A colorimetric sensor for Cu2+ in aqueous solution based on metal ion-induced deprotonation: deprotonation/protonation mediated by Cu2+-ligand interactions.
A Cu2+-specific colorimetric sensor of a 1,8-naphthalimide chromophore integrated with a 2-aminodiphenylamine (2-adpa)-based receptor was designed and synthesized. Sensor had high selectivity and sensitivity for Cu2+ in neutral aqueous buffer solution. The analytical detection limit (ADL) was 3.0 x 10(-7) M. Based on the Cu2+-induced deprotonation of the diarylamino "NH" moiety, the coordination mode was proposed with 1:1 stoichiometry between and Cu2+. These results opened up possibilities for the construction of novel colorimetric sensors with a red-shift absorption in a D-pi-A system.
Huang
Junhai
J
Shang Hai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China.
Xu
Yufang
Y
Qian
Xuhong
X
D003124:Colorimetry / Q000379:methods; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D008024:Ligands; D015394:Molecular Structure; D053644:Naphthalimides / Q000737:chemistry; D010655:Phenylenediamines / Q000737:chemistry; D011522:Protons; D014867:Water / Q000737:chemistry*
D008024:Ligands; D053644:Naphthalimides; D010655:Phenylenediamines; D011522:Protons; D014867:Water; D003300:Copper; C442848:2-aminodiphenylamine