Two new for Ru: Unprecedented RuII sensitizers are coordinated by two tridentate ligands, a tricarboxyterpyridine, and a dianionic bis(pyrazolyl)pyridine derivative with an extended π-conjugated auxochrome (see picture, Ru magenta, N blue, O red, F green, S yellow, C gray). This new generation of thiocyanate-free RuII sensitizers offers solar conversion efficiency in dye-sensitized solar cells up to η=10.7 %.
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