Process for the Synthesis of Precursor Complexes of Titanium Dioxide Sensitization Dyes Based on Ruthenium Polypyridine Complexes

A process for the synthesis of precursor complexes of titanium dioxide sensitization dyes based on ruthenium polypyridine complexes comprising microwave irradiation, frequency being comprised between 300 MHz and 300 GHz, under high pressure system, pressure value being comprised between 690 and 5500 kPa (100-800 PSI) and under aqueous system, of precursor complexes and sensitizers based on carboxylic group functionalised ruthenium polypyridine complexes selected from H2dcbpy 4,4′-dicarboxy-2-2′-bipyridyl, 5,5′-dicarboxy-2,2′-bipyridyl, 4,4′,4″-tricarboxy-2,2′,6′,2″-terpyridyl, 4,4′-dinonyl-2,2′-bipyridyl, 4,4′-bis-3,4-dioctyloxystyryl-2,2′-bipyridyl, 6-phenyl-2,2′-bipyridyl, 6-(2,4-difluorophenyl)-2,2′-bipyridyl;

• and RuCl3.3(H2O)([RuCl6]2−, [Ru(DMSO)6(X)2] wherein X is selected from PF6, ClO4, Cl, Br)