Imaging Science and Photochemistry ›› 1998, Vol. 16 ›› Issue (3): 250-257.DOI: 10.7517/j.issn.1674-0475.1998.03.250

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

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

  1. 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

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