Cooperative metal-ligand-induced properties of heteroleptic copper(I) xanthate/dithiocarbamate PPh3 complexes

Abstract

Four new heteroleptic mononuclear complexes, [Cu(PPh3) 2L1](1) {L1 = (C9H 11O2CS2-), [2-(4-methoxyphenyl) ethyl]xanthate}, [Cu(PPh3)2L2] (2) [L 2 = (C6H7OCS2-), benzylxanthate], [Cu(PPh3)2L3] (3) [L 3 = (C5H9OCS2-), (cyclobutylmethyl)xanthate] and [Cu(PPh3)2L4] (4) [L4 = (NC13H13NCS2-), N-benzyl-N-(4-pyridylmethyl)dithiocarbamate], have been synthesized and characterized by using microanalysis, IR, UV/Vis, 1H, 13C and 31P NMR spectroscopy and X-ray crystallography; their photoluminescent behaviour and molecular electrical conductivity have been investigated. CuI possesses four-coordinate distorted tetrahedral geometry in all the complexes. All are weakly conducting and exhibit semiconductor behaviour in the studied 303-363 K temperature range. Complex 4 shows striking luminescent behaviour emitting bluish green light at 480 nm in CH2Cl2 solution at room temperature. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.