Abstract
Abstract Three novel Zn(II) complexes, [Zn 4 L 1 Cl 4 ]·3H 2 O ( 1 ), [Zn 4 L 2 Cl 4 ]·2DMF ( 2 ) and [Zn 4 L 3 Cl 4 ]·H 2 O ( 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 Zn 2+ sensors have been investigated. Take H 4 L 1 for example, it exhibits a 4-fold fluorescence enhancement upon the addition of 2 equiv. of Zn 2+ in MeOH.
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