Synthesis, spectral, electrochemical and photovoltaic properties of novel heteroleptic polypyridyl ruthenium(II) donor-antenna dyes
作者:Katja Willinger、Katja Fischer、Roman Kisselev、Mukundan Thelakkat
DOI:10.1039/b901988j
日期:——
A series of new heteroleptic Ru(II)(4,4′-dicarboxylic acid-2,2′-bipyridine)(bipyridyl donor-antenna ligand)(NCS)2 complexes carrying different donor-antenna moieties was designed, synthesised and characterised. A general synthetic procedure was used for the covalent attachment of the donor-antenna units 1,3-di(2-thienyl)benzo[c]-thiophene (DTBT), trans-stilbene (tS) and 4-2-[2-(2-methoxyethoxy)ethoxy]-ethoxy}-N,N-diphenylbenzenamine (TPA-EO) to 2,2′-bipyridine. First, a Vilsmeier-Haack reaction was applied to get the respective aldehyde-functionalised donor-antenna compounds which secondly reacted with 4,4′-bis(triphenylphosphonium-methyl)-2,2′-bipyridyl chloride under Wittig conditions to give the desired bipyridyl donor-antenna molecules. To create a dimethylamino (NMe2) substituted donor-antenna compound a reaction between 4,4′-dimethyl-2,2′-bipyridine and Bredereck's reagent was carried out. The final Ru(II) complexes referred to as Ru-DTBT-NCS, Ru-tS-NCS, Ru-TPA-EO-NCS and Ru-NMe2-NCS were obtained via one-pot reactions, starting from dichloro(p-cymene)ruthenium(II) dimer. The bipyridyl donor-antenna molecules as well as the complexes were fully characterised and their optical and electrochemical properties were studied in detail. Preliminary tests of the novel Ru(II)bis(bipyridyl)(NCS)2 dyes in solid-state dye-sensitized solar cells under AM1.5G conditions (100 mW cm−2) yielded short-circuit current densities of 1.06, 2.15, 3.42 and 4.03 mA cm−2, open-circuit voltages of 625, 635, 685 and 735 mV and fill factors of about 45% corresponding to overall efficiencies of 0.31, 0.58, 0.99 and 1.37% for Ru-DTBT-NCS, Ru-NMe2-NCS, Ru-tS-NCS and Ru-TPA-EO-NCS, respectively.
我们设计、合成并表征了一系列携带不同供体-天线分子的新型杂环 Ru(II)(4,4′-二羧酸-2,2′-联吡啶)(联吡啶供体-天线配体)(NCS)2 配合物。将 1,3-二(2-噻吩基)苯并[c]-噻吩(DTBT)、反式二苯乙烯(tS)和 4-2-[2-(2-甲氧基乙氧基)乙氧基]-乙氧基}-N,N-二苯基苯胺(TPA-EO)共价连接到 2,2′-联吡啶时,采用了一般的合成程序。首先,通过 Vilsmeier-Haack 反应得到相应的醛官能化的供体天线化合物,然后在 Wittig 条件下与 4,4′-双(三苯基膦-甲基)-2,2′-联吡啶氯反应,得到所需的双吡啶供体天线分子。为了生成二甲基氨基(NMe2)取代的供体天线化合物,4,4′-二甲基-2,2′-联吡啶和布雷德克试剂发生了反应。从二氯(对苯二酚)钌(II)二聚体开始,通过一锅反应最终得到了 Ru(II)配合物,即 Ru-DTBT-NCS、Ru-tS-NCS、Ru-TPA-EO-NCS 和 Ru-NMe2-NCS。对双吡啶供体-天线分子以及配合物进行了全面表征,并详细研究了它们的光学和电化学特性。在 AM1.5G 条件(100 mW cm-2)下,在固态染料敏化太阳能电池中对新型 Ru(II)双(联吡啶)(NCS)2 染料进行了初步测试,短路电流密度分别为 1.06、2.15、3.42 和 4.03 mA cm-2,开路电压分别为 625、635、685 和 735 mV,填充因子约为 45%,Ru-DTBT-NCS、Ru-NMe2-NCS、Ru-tS-NCS 和 Ru-TPA-EO-NCS 的总效率分别为 0.31、0.58、0.99 和 1.37%。