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New di- and tetranuclear Cu(II) complexes, [Cu 2 (HL)Cl 2 (MeOH)]·MeOH·2CH 2 Cl 2  ( 1 ) and [Cu 4 (L) 2 (MeOH) 2 ](NO 3 ) 2 ·EtOH ( 2 ), have been synthesized from CuCl 2 ·2H 2 O, Cu(NO 3 ) 2 ·3H 2 O and a symmetric 5-bromosalicylaldehyde-decorated bis(salamo)-like ligand (H 3 L, (1E,3E)-2-hydroxy-5-methylisophthalaldehyde O,O-di(2-((((E)-5-bromo-2-hydroxybenzylidene)amino)-oxy)ethyl)dioxime), and characterized by elemental analyses, IR and UV–vis spectra. Single crystal structure analyses showed a dinuclear Cu(II) structure for  1  and a tetranuclear Cu(II) structure for  2 . In  1 , two Cu(II) ions are on one side of the double N 2 O 2  cavities, and the phenol proton in the other cavity is attached. In  2 , four Cu(II) ions are located in four N 2 O 2  cavities of two fully deprotonated L 3−  units, giving a centrosymmetric double helix structure. The Hirshfeld surfaces analyses, Interaction Region Indicator (IRI), and DFT computations of H 3 L,  1 , and  2  were studied. In addition, the electrochemical and fluorescence properties of  1  and  2  were also investigated.

Synthesis, structure, theoretical studies, and fluorescence properties of two multinuclear Cu(II) bis(salamo)-like complexes