Interaction of Water-Soluble Tetrakis-( 1-methyl-4-pyridiniyl )-porphyrin and CdS Naonoparticles

• 来源期刊: 中国化学（英文版）
• 学科: 化学
• 年，卷（期）: 2001,（11）
• 页码范围: 1028-1032
• 页数: 5页
• 分类号: O6
• 语种: 英文

摘要

The interaction between positively charged porphyrin TMPyP(4) (tetrakis-(1-methyl-4-pyridiniyl) porphyrin) and negatively charged su-face of colloidal CdS nanoparticles has been studied by absorption spectrum, fluorescence spec troscopy, and time-correlated single-photon-counting methods. Addition of CdS colloid to a TMPyP(4) solution leads to TMPyP(4) adsorption onto the surface of CdS colloid with an apparent association constant of 4643 L/mol. This adsorption results in distinct changes in absorption spectrum of TMPyP (4) and the quenching of its' fluorescence, but the biexponential fluorescence decay changes hardly. Nearly 90% of the fluorescence of 5 × 10-6 mol/L TMPyP(4) can be quenched with 1 . 5 × 10-4 mol/L CdS colloid. These spectral changes are attributed to the formation of a certain form complex TMPyP(4)-CdS.