(Bipyridine)(terpyridine)(4-iodophenylcyanamide)ruthenium(II) complex: crystallography, electronic absorption spectroscopy, cyclic voltammetry and EPR measurements

The complex [Ru(bpy)(tpy)(Ipcyd)](+) (where bpy: 2,2'-bipyridine, tpy: 2,2':6',2 -terpyridine and Ipcyd: 4-iodophenyloyanamide anion) has been synthesized. An extensive characterization was carried out using IR, H-1 and C-13 NMR, ES-MS, UV-Vis, electrochemistry, EPR and X-ray single crystal diffraction analysis. Cyclic voltammogram shows an irreversible anodic peak around 0.7 V/ECS, the shape of the wave is typical of an electrochemical-chemical (EC) mechanism with an half-life time in the order of seconds for the generated species. Oxidation of the title compound has been investigated in order to explore its ability as a magnetic probe for further electronic studies on dinuclear complexes. The EPR spectrum at 100 K of the monooxidized species displays g(perpendicular to) = 2.00 and g(parallel to) = 1.96 attributed to the presence of a radical coming from the phenylcyanamide oxidation, in relative good agreement with EH and ZINDO calculations. (C) 2001 Elsevier Science B.V. All rights reserved.