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

doi:10.7517/j.issn.1674-0475.1998.03.250

影像科学与光化学 ›› 1998, Vol. 16 ›› Issue (3): 250-257.DOI: 10.7517/j.issn.1674-0475.1998.03.250

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

贺学忠, 周亚琳, 王令萱, 黎甜楷, 张曼华, 沈涛

中国科学院感光化学研究所, 北京 100101

收稿日期:1997-12-12 修回日期:1998-02-18 出版日期:1998-08-20 发布日期:1998-08-20
通讯作者: 张曼华
基金资助:
国家自然科学基金(批准号:59573010);中国科学院有机固体开放实验室基金

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

HE Xuezhong, ZHOU Yalin, WANG Lingxuan, LI Tiankai, ZHANG Manhua

Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China

Received:1997-12-12 Revised:1998-02-18 Online:1998-08-20 Published:1998-08-20

摘要/Abstract

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.

关键词: 两亲性卟啉, 硫化镉、硫化锌, 胶体超微粒, 荧光猝灭

Abstract: 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 (TC₁₆ PyP (4)) was studied. The experimental results reveal: adding CdS, ZnS nanoparticles to a TC₁₆ PyP (4) solution, TC₁₆ PyP (4) is absorbed onto the surface of colloid nanoparticles. This absorption leads to red-shifted absorption, fluorescence emission spectra and the quenching of TC₁₆ PyP (4) s fluorescence emission. These changes are related to the formation of complex. Nearly 90% of the fluorescence emission of 5×10⁶ mol/L TC₁₆ 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 TC₁₆ PyP (4) with CdS, ZnS nanoparticles are 1.42×10³ (mol/L)^-1, 1.07×10³ (mol/L)^-1, respectively.

Key words: amphiphilic porphyrin, CdS, ZnS, colloid nanoparticles, fluorescence quenching

贺学忠, 周亚琳, 王令萱, 黎甜楷, 张曼华, 沈涛. 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[J]. 影像科学与光化学, 1998, 16(3): 250-257.

HE Xuezhong, ZHOU Yalin, WANG Lingxuan, LI Tiankai, ZHANG Manhua . PHOTOPHYSICAL PROPERTIES OF AMPHIPHILIC PORPHYRIN ABSORBED ON CdS, ZnS COLLOID NANOPARTICLES[J]. Imaging Science and Photochemistry, 1998, 16(3): 250-257.

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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

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