Selective optode for o-mononitrophenol based on fluorescence quenching of a conjugated polymer

• Published in: Analytica chimica acta Vol. 439; no. 1; pp. 55 - 63
• Main Authors: Huang, Hong-Mei, Wang, Ke-Min, Xiao, Dan, Yang, Rong-Hua, Yang, Xiao-Hai
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 17.07.2001; Elsevier
• Subjects: Analytical chemistry; Chemistry; Exact sciences and technology; Fluorescence quenching; General, instrumentation; o-NTP; Optode; PDPA; PDPA; Optode; o-NTP; Fluorescence quenching; Performance evaluation; Nitro compound; Fluorescence detector; Interelement effect; Chemical sensor; Environmental control; Chemical pollution; Chemical equilibrium; Conjugated polymer; Environmental materials; Luminescence quenching; Benzenic compound; Polyvinyl chloride
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/S0003-2670(01)01020-0

A Selective optode for o-mononitrophenol has been developed based on fluorescence quenching of a conjugated polymer — poly(2,5-dimethoxy-phenyldiacetylene) (PDPA) (399 nm/446 nm), which was incorporated in a plasticized poly(vinyl chloride) (PVC) membrane. Conjugated π-electrons of PDPA exhibits high lipophilicity, intense fluorescence and other collective properties different from small molecule element. It can be used as a sensing material (probe) to indicate the presence of an electron-poor analyte. Compared with those small molecules as sensing materials incorporated in optode, PDPA shows improving stability in PVC membrane. With the optimum condition described, o-NTP can be determined from 1.8×10 −6 to 1.8×10 −3 mol l −1. The response time of the sensor is within 1.0 min. In addition to the high reversibility of the fluorescence signal, the sensor also exhibits good selectivity over other nitrophenols and common ions except for Hg 2+.