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Polythiophene based fluorescent probe for copper ions with high sensitivity
Author(s) -
Guo Chaoxia,
Jiang Shouxiang,
Zhu Wenxue,
Yang Xiuxia,
Pei Meishan,
Zhang Guangyou
Publication year - 2015
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.42440
Subject(s) - metal ions in aqueous solution , fluorescence , thiophene , steric effects , polythiophene , copper , chelation , polymer , selectivity , ion , metal , denticity , ligand (biochemistry) , conjugated system , chemistry , materials science , polymer chemistry , inorganic chemistry , conductive polymer , stereochemistry , organic chemistry , quantum mechanics , catalysis , biochemistry , physics , receptor
Two new conjugated polymers poly{3‐({4‐[(2‐hydrazino‐2‐oxoethyl)(methyl)amino]cyclohexylidene}methyl)thiophene}( P1 ) and poly{3‐({4‐[(3‐hydrazino‐3‐oxopropyl)(methyl)amino]cyclohexylidene}methyl)thiophene}( P2 ) were synthesized, and their optical properties were investigated. P1 exhibited excellent selectivity toward Cu 2+ ions in 50% water solution, the fluorescence color of P1 changed distinctly from greenyellow to colorless in the presence of Cu 2+ under UV‐light, while introduction of other metal ions could not induce such significant variation. Moreover, highly sensitive detection of Cu 2+ ions was demonstrated in 90% water solution. Its high metal‐chelating capability allowed Cu 2+ recognition with a detection limit of 3.2 × 10 −10 M. These results indicated that this kind of nonionic polymer containing multidentate ligand could be used as a highly selective and sensitive chemosensor for Cu 2+ detection. The proposed binding mode of P1 with Cu 2+ was supported by DFT calculation using Gaussian 03. Unlike P1 , P2 showed no obvious fluorescent change in the presence of various metal ions due to its space steric hindrance resulted from N/O distribution on the side chain of P2 . © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42440.