Tetranuclear Zn(II) Complex Based on an Asymmetrical Salamo‐Type Chelating Ligand: Synthesis,Structural Characterization,and Fluorescence Property

A new tetranuclear Zn(II ) complex, [{Zn(L)(μ‐OAc )Zn(H₂O )}₂], based on an asymmetrical salamo‐type bisoxime chelating ligand H₃L (6‐hydroxy‐4′‐chloro‐2,2′‐[ethylenediyldioxybis(nitrilomethylidyne)]diphenol) was synthesized and characterized by elemental analyses, differential thermal methods, single‐crystal X‐ray crystallography, and IR , UV –vis, and fluorescence spectra. The Zn(II ) complex crystallizes in the triclinic system, space group P ‐1 with cell parameters a = 9.0742(6) Å, b = 11.8225(5) Å, c = 12.4182(8) Å, Z = 2, V = 1212.56(12) ų , R ₁ = 0.0572, and wR ₂ = 0.1734. The environment of the tetranuclear Zn(II) complex is penta‐coordinated having a slightly distorted trigonal bipyramidal geometry. Moreover, a 1D chain supramolecular structure is formed along the c ‐axis by the intermolecular C1–H1B⋯O14 hydrogen bonds; in the same manner, C2–H2C⋯Cg2 functions in the formation of supramolecular structures along the a ‐axis of the 1D chain. A 2D supramolecular structure along the ac plane extends infinitely under the force of intermolecular hydrogen bonds. Differential scanning calorimetry‐thermogravimetry thermal analysis provides evidence of the coordination of Zn(II) atoms to the ligand H₃L. The Zn(II) complex shows intense photoluminescence with a maximum emission at ~453 nm upon excitation at 360 nm.