Syntheses and structures of tetranuclear Zn(II) complexes with in situ generated macrocyclic Schiff base ligands: Applications in Zn2+ sensing
摘要:
Three novel Zn(II) complexes, [(Zn4LCl4)-Cl-1]center dot 3H(2)O (1), [(Zn4LCl4)-Cl-2]center dot 2DMF (2) and [(Zn4LCl4)-Cl-3]center dot H2O (3), have been synthesized and structurally characterized. In these complexes, interesting 32-membered dodecadentate macrocyclic ligands were generated in situ by '2 + 2' type condensation reactions between a tetraamine and various dialdehydes. All the complexes are isostructurally tetranuclear Zn(II) complexes, containing endogenous alkoxo and phenoxo bridges. Applications of the macrocyclic ligands as Zn2+ sensors have been investigated. Take H4L1 for example, it exhibits a 4-fold fluorescence enhancement upon the addition of 2 equiv. of Zn2+ in MeOH. (C) 2013 Yong-Shu Xie. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.