Trinuclear Cobalt(II) and Zinc(II) Salamo‐type Complexes: Syntheses, Crystal Structures, and Fluorescent Properties

Abstract

AbstractTwo trinuclear CoII and ZnII complexes, [(CoL)2(OAc)2Co] and [(ZnL)2(OAc)2Zn], with an asymmetric Salen‐type bisoxime ligand [H2L = 4‐(N,N‐diethylamine)‐2,2′‐[ethylenediyldioxybis(nitrilomethylidyne)]diphenol] were synthesized and characterized by elemental analyses, IR, UV/Vis, and fluorescent spectroscopy. The crystal structures of the CoII and ZnII complexes were determined by single‐crystal X‐ray diffraction methods. The CoII atom is pentacoodinated by N2O2 donor atoms from the (L)2– unit and one oxygen atom from the coordinated acetate ion, resulting in a trigonal bipyramid arrangement. With the help of intermolecular hydrogen bonding C–H···O and C–H···π interactions, a self‐assembled continual zigzag chain‐like supramolecular structure is formed. The ZnII atom is pentacoodinated by N2O2 donor atoms from the (L)2– unit and one oxygen atom from the coordinated acetate ion, resulting in an almost regular trigonal bipyramid arrangement. A self‐assembled continual 1D supramolecular chain‐like structure is formed by intermolecular hydrogen bonding C–H···O and C–H···π interactions. Additionally, the photophysical properties of the CoII and ZnII complexes were discussed.