Influence of different counteranions on supramolecular self-assemblies, Hirshfeld surfaces analyses and fluorescence properties of three multi-nuclear Cu(II) salamo-based complexes

摘要

Three new multi-nuclear Cu(II) complexes, [Cu-4(L)(2)(CH3OH)(2)](NO3)(2)center dot 2CH(3)OH (1), [Cu-4(L)(2)(CH3OH) (CH3CN)](ClO4)(2)center dot 2CH(3)OH (2) and [Cu-4(HL)(2)(mu(2)-Cl)(2)Cl-2(CH3CH2OH)(2)][CuCl2]center dot CHCl3 (3) have been successfully synthesized by the one-pot reaction of a bis(salamo)-based ligand H3L with Cu(NO3)(2)center dot 3H(2)O, Cu (ClO4)(2)center dot 6H(2)O and CuCl2 center dot 2H(2)O, respectively. Complexes 1 and 2 are monoclinic systems including four Cu(II) atoms with two completely deprotonated ligand (L)(3-) units, which form centrosymmetric helical molecules. Complex 3 is triclinic system including five Cu(II) atoms with two incompletely deprotonated ligand (HL)(2-) units, which forms an expanded structural molecule. Complexes 1-3 have been characterized by elemental analyses, IR, UV-Vis spectroscopy and single crystal X-ray crystallography. In addition, supramolecular interactions, Hirshfeld surfaces analyses, effects of counteranions and fluorescence properties were also investigated. (C) 2020 Elsevier Ltd. All rights reserved.