Fluorescence Turn-On Sensing of Anions Based on Disassembly Process of Urea-Functionalized Poly(phenylenebutadiynylene) Aggregates
- Ryosuke Sakai ,
- Atsushi Nagai ,
- Yasuyuki Tago ,
- Shin-ichiro Sato ,
- Yoshinobu Nishimura ,
- Tatsuo Arai ,
- Toshifumi Satoh , and
- Toyoji Kakuchi
Abstract

A rationally designed poly(phenylenebutadiynylene) bearing urea functionalities (poly-1) was demonstrated to be a novel fluorescence turn-on probe for various anions. Poly-1 itself exhibits an extremely weak emission that was undetectable by the naked eye, whereas the fluorescence emission of poly-1 was significantly enhanced by the addition of anions. Based on the NMR, dynamic light scattering, and fluorescence decay measurements, the observed fluorescence turn-on response was determined to be realized by the fluorescence recovery based on the disassembly of the poly-1 aggregates, which was originally triggered by the anion recognition event at the urea units of poly-1.
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