A luminescent lanthanide complex-based anion sensor with electron-donating methoxy groups for monitoring multiple anions in environmental and biological processes.
We designed a ternary europium (III) tris(2-thenoyltrifluoroacetonate) with 2-(3,4,5-trimethoxyphenyl)imidazo[4,5-f]-1,10-phenanthroline (1) ligands for the luminescent detection of various anions, such as fluoride, acetate and dihydrogen phosphate. Characterization of the sensor's photophysical properties and via NMR showed that the sensor exhibits striking emission changes to fluoride (purple), acetate (green) and dihydrogen phosphate (blue) anions, respectively. Its fluorescence lifetime was determined to be 1.10 ms for europium ions and the complex showed an overall quantum yield of 10% in DMSO. Furthermore, transparent hybrid thick films composed of the europium complex and poly-methyl methacrylate matrix were successfully prepared via copolymerization. The resulting film overall displayed intense red emissions associated with europium ions. Fluorescence microscopic evaluation showed a homogenous distribution of aggregates with average diameters of 30-50 μm throughout the film. The accordingly produced film could give rise to a luminescence change to purple in response to fluoride anions.
Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
Yuhui
Y
Zheng
Chaoliang
C
Tan
Gregor P C
GP
Drummen
Qianming
Q
Wang
D000042:Absorption; D000838:Anions; D015374:Biosensing Techniques / Q000379:methods*; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D004583:Electrons; D004777:Environment; D005063:Europium / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D008856:Microscopy, Fluorescence; D019904:Polymethyl Methacrylate / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
D000838:Anions; D028581:Lanthanoid Series Elements; D005063:Europium; D019904:Polymethyl Methacrylate; D004121:Dimethyl Sulfoxide