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A homo-dinuclear Cu(II) complex [Cu2(L)2] with the stoichiometric ratio of Cu(II) : (L)2– = 2 : 2 was synthesized by the reaction of the ligand (4-methyl-6-aldehyde-6′-methoxy-2,2′-[ethylenediyldioxybis(nitrilomethylidyne)]diphenol) with Cu(OAc)2·H2O in the mixed CH2Cl2–MeOMe–EtOH solution (an unexpected ligand is the intermediate of condensation reaction of starting ligand with acetone). The Cu(II) complex was characterized by elemental analysis, IR, UV-Vis and X-ray crystallography. The Cu(II) complex crystallizes in monoclinic space group P21/n and consists of two Cu(II) atoms and two completely deprotonated ligand (L)2– units. Through the analysis of intermolecular interactions, the Cu(II) complex units can form a 2D supramolecular structure through intermolecular hydrogen bonds and C–H···π interactions, respectively, meanwhile, the molecular interactions were quantitatively studied by Hirshfeld surfaces analyses. The fluorescence properties and DFT calculations were performed. [ABSTRACT FROM AUTHOR]

Two new trinuclear Ni(II) complexes, [{Ni(L)(DMF)(μ-OAc)}2Ni] (1) and [{Ni(L)(EtOH)(μ-OAc)}2Ni]·2CH2Cl2 (2), have been successfully synthesized from a new asymmetric salamo-based hexa-dentate chelating ligand (H2L) and Ni(OAc)2·4H2O, and characterized by elemental analysis, IR and UV-Vis spectra, and X-ray crystallography. The binding ratio of H2L and Ni(II) ion has been confirmed by UV-Vis titration. All Ni(II) atoms are hexa-coordinated, and the complexes have octahedral configuration, though with difference in the solvent molecules (DMF/EtOH) involved in the coordination, composition of the hydrogen bond and chemical stability. This conclusion is confirmed by Hirshfeld surfaces analyses and Density Functional Theory (DFT). [ABSTRACT FROM AUTHOR]