“…Moreover, they show a good solubility in several solvents. N719, 113,177 N3, 35,104 C106, 144 Z907 89 are some dyes of this category. Carboxylate polypyridyl Ru dyes, phosphonate Ru dyes, and polynuclear bipyridyl Ru dyes are three subclasses of this dye class.…”