高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (1): 38.

• 研究论文 • 上一篇    下一篇

基于环糊精/卟啉包络物荧光猝灭的二氧化碳光学敏感膜的研究

杨荣华, 王柯敏, 肖丹, 张留德, 羊小海   

  1. 湖南大学化学化工学院, 长沙 410082
  • 收稿日期:2000-04-07 出版日期:2001-01-24 发布日期:2001-01-24
  • 通讯作者: 王柯敏(1957年出生),男,博士,教授,博士生导师,从事光化学传感器理论与应用及纳米生物传感技术的研究.
  • 基金资助:

    国家杰出青年基金(批准号:79875110);湖南省自然科学基金(批准号:99JZY1010)资助

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

YANG Rong-Hua, WANG Ke-Min, XAIO Dan, ZHANG Liu-De, YANG Xiao-Hai   

  1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
  • Received:2000-04-07 Online:2001-01-24 Published:2001-01-24

摘要: 全-(2,6-二-O-异丁基)-β-环糊精(DOB-β-CD)对固定于增塑PVC膜中的meso-四(4-甲氧基苯基)卟啉(TMOPP)有明显的荧光增强效应,且该荧光可被溶液中的二氧化碳可逆猝灭.本文据此研制了一种可用于测定水溶液中二氧化碳含量,即[H2CO3]浓度的荧光敏感膜.研究了最佳膜的组成.经过组成优化的敏感膜测定[H2CO3]浓度的范围为4.75×10-7~3.9×10-5mol/L.该传感器响应迅速、重现性好,常见的离子无明显干扰.

关键词: 荧光猝灭, 环糊精, 卟啉, 二氧化碳, 光极膜

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

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