title: A Highly Selective and Sensitive Fluorescent Turn-on Probe for Al3+Based on Naphthalimide Schiff Base.
abstract: A simple and highly selective aluminium ion fluorescent probe (N-n-butyl-4-[3,3'-((2-aminoethyl)azanediyl)bis(N'-(2-hydroxy-3-methoxybenzylidene)-propanehydrazide)]-1,8-naphthalimide) (P-1) employing 1,8-naphthalimide as the fluorophore group and Schiff base as the recognition group has been successfully synthesized and systemically characterized. The structure of probe P-1 has been established by single crystal X-ray. The photophysical properties of probe P-1 revealed that the values of the fluorescence quantum yield are higher in non-polar solvents than in polar solvents. Compared with the free P-1, the fluorescence intensity of P-1 shows a significant fluorescence enhancement in the presence of Al3+without any significant interference from other cations and anions. In addition, from the UV-vis titration, fluorescence titration,Job's plot and1H NMR spectra analysis, we could primarily confirm that three important coordinative sites of P-1 for Al3+were from imine nitrogen and tertiary amine nitrogen and formed a 1:1 complex. The fluorescence intensity for the (P-1) showed a good linearity with the concentration of Al3+in the range of 3.0-10.0 μM, with a detection limit of 8.65 × 10-8M and a binding constant (Kb) of 4.95 × 104M-1. It is worthy of note that the probe P-1 was successfully applied in detection of Al3+in Yellow River and tap water samples.
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, People's Republic of China.
authors.forename: Hongping
authors.initials: H
authors.lastname: Peng
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, People's Republic of China.
authors.forename: Kesheng
authors.initials: K
authors.lastname: Shen
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, People's Republic of China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Mao
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, People's Republic of China.
authors.forename: Xinkui
authors.initials: X
authors.lastname: Shi
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, People's Republic of China.
authors.forename: Yuling
authors.initials: Y
authors.lastname: Xu
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, People's Republic of China.
authors.forename: Stephen Opeyemi
authors.initials: SO
authors.lastname: Aderinto
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, People's Republic of China. wuhuilu@163.com.
authors.forename: Huilu
authors.initials: H
authors.lastname: Wu
keywords: 1,8-Naphthalimide; Aluminium ion; Fluorescent probe; Schiff base