N-amidothiourea based PET chemosensors for anions.
Neutral N-amidothiourea based PET anion sensors bearing a pyrene fluorophore, 1-3, were synthesized and their fluorescent response toward anions was assessed. The anion quenching and binding constants were found to be much higher than those of the corresponding PET sensors bearing a simple thiourea receptor despite a higher oxidation potential of the electron donor and a relatively longer spacer (CH(2))(3) between the signal reporter and binding receptor in 1-3. This was explained in terms of a much more substantial increase in the electron donating ability of amidothiourea upon anion binding.
Liu
Wen-Xia
WX
Department of Chemistry, College of Chemistry and Chemical Engineering, MOE Key Laboratory of Analytical Sciences, Xiamen University, Xiamen, 361005, China.
Jiang
Yun-Bao
YB