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A New Disubstituted Polyacetylene for the Detection of α ‐Amino Acids
Author(s) -
Zeng Qi,
Jim Cathy K. W.,
Lam Jacky W. Y.,
Dong Yongqiang,
Li Zhen,
Qin Jingui,
Tang Ben Zhong
Publication year - 2009
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200800616
Subject(s) - polyacetylene , glycine , fluorescence , amino acid , quenching (fluorescence) , detection limit , chemistry , copper , ion , imidazole , polymer chemistry , inorganic chemistry , organic chemistry , polymer , chromatography , biochemistry , physics , quantum mechanics
New imidazole‐functionalized disubstituted polyacetylene was synthesized by utilizing the postfunctional strategy. In addition, its ability to sense copper ions and α ‐amino acids by fluorescence quenching has been studied. The quenching of the fluorescence of the imidazole‐functionalized disubstituted polyacetylene was observed at a very low level of Cu 2+ (7.0 × 10 −7 mol · L −1 ). The fluorescent intensity decreased rapidly upon the increase of the concentration of the added solution of Cu 2+ . It was expected that the addition of α ‐amino acids to the solution of the polyacetylene/Cu 2+ complex could turn on the fluorescence of the polyacetylene, if α ‐amino acids could remove the copper ions from the complex. Glycine, was used for testing: upon the addition of glycine the quenched fluorescence of P1 turned on immediately. The detection limit was as low as 6.0 × 10 −5 mol · L −1 .