Toma, Henrique E.Santos, Paulo S.Mattioli, Maria P.D. [UNESP]Oliveira, Luiz A.A. [UNESP]2014-05-272014-05-271987-12-01Polyhedron, v. 6, n. 3, p. 603-611, 1987.0277-5387http://hdl.handle.net/11449/63822The chemistry of the pentadentate edta complexes of ruthenium(III) and (II) with 2-mercaptopyridine (HSpy) has been investigated based on spectroscopic, kinetic and electrochemical techniques. The reaction of [Ru(III)(edta)H2O]- with HSpy proceeds with a specific rate of 1.05 × 104 M-1 S -1 (25°C, I = 0.10 M, acetate buffer), forming a red complex (λmax = 550 nm) which undergoes a relaxation process as a function of pH, with an apparent pKa = 4.35 and kobs = 0.31 S -1. The second reaction depends on the concentration of HSpy and leads to a stable green product (λmax = 630 mn). A pronounced enhancement has been observed in the Raman spectra of the complexes, particularly in the region of the metal-ligand vibrations. The electronic and resonance Raman spectra are consistent with the coordination of HSpy via the sulfur atom in the red complex, and with a chelate binding in the green species. © 1987.603-611engArtigo10.1016/S0277-5387(00)81031-1Acesso restrito2-s2.0-0000060272