Luminescent and electrochemical properties of four novel butterfly-shaped hetero-pentanuclear [Zn4Ln] complexes constructed from a bis(salamo)-type ligand

Four novel butterfly-shaped hetero-pentanuclear 3d-4f complexes [Zn-4(L)(2)Sm(H2O)(4)]3NO(3)center dot 2EtOH (1) [Zn-4(L) Eu-2(NO3)(2)(MeOH)(EtOH)]NO3 center dot H2O (2), [Zn-4(L)(2)Gd(H2O)(4)]3NO(3)center dot MeOH center dot EtOH (3) and [Zn-4(L)(2)Tb(NO3) (EtOH)(H2O)(2)]NO3 center dot MeOH center dot EtOH (4) were synthesized by the reactions of a bis(salamo)-type tetraoxime ligand (H4L) with Zn(OAc)(2)center dot 2H(2)O and Ln(NO3)(3)center dot 6H(2)O (Ln = Sm, Eu, Gd and Tb), respectively. The structures of complexes 1-4 were fully characterized by elemental analyses, FT-IR, UV-Vis spectroscopy and single crystal X-ray crystallography, and their luminescence properties were also discussed. In addition, cyclic voltammograms were used to characterize electrochemical properties of the Zn(II)-Ln(III) (Ln = Sm, Eu, Gd and Tb) complexes. (C) 2018 Elsevier B.V. All rights reserved.