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Fluorescent chemosensor based on the conjugated polymer incorporating 2,2′‐bipyridyl moiety for transition metal ions
Author(s) -
Miao Qian,
Huang Xiaobo,
Cheng Yaqian,
Liu Yan,
Zong LiLi,
Cheng Yixiang
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29393
Subject(s) - moiety , conjugated system , photochemistry , fluorescence , polymerization , polymer , photoinduced electron transfer , metal ions in aqueous solution , intramolecular force , quenching (fluorescence) , bipyridine , polymer chemistry , chemistry , linker , materials science , electron transfer , metal , organic chemistry , physics , quantum mechanics , computer science , crystal structure , operating system
A fluorescent conjugated polymer was synthesized by the polymerization of 1,4‐dibromo‐2,3‐bisbutoxynaphthalene ( M‐2 ) with 5,5′‐divinyl‐2,2′‐bipyridine ( M‐3 ) via Heck reaction. The conjugated polymer shows strong blue–green fluorescence because of the extended π‐electronic structure between the repeating unit 2,3‐bisbutoxynaphthyl group and the conjugated linker 2,2′‐bipyridyl (bpy = 2,2′‐bipyridine) moiety via vinylene bridge. The responsive properties of the conjugated polymer on transition metal ions were investigated by fluorescent and UV–vis spectra. The results show that Cu 2+ and Ni 2+ can form nonradiative metal‐to‐ligand charge‐transfer complexes with the polymer, whereas, Zn 2+ and Cd 2+ do not produce the pronounced differences from the polymer fluorescence and UV–vis spectra. The fluorescent quenching can probably be attributed to the intramolecular photoinduced electron transfer (PET) or photoinduced charge transfer (PCT). The results can also suggest that 2,2′‐bipyridyl moiety in the main chain backbone of the conjugated polymer can act as the recognition site of a special fluorescent chemosensor for sensitive detection of transition metal ions. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009