Citation: Min Na YAO, Yao Qun LI. Adsorption Behavior of a Water-soluble Porphyrin at the Glass-water Interface as Studied by Synchronous Total Internal Reflection Fluorescence Spectroscopy[J]. Chinese Chemical Letters, ;2004, 15(1): 109-111. shu

Adsorption Behavior of a Water-soluble Porphyrin at the Glass-water Interface as Studied by Synchronous Total Internal Reflection Fluorescence Spectroscopy

Min Na YAO ,
Yao Qun LI

The Key Laboratory of Analytical Sciences of MOE and Department of Chemistry, Xiamen University, Xiamen 361005

Received Date: 20 December 2002

otal internal reflection fluorescence spectroscopy (TIRF) and synchronous scanning technique were combined to study the adsorption behavior of the meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS) at the glass-water interface without any surfactant. The pH dependence of synchronous fluorescence signal at the interface was analyzed. Both unprotonated (TPPS^4-) and diprotonated (H₂TPPS^2-) forms of TPPS were observed at the interface. But the interface favored the adsorption of. The apparent estimated pK_a2 value shifted from 5.00 in the bulk solution to 2.7 at the interface. STIRF provides a good technique to study multi-component systems at the interface.
- Total internal reflection fluorescence,
- synchronous fluorescence,
- water-soluble porphyrin,
- pH dependence,
- glass-water interface
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