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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ruthenium complexes of 2-(2'-pyridyl)benzimidazole as photosensitizers for dye-sensitized solar cells
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Ruthenium complexes of 2-(2'-pyridyl)benzimidazole as photosensitizers for dye-sensitized solar cells

机译：2-（2'-吡啶基）苯并咪唑钌配合物作为染料敏化太阳能电池的光敏剂

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摘要

N-Alkylated carboxylic acid derivatives of 2-(2'-pyridyl)benzimidazole(pbimH)with different chain-lengths(pbim(CH),,CO_2H where n = 1-3)and their ruthenium complexes [Ru(bpy)j(pbim)](PF_6)_2 have been synthesized and characterized.2D COSY and NOESY NMR spectroscopy were used to aid the assignment of the pbim NMR spectrum.The effect of chain-length on the cyclic voltammetry(CV)was studied and the voltammetry of the parent pbimH complex was re-investigated.The ability of the carboxylic acid groups to bind to TiO_2 coated electrodes was confirmed by the observation of a symmetrical,surface-confined Ru~(III/II)wave,while the specular reflectance IR revealed a band at 1620 cm~(-1)due to the bound carboxylate(COO ...Ti)group.The efficiencies of solar cells using these sensitizers were rather low.due to the distance between the sensitizer and the surface and the inefficient coupling of the charge-separated excited state to the surface.A fall in the cell open-circuit voltage with chain length reflected this distance effect.Time-resolved luminescence spectroscopy indicated that rapid electron injection into the TiO_2 conduction band was occurring(<30 ns),but this is not fast enough to compete effectively with alternative excited state processes.
机译：链长不同的2-（2'-吡啶基）苯并咪唑（pbimH）的N-烷基化羧酸衍生物（pbim（CH）,, CO_2H其中n = 1-3）及其钌配合物[Ru（bpy）j（ pbim）]（PF_6）_2的合成和表征。利用二维COZY和NOESY NMR光谱对pbim NMR谱进行分配。研究了链长对循环伏安法（CV）的影响，通过观察对称的表面受限Ru〜（III / II）波，证实了羧酸基团与TiO_2涂层电极结合的能力，而镜面反射红外光谱显示由于结合的羧酸盐（COO ... Ti）基团在1620 cm〜（-1）处的能带。由于增敏剂与表面之间的距离以及增效剂的无效耦合，使用这些增敏剂的太阳能电池的效率较低。电荷分离的激发态到达表面。电池开路电压随链长的下降时间分辨发光光谱表明发生了快速的电子注入TiO_2导带（<30 ns），但这还不足以与其他激发态过程有效竞争。

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