Effect of MCl2 (M=Hg, Zn, Cu) subphase on photoinduced electron transfer in a pyrazinium styryl dye Langmuir–Blodgett film
作者:Jie Zheng、Fuyou Li、Xiaofen Yu、Chun-Hui Huang、Nianzhu Wu
DOI:10.1039/b002087g
日期:——
An
amphiphilic heteroaromatic styryl dye, 2-(4-dihexadecylaminostyryl)-1,5-dimethylpyrazinium iodide (I) was
synthesized. Its LangmuirâBlodgett films fabricated from different subphases, namely pure water (Ia),
10â5 M CuCl2 (Ib), 10â5 M ZnCl2 (Ic) and 10â5 M HgCl2 (Id), were characterized by UV-Vis spectra and
XPS measurements. The photoelectrochemistry of these film-modified conducting transparent indiumâtin oxide (ITO)
electrodes was investigated on a traditional three-electrode cell. The experimental data indicated that the
films fabricated from different subphases have distinctive photoelectric responses. Under ambient conditions (0.5
M KCl), the quantum yields of photoelectric conversion were 0.03, 0.05, 0.06, and 0.1% for films Ia, Ib, Ic
and Id, respectively. The effects of factors such as bias voltage, methylviologen (MV2+), and hydroquinone
(H2Q) on the photocurrent generation were also investigated. Based on the experimental
data,
a possible mechanism
of photoinduced electron transfer in this system is proposed.
合成了一种两性杂芳香族苯乙烯基染料--2-(4-十六烷基氨基苯乙烯基)-1,5-二甲基吡嗪鎓碘化物(I)。通过紫外-可见光谱和 XPS 测量,对从不同子相(即纯水 (Ia)、10â5 M CuCl2 (Ib)、10â5 M ZnCl2 (Ic) 和 10â5 M HgCl2 (Id))制备的 LangmuirâBlodgett 薄膜进行了表征。在传统的三电极电池上研究了这些薄膜改性导电透明氧化铟锡(ITO)电极的光电化学性质。实验数据表明,由不同子相制得的薄膜具有不同的光电响应。在环境条件(0.5 M KCl)下,薄膜 Ia、Ib、Ic 和 Id 的光电转换量子产率分别为 0.03、0.05、0.06 和 0.1%。此外,还研究了偏置电压、甲基viologen(MV2+)和对苯二酚(H2Q)等因素对光电流产生的影响。根据实验数据,提出了该系统中光诱导电子转移的可能机制。