Highly sensitive and selective fluorescent sensor for distinguishing cadmium from zinc ions in aqueous media.
A fluorescent sensor, QA, based on acetamidoquinoline with DPA as receptor, was synthesized. In aqueous buffer solution, QA demonstrates high selectivity for sensing Cd(2+) with about 40-fold enhancement in fluorescence quantum yield and picomolar sensitivity (K(d) = 0.25 +/- 0.03 pM). Moreover, sensor QA can distinguish Cd(2+) from Zn(2+) via two different sensing mechanisms (PET for Cd(2+); ICT for Zn(2+)), and the discrimination is even possible by "naked eyes".
Xue
Lin
L
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Liu
Chun
C
Jiang
Hua
H
D002104:Cadmium / Q000032:analysis* / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D015394:Molecular Structure; D012996:Solutions; D015032:Zinc / Q000032:analysis*
D005456:Fluorescent Dyes; D012996:Solutions; D002104:Cadmium; D015032:Zinc