纳米晶TiO2电极上半菁衍生物光敏染料

合成了具有不同共轭链长度的吡啶盐类及喹啉盐类半菁染料(E)-N-(4-磺酸丁基)-4-2-(4-N, N-二甲基氨基苯基)乙烯基]吡啶鎓盐(P1)、(E)-N-(4-磺酸丁基)-4-2-(4-N, N-二甲基氨基苯基)丁二烯基]吡啶鎓盐(P2)、(E)-N-(4-磺酸丁基)-4-2-(4-N, N-二甲基氨基苯基)乙烯基]喹啉鎓盐(Q1)以及(E)-N-(4-磺酸丁基)-4-2-(4-N, N-二甲基氨基苯基)丁二烯基]喹啉鎓盐(Q2).研究了它们的光物理性质，并将它们用作TiO2纳米晶电极的光敏化剂引入光电化学电池.与含有乙烯基共轭桥的染料P1和Q1相比，含有丁二烯基共轭桥的染料P2和Q2在甲醇和氯仿中的最大吸收均发生一定程度的红移，而且吸收光谱变宽.这两类染料都能很好地吸附于TiO2电极上.在比较了四个染料的吸收光谱、摩尔消光系数以及在TiO2电极表面的吸附量后，发现Q1具有最好的光电转化性质.

The Photoelectrochemical Properties of Four Hemicyanine Derivatives on Nanocrystalline TiO2 Electrode

Four hemicyanine derivatives, (E)-N-(4-sulfobutyl)-4-2-(4-N, N-dimethylamino- phenyl) ethenyl] pyridinium(P1), (E)-N-(4-sulfobutyl)-4-2-(4-N, N-dimethylaminophenyl)-1,3- butenyl]pyridinium(P2), (E)-N-(4-sulfobutyl)-4-2-(4-N,N-dimethylaminophenyl)ethenyl] quinol- inium (Q1) and (E)-N-(4-sulfobutyl)-4- 2-(4-N,N- dimethylaminophenyl)-1,3- butenyl] quinolinium(Q2), with different conjugated bridge and acceptor groups, have been synthesized and characterized with regard to their photophysical and photoelectrochemical properties. Experiments show that with extended π-conjugation bridge, the λmax of P2 and Q2 both red shifted and their absorption spectra broadened, which is advantageous for photoelectric conversion. Photoelectric properties of the four dye sensitized TiO2 electrodes were investigated in standard two-electrode system, and the data obtained show that Q1 has the best photo-to-electron conversion among the four dyes.