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

Two trinuclear Co II and Zn II complexes, [(CoL) 2 (OAc) 2 Co] and [(ZnL) 2 (OAc) 2 Zn], with an asymmetric Salen‐type bisoxime ligand [H 2 L = 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 Co II and Zn II complexes were determined by single‐crystal X‐ray diffraction methods. The Co II atom is pentacoodinated by N 2 O 2 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 Zn II atom is pentacoodinated by N 2 O 2 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 Co II and Zn II complexes were discussed.