Ru(phen)2(bis-thioether)2+ complexes: Synthesis and photosubstitution reactions
摘要:
Three new ruthenium(II) complexes which contain two 1, 10-phenanthroline units and a third bis-thioether chelate have been prepared and characterized. For two complexes, the X-ray structure shows a perfect fit between the two phen ligands and the bis-thioethers, with almost perfect C-2 symmetry for the Ru(phen)2 unit and the S-containing ligand. This geometrical complementarity is also reflected by pi-pi stacking between the phen nuclei and the S-borne phenyl rings. In relatively harsher preparation conditions a ruthenium complex composed of one phenanthroline and two bis-thioethers is formed as a result of a scrambling reaction. When a bis-thioether chelate incorporated in a macrocycle also including a 6,6'-disubstituted-2,2'-bipyridine unit is used, H-1 NMR study shows that an exo S-bonded ruthenium(II) complex is obtained. In presence of chloride anions a photosubstitution reaction of the bis-thioether chelate takes place selectively and efficiently. (c) 2006 Elsevier B.V. All rights reserved.