Comparative study of NS2(S-aryl) pyridine-based dithia-containing ligands with different substituent groups. Reactivity toward Cu(II) and Ru(II)

Ligands LX of the type NS2 with S-aryl substituents which incorporate the u nit 2,6-bis(thiomethyl)pyridine modified with functional groups bonded to t he aromatic moieties, either on the phenyl or on the pyridine, are produced . Electron-withdrawing groups, 3-chloro and 4-nitro, that reduce the pyridi ne basicity have been introduced. Methoxy or methoxycarbonyl substituents h ave been incorporated on the thiophenyl moieties. The comparative results f rom the reaction of these ligands with CU(ClO4)(2). 6H(2)O and [RuCl2(PPh3) (3)] have revealed that their coordination capacity has not been greatly mo dified as a result of the introduced groups. Complexes of general formulas [CU(LX)][ClO4](2), except for L5, and [RuCl2(LX)(PPh3)], have been obtained , respectively. The electronic characteristics of these complexes have been studied by cyclic voltammetry experiments. The structures of 2,6-bis[(2 ' -methoxycarbonyl)phenylthio-methyl]-4-nitropyridine (L5) and [RuCl2(L5)(PPh 3)]. 2CCl(4) have been characterized by single-crystal X-ray diffraction me thods.