Lifetime-Based pH Sensor System Based on a Polymer-Supported Ruthenium(II) Complex
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- 作者：Yvette Clarke ; Wenying Xu ; J. N. Demas ; and B. A. DeGraff
- 刊名：Analytical Chemistry
- 出版年：2000
- 出版时间：August 1, 2000
- 年：2000
- 卷：72
- 期：15
- 页码：3468 - 3475
- 全文大小：153K
- 年卷期：v.72,no.15(August 1, 2000)
- ISSN：1520-6882
文摘
A new luminescence lifetime-based pH sensor system isdescribed. The system is based on [Ru(Ph2phen)2DCbpy]2+(DCbpy = 4,4'-dicarboxy-2,2'-bipyridine) immobilized ina mixed domain network copolymer utilizing hydrophobicregions in a hydrophilic, water-swellable, poly(ethyleneoxide) matrix. The metal complex binds irreversibly to thehydrophobic domains leaving the pH-sensing COOHsprojecting into an aqueous-rich poly(ethylene oxide) region. The complex shows a strong pH dependence of itslifetime (3-4-fold) and provides a usable pH range ofabout 3-5. The long (~1 
s) excited-state lifetime andvisible absorption of the sensor simplifies measurements.A model for the combined pH and oxygen-quenchingsensitivity of the complex is provided; this allows use ofthe pH system over a wide range of oxygen concentrations.The combined polymer sensor is easy to prepare andrequires no covalent chemistry. Further, the polymersenhance the luminescence of the complex and minimizeinterference from oxygen quenching.
s) excited-state lifetime andvisible absorption of the sensor simplifies measurements.A model for the combined pH and oxygen-quenchingsensitivity of the complex is provided; this allows use ofthe pH system over a wide range of oxygen concentrations.The combined polymer sensor is easy to prepare andrequires no covalent chemistry. Further, the polymersenhance the luminescence of the complex and minimizeinterference from oxygen quenching.