Oxidative dimerization of Ru(III)-EDTA complex on the surface of functionalized silica gel

The present paper deals with the reaction of oxidative dimerization of the H[Ru(III)Cl-2(H(2)EDTA)]. 4.5 H2O complex on the surface of silica gel functionalized (SF) with [3-(2-aminoethyl) aminopropyl] trimethoxysilane (AEATS), generating the dimeric ( EDTA)(2)Ru-2(IV, IV) complex immobilized on the surface of this silica through the coordination with amide bonds. The oxidation of water by the anchored dimeric complex proceeded rapidly and was observed by the evolution of O-2 and the decrease in pH, yielding the SF-AEATS/(EDTA)(2)Ru-2(III1/2, III1/2). This anchored dimer was characterized by electronic, vibrational and EPR spectroscopies. The electrochemical behavior of a modified carbon paste electrode prepared with SF-AEATS/ (EDTA)(2)Ru-2(III1/2, III1/2) was also studied.