吸附在CdS,ZnS两种超微粒上的两亲性卟啉光物理性质的研究  

PHOTOPHYSICAL PROPERTIES OF AMPHIPHILIC PORPHYRIN ABSORBED ON CdS,ZnS COLLOID NANOPARTICLES

作　　者：贺学忠[1] 周亚琳[1] 王令萱[1] 黎甜楷[1] 张曼华[1] 沈涛[1] 

机构地区：[1]中国科学院感光化学研究所

出　　处：《感光科学与光化学》1998年第3期250-257,共8页Photographic Science and Photochemistry

基　　金：国家自然科学基金;中国科学院有机固体开放实验室基金

摘　　要：研究了ＣｄＳ、ＺｎＳ两种超微粒对两亲性卟啉５，１０，１５，２０－四－（４－Ｎ－十六烷基吡啶基）卟啉溴化物（ＴＣ１６ＰｙＰ（４））的光物理性质（吸收光谱，荧光光谱，荧光寿命）的影响．结果表明：在ＴＣ１６ＰｙＰ（４）的甲醇溶液中加入ＣｄＳ、ＺｎＳ两种胶体超微粒后，ＴＣ１６ＰｙＰ（４）吸附在胶体超微粒表面上，其吸收光谱和荧光光谱发生红移；其荧光明显地被猝灭．这些变化与卟啉在两种纳米粒子表面形成复合物有关，荧光猝灭过程以静态猝灭为主．在５×１０－６ｍｏｌ／Ｌ的ＴＣ１６ＰｙＰ（４）甲醇溶液中分别加入６．８×１０－４ｍｏｌ／Ｌ、８．１×１０－４ｍｏｌ／Ｌ的ＣｄＳ、ＺｎＳ两种超微粒后，其荧光猝灭效率都达到９０％以上．通过荧光猝灭曲线计算得ＴＣ１６ＰｙＰ（４）与ＣｄＳ、ＺｎＳ两种超微粒之间表观结合常数分别为１．４２×１０３（ｍｏｌ／Ｌ）－１、１．０７×１０３（ｍｏｌ／Ｌ）－１．The effect of CdS, ZnS colloid nanoparticles on the photophysical properties( absorption spectra, fluorescence spectra and fluorescence lifetimes) of amphiphilic porphyrin 5, 10, 15, 20 tetrakis (4 N hexadecylpyridiniumyl) porphyrin (TC 16 PyP(4)) was studied. The experimental results reveal: adding CdS, ZnS nanoparticles to a TC 16 PyP(4) solution, TC 16 PyP(4) is absorbed onto the surface of colloid nanoparticles. This absorption leads to red shifted absorption, fluorescence emission spectra and the quenching of TC 16 PyP(4)s fluorescence emission. These changes are related to the formation of complex. Nearly 90% of the fluorescence emission of 5×10 6 mol/L TC 16 PyP(4) can be quenched with 6.8×10 -4 mol/L CdS colloid nanoparticle or 8.1×10 -4 mol/L ZnS colloid nanoparticle. According to the fluorescence quenching curves, the apparrent association constant of TC 16 PyP(4) with CdS, ZnS nanoparticles are 1.42×10 3(mol/L) -1 , 1.07×10 3(mol/L) -1 , respectively.

关 键 词：两亲性 卟啉 硫化镉 硫化锌 半导体 敏化 超微粒 

分 类 号：TN304.2[电子电信—物理电子学] O626.13[理学—有机化学]