SYNTHESIS AND CHARACTERIZATION OF A NEW RUTHENIUM (II) DIARSINIC AQUACOMPLEX

Abstract

Ruthenium complexes are used as catalysts, energy converters, some have biological activity, among other applications. The ruthenium chemistry reserves remarkable stability when complexed with organic ligands, mainly bipyridine and tripyridine. Ruthenium polypyridine aquacomplexes have acted as excellent electrocatalysts in the conversion of organic substances, since they offer interesting patterns of binding with ruthenium. The preparation of ruthenium aquacomplexes combining tripyridine and bidentate arsine ligands is not officially described. Good advantages have been found when using ligands containing mixed mono, di or tripyridines with bidentate ligands in their coordination sphere, such as the verified stability of these complexes, without loss of ligands during the process and the possibility of better stereochemical control during the synthesis of these complexes. This work stands out the synthesis, in three stages, of a new ruthenium tripyridine complex containing a bidentate arsine: [Ru(L)(totpy)(OH2)](ClO4)2 (L=Ph2AsCH2CH2AsPh2); (totpy=4'-(4-tolyl)-2,2':6',2''-terpyridine). Each step of the synthetic route showed a significant reaction yield and the voltammetric, spectroscopic and microanalytical characterization results point positively to the proposed chemical structure of the complex.