Single-armed salamo-like dioxime and its multinuclear Cu (II), Zn (II) and Cd (II) complexes: Syntheses, structural characterizations, Hirshfeld analyses and fluorescence properties

Three multinuclear Cu (II), Zn (II) and Cd (II) complexes, [Cu-2(L)(mu-OAc)]center dot CHCl2 (1), [Zn-2(L)(mu-OAc)(H2O)]center dot 3CHCl(3) (2) and [{Cd-2(L)(OAc)(CH3CH2OH)}(2)]center dot 2CH(3)CH(2)OH (3) with a single-armed salamo-like dioxime ligand H3L have been synthesized, and characterized by FT-IR, UV-vis, X-ray crystallography and Hirshfeld surfaces analyses. The ligand H3L has a linear structure and C-H center dot center dot center dot pi interactions between the two molecules. The complex 1 is a dinuclear Cu (II) complex, Cu1 and Cu2 are all five-coordinate possessing distorted square pyramidal geometries. The complex 2 also forms a dinuclear Zn (II) structure, and Zn1 and Zn2 are all five-coordinate bearing distorted trigonal bipyramidal geometries. The complex 3 is a symmetrical tetranuclear Cd (II) complex, and Cd1 is a hexa-coordinate having octahedral configuration and Cd2 is hepta-coordinate with a pentagonal bipyramidal geometry, and it has pi center dot center dot center dot pi interactions inside the molecule. In addition, fluorescence properties of the ligand and its complexes 1-3 have also been discussed.