Synthesis and Comprehensive Characterizations of New <i>cis</i>-RuL<sub>2</sub>X<sub>2</sub> (X = Cl, CN, and NCS) Sensitizers for Nanocrystalline TiO<sub>2</sub> Solar Cell Using Bis-Phosphonated Bipyridine Ligands (L)
作者:Hervé Zabri、Isabelle Gillaizeau、Carlo Alberto Bignozzi、Stefano Caramori、Marie-France Charlot、Joan Cano-Boquera、Fabrice Odobel
DOI:10.1021/ic034403m
日期:2003.10.1
90-95% photoconversion efficiency on the MLCT band, whereas those containing the bipyridine substituted in 5,5' positions display lower efficiency (60-65%). The most efficient complex in the series is cis-RuL(2)(NCS)(2); however, its overall efficiency is about 30% lower than the analogue cis-Ru(H(2)dcb)(2)(NCS)(2) (H(2)dcb = 2,2'-bipyridine-4,4'-dicarboxylic acid) due to a lower absorbance in the red part
通式为cis-RuL(2)X(2)且L = 2,2'-联吡啶-4,4'-双膦酸,L'= 2,2'-联吡啶的几种钌配合物的制备和性质报道了-5,5′-双膦酸,且X = Cl,CN或NCS。这些配合物的合成依赖于关键中间体顺式-Ru(联吡啶双(二乙基膦酸酯膦酸酯))Cl(2)的制备。确定了硫氰酸根络合物的基态第二pK(a)值,对于cis-RuL(2)(NCS)(2)和cis-RuL'(2)(NCS)(2)分别为6.0和6.1,分别。对于这些物质,(13)C NMR和IR表明,硫氰酸根配体通过N原子与Ru结合。新的配合物相对于含有羧酸基团的类似配合物表现出蓝移的电子吸收光谱。密度泛函理论的分子轨道计算表明,联吡啶磷酸化的配体的LUMO比相应的二羧酸盐配合物具有更高的能量,硫氰酸根配体不是简单的旁观者配体,其作用是富集钌上的电子密度,但也参与其中从PiRu-NCS到Pibpy的过渡,在吸收光谱的低