[NBu4]2n[cis-Ru(H2−ndcpq)2(NCS)2]
{n = 0 or 1; H2dcpq = 4-carboxy-2-[2′-(4′-carboxypyridyl)]quinoline} were newly synthesized, and their photophysical and photovoltaic properties were characterized and compared with those of [NBu4]2n[cis-Ru(H2−ndcbiq)2(NCS)2]
(H2dcbiq = 4,4′-dicarboxy-2,2′-biquinoline) and [NBu4]2n[cis-Ru(H2−ndcbpy)2(NCS)2]
(H2dcbpy = 4,4′-dicarboxy-2,2′-bipyridine). The lowest
excited-state oxidation potential of cis-[Ru(H2dcpq)2(NCS)2] was estimated to be −0.72 V vs. SCE, which was more positive than that of cis-[Ru(H2dcbpy)2(NCS)2], and very close to reported values of the conduction band edge of TiO2. [NBu4]2n[cis-Ru(H2−ndcpq)2(NCS)2] achieved efficient sensitization of nanocrystalline TiO2 films over a wide visible and near-infrared wavelength range, generating a large short-circuit photocurrent of 13.2 mA cm−2 and an open-circuit voltage of 0.53 V with a solar energy conversion efficiency of 5.0% under simulated AM 1.5 solar irradiation (100 mW cm−2).
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