Design of a semirigid molecule as a selective fluorescent chemosensor for recognition of Cd(II).
A new 8-hydroxyquinoline-based chemosensor possessing a semirigid structure was designed, and its fluorescent sensing behavior toward metalions was investigated. A prominent fluorescence enhancement only for Cd(2+) was found in aqueous methanol solution. The results clearly suggest that the specific semirigid structure could selectively accommodate Cd(2+) according to ionic radius, which would effectively suppress the intramolecular radiationless transitions from the n pi* state to enhance the fluorescence response.
Tang
Xiao-Liang
XL
College of Chemistry and Chemical Engineering and State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China.
Peng
Xiao-Hong
XH
Dou
Wei
W
Mao
Jie
J
Zheng
Jiang-Rong
JR
Qin
Wen-Wu
WW
Liu
Wei-Sheng
WS
Chang
Jin
J
Yao
Xiao-Jun
XJ
D002104:Cadmium / Q000032:analysis / Q000737:chemistry*; D002413:Cations, Divalent; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D008958:Models, Molecular; D010069:Oxadiazoles / Q000737:chemistry; D015125:Oxyquinoline / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods; D013816:Thermodynamics
D002413:Cations, Divalent; D005456:Fluorescent Dyes; D010069:Oxadiazoles; D002104:Cadmium; D015125:Oxyquinoline