An Optode Membrane for CO2 Based on Fluorescence Quenching of the Inclusion Complex of Cyclodextrin and Porphyrin

Abstract

Abstract: Heptakis(2,6-di-O-isobutyl)-β-cyclodextrin(DOB-β-CD) is able to increase the fluorescence of meso-tetra(4-methoxylphenyl)porphyrin(TMOPP) immobilized in plasticized PVCmembrane, and the fluorescence is quenched by carbon dioxide in aqueous solution. Based on this mechanism, a fluorescence sensing membrane has been developed for the determination of carbon dioxide in aqueous solution. The optimal membrane consists of 2 mg of TMOPP, 8 mg of DOB-β-CD, 50 mg of PVCand 100 mg of bis(2-ethylhexyl)sebate (DOS). With the optimal condition described, carbon dioxide in solution from 475×10^-7 to 39×10^-5 mol/Lcan be determined. Besides a high reproducibility of the optical signals, the very short response time less than 30s is realized. The sensor exhibits a good selectivity over some common ions.

Key words: Fluorescence quenching, Cyclodextrin, Porphyrin, Carbon dioxide, Optode membrane

CLC Number:

O657.3

TrendMD:

YANG Rong-Hua, WANG Ke-Min, XAIO Dan, ZHANG Liu-De, YANG Xiao-Hai . An Optode Membrane for CO₂ Based on Fluorescence Quenching of the Inclusion Complex of Cyclodextrin and Porphyrin[J]. Chem. J. Chinese Universities, 2001, 22(1): 38.

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An Optode Membrane for CO₂ Based on Fluorescence Quenching of the Inclusion Complex of Cyclodextrin and Porphyrin

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