Mono- and di-nuclear complexes of the ligands 3,4-di(2-pyridyl)-1,2,5-oxadiazole and 3,4-di(2-pyridyl)-1,2,5-thiadiazole; new bridges allowing unusually strong metal–metal interactions

摘要: The syntheses of two new ligands, 3,4-di(2-pyridyl)-1,2,5-oxadiazole (dpo) and 3,4-di(2-pyridyl)-1,2,5-thiadiazole (dpt), are described. Complexes with palladium copper have seven-membered chelate rings coordination through the pyridine nitrogens, whereas in silver nitrate complex dpt ligand acts as a bridge between metal centres. Studies mononuclear ruthenium complexes indicate five-membered (involving donor nitrogen atoms from each ring oxadiazole or thiadiazole ring) reveal that these ligands very electron deficient possess low energy π* orbitals. Dinuclear been prepared diastereoisomers separated crystallographically characterised. Electrochemical studies remarkably strong metal–metal interactions, which also depend on stereoisomeric form. Some heterodinuclear prepared.