metal complexes exhibit characteristic metal to ligand charge transfer bands (MLCT) and emission bands in the visible region. The crystal structure of the complexes [Ru(η6‒p‒cymene)(Cl)(L1)] (1) and [Ru(η6‒p‒cymene)(Cl)(L3)] (3) were determined by single crystal X‒ray crystallography. The complexes exhibited good catalytic activity for aldehydes to amides by one-pot conversion process in the presence of NaHCO3/NH2OH·HCl.
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