Detection of Zn(II) ions by fluorescent pyrene-derived molecular probes

作者：Manandhar Erendra; Cragg Peter J^*; Wallace Karl J

来源：Supramolecular Chemistry, 2014, 26(3-4): 141-150.

DOI：10.1080/10610278.2013.835050

• zinc
• pyrene
• excimers
• fluorescence sensors
• DFT

Two pyrene-based molecular probes have been synthesised from ortho- and meta-bis(azidodimethyl)benzene and their coordination with Fe(III), Al(III), Fe(II), Zn(II), Ni(II), Cu(II), Cd(II), Hg(II), Ca(II), Mg(II) and Na(I) cations is described. The greatest spectral changes were observed with Zn(II) salts, which are important analytical targets in environmental and biological chemistry, and a detailed investigation on the influence of the counter-ion (F-, Cl-, Br-, I-, ,ClO4-, NO3-, CH3CO2-, SO42- and BF4-) was undertaken. Density functional theory studies suggest that Zn(II) is bound in the cleft of the probes in a 1:1 host:guest ratio. A significant hypsochromic shift is observed in the excimer band in the presence of metal salts and is greatest upon the addition of Zn(ClO4)(2).The limit of Zn(II) detection is in the nanomolar range for the meta-isomer and the binding process is reversible allowing the system to be recycled several times. A protocol is proposed that would allow detection of Zn(II) in aqueous samples.

• 出版日期2014-3-18