The β-diketonato Ru(II)-polypyridyl complexes, Ru(4,4′,4″-tricarboxy-2,2′:6′,2″-terpyridine)(1,1,1-trifluoropentane-2,4-dionato)(NCS) and Ru(4,4′,4″-tricarboxy-2,2′:6′,2″-terpyridine)(1,1,1-trifluoroeicosane-2,4-dionato)(NCS), when anchored to nanocrystalline TiO2 films, achieve very efficient panchromatic sensitization over the whole visible range extending into the near IR region, yielding 70% incident photon to current conversion efficiencies (IPCE). The presence of long hydrocarbon substituents on the β-diketonato ligand helps to prevent surface aggregation of the sensitizer.
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Islam et al. (2002) studied this question.
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