摘要 : In this work, cyclometalated iridium(III) complexes were synthesized, presenting a general formula [Ir(ppy)2(N N)]PF6, where ppy=2-phenylpyridine or 2-(2,4-difluorophenyl)pyridine and NN=4,4’-bis(diethylphosphonate)-2,2’-bipyridin... 展开 In this work, cyclometalated iridium(III) complexes were synthesized, presenting a general formula [Ir(ppy)2(N N)]PF6, where ppy=2-phenylpyridine or 2-(2,4-difluorophenyl)pyridine and NN=4,4’-bis(diethylphosphonate)-2,2’-bipyridine or 4,4’-bis (carboxy)-2,2’-bipyridine. The complexes were characterized by 1H-NMR, ~(13)C-NMR ~(31)P-NMR and UV-Vis spectroscopy. The assembled Dye Sensitized Solar Cells were characterized by current versus potential curves and by photon-to-current conversion efficiency measurements. The complexes present intense absorption bands in the UV region (250–350 nm), which are assigned to symmetry allowed singlet 1LC ππ? transitions involving both phenylpyridyl and bipyridyl ligands. At longer wavelengths (350-450 nm) the weaker absorption bands are related to transitions with mixed metal-to-ligand and ligand- to-ligand charge transfer character. Dye desorption measurements revealed that the phosphonate group provide a more stable anchoring than the carboxylate. The most efficient devices were obtained by using iridium complexes with carboxylate anchoring groups. 收起