Abstract
Two new hexa-coordinated mononuclear copper(II) complexes of two ligands L 1 and L 2 containing NSSN donor sets formulated as [Cu(L)(H 2O) 2](NO 3) 2 [ 1a, L = 1,2-bis(2-pyridylmethylthio)ethane (L 1), 1b L = 1,3-bis(2-pyridyl-methylthio)propane (L 2)] were synthesized and characterized by physico-chemical and spectroscopic methods. In 1a the single crystal X-ray crystallography analysis showed a distorted octahedral geometry about copper(II) ion. The crystal packing evidences pairs of complexes arranged about a center of symmetry and connected through a H-bond occurring between aquo ligands and nitrate anions. On reaction with chloride and pseudohalides (N 3 − and SCN −), in acetonitrile at ambient temperature, complexes 1 changed to monocationic penta-coordinated mononuclear copper(II) species formulated as [Cu(L)(Cl)]NO 3 ( 2), [Cu(L)(N 3)]NO 3 ( 3), and [Cu(L)(SCN)]NO 3 ( 4). These copper(II) complexes have been isolated in pure form from the reaction mixtures and characterized by physico-chemical and spectroscopic tools. The solid-state structure of 2a, established by X-ray crystallography, shows a trigonal bipyramidal geometry about the metal ion with a trigonality index ( τ) of 0.561.
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