SUPRAMOLECULAR ASSEMBLIES IN AN UNPRECEDENTED ASYMMETRIC SALAMO-BASED DINUCLEAR NICKEL(II) COMPLEX BEARING TWO DIFFERENT COORDINATION MODES

An unprecedented dinuclear Ni(II) complex [{Ni 2 (L)(HL)(μ-OAc)(H 2 O)} 2 ]·3CH 3 CH 2 OH is successfully synthesized by the complexation of an asymmetric salamo-based ligand (H 2 L) and Ni(II) acetate tetrahydrate and characterized by elemental analyses, UV-Vis and IR spectra, and X-ray crystallography analyses. Surprisingly, in the asymmetric unit of the Ni(II) complex, a fully deprotonated ligand (L) 2– unit and a partially deprotonated ligand (HL) – unit wrapps two Ni(II) atoms, with the μ-OAc – anion bridging two adjacent Ni(II) atoms. The two Ni(II) atoms possess different coordination environments and twisted octahedral geometries. The hexacoordinated Ni(II) atom (Ni1) is located in the N 2 O 4 donor cavity, but another hexacoordinated Ni(II) atom (Ni2) is located in a NO 5 donor coordination environment. Meanwhile, a1D chain structure is formed by two N–O⋯π interactions. Hirshfeld surfaces and fluorescent properties are investigated.