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m-X2Bis (2, 2,-bipyridyl-4, 4/-dicarboxylate) ruthenium (II) complexes (X= Ch, Br, I-, CN-, and SCN-) were prepared and characterized with respct to their absorption, luminescence, and redox behavior. They act as efficient charge-transfersensitizers for nanocrystalline Ti02 films (thickness 8-12 pm) of very high internal surface area (roughness factor ca. 1000), prepared by sintering of 15-30-nm colloidal titania particles on a conducting glass support. The performance of c/j-di (thiocyanato) bis (2, 2'-bipyridyl-4, 4'-dicarboxylate) ruthenium (II)(1) was found to be outstanding and is unmatched by any other known sensitizer. NanocrystallineTi02 films coated with a monolayer of 1 harvest visible light very efficiently, their absorption threshold being around 800 nm. Conversion of incident photons into electric current is nearly quantitative over a large spectral range. These films were incorporated in a thin-layer regenerative …