Chronoamperometric study and X-ray analysis of Ru(II)-pdto (1,8-bis-(2-pyridyl)-3,6-dithiaoctane) complexes with substituted 1,10-phenanthrolines

This work presents cyclic voltammetry and double potential step chronoamperometry experiments corresponding to the electrochemical reduction of the substituted 1,10-phenanthroline ligands in the coordination compounds [Ru(pdto)(1,10-phenanthroline)]Cl2 (1), [Ru(pdto)(5,6-dimethyl-1,10-phenanthroline)]Cl2 (2), [Ru(pdto)(4,7-diphenyl-1,10-phenanthroline)]Cl2 (3), [Ru(pdto)(4,7-dimethyl-1,10-phenanthroline)]Cl2 (4) and [Ru(pdto)(3,4,7,8-tetramethyl-1,10-phenanthroline)]Cl2 (5). These studies were performed in order to evaluate the stability of the electrogenerated chemical species. An ECi mechanism for all the complexes was proposed and the rate constant value (k1) for the chemical coupled reaction was estimated. The stability is discussed in terms of the rate constant value (k1) and the π*-acceptor properties.

Graphical abstractThis work presents cyclic voltammetry and chronoamperometry experiments for the complexes [Ru(pdto)(L)]Cl2, L = substituted 1,10-phenanthroline ligands. An ECi mechanism was proposed. The complex stability is discussed in terms of the rate constant value for the chemical coupled and the π*-acceptor properties.Figure optionsDownload full-size imageDownload as PowerPoint slide