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Interaction of water‐soluble tetrakis‐(1‐methyl‐4‐pyridiniyl)‐porphyrin and CdS naonoparticles
Author(s) -
Tian ChunHong,
He XueZhong,
Shen Tao
Publication year - 2001
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20010191104
Subject(s) - chemistry , porphyrin , colloid , fluorescence , adsorption , photochemistry , quenching (fluorescence) , absorption (acoustics) , absorption spectroscopy , nanoparticle , fluorescence spectroscopy , inorganic chemistry , nanotechnology , physics , materials science , quantum mechanics , acoustics
The interaction between positively charged porphyrin TMPyP(4) (tetrakis‐(1‐methyl‐4‐pyridiniyl) porphyrin) and negatively charged surface of colloidal CdS nanoparticles has been studied by absorption spectrum, fluorescence spectroscopy, 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.