title: Ratiometric and selective fluorescent sensor for Zn2+ as an "off-on-off" switch and logic gate.
abstract: A new chemosensor, 2,3,15,16-tetrakis(pyridin-2-yl)-7,8,10,11,20,21,23,24-octahydro[1,4,7,10,13,16]hexaoxacyclooctadecino[2,3-g:11,12-g']diquinoxaline (1), containing 2,3-bis(pyridin-2-yl)quinoxaline and crown ether moieties, has been designed and found to be a ratiometric and selective fluorescent detector of Zn(2+) over a wide range of tested metal ions. The addition of Zn(2+) to the solution of 1 in acetonitrile induced the formation of a 1:2 ligand-metal complex, 1-Zn(2+), which exhibits a remarkable enhanced fluorescent emission centered at 460 nm, with the disappearance of the fluorescent emission of 1 centered at 396 nm due to the mechanism of internal charge transfer. In contrast, the presence of K(+) results in the fluorescence quenching of 1 and 1-Zn(2+) through the photoinduced electron-transfer mechanism. These results demonstrate that 1 can perform as not only an INHIBIT logic gate but also an "off-on-off" molecular switch triggered by Zn(2+) and K(+). The structure of complex 1-Zn(2+) has been characterized by single-crystal X-ray crystallography, mass spectrometry, and (1)H NMR titration experiments. Density functional theory calculation results on 1 and the 1-Zn(2+) complex are well consistent with the experimental results.
authors.affiliation: Tianjin Key Lab on Metal and Molecule-based Material Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China.
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Li
authors.forename: Hua-Rong
authors.initials: HR
authors.lastname: Yang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhao
authors.forename: Wei-Chao
authors.initials: WC
authors.lastname: Song
authors.forename: Jie
authors.initials: J
authors.lastname: Han
authors.forename: Xian-He
authors.initials: XH
authors.lastname: Bu