An asymmetric salen-type bisoxime ligand and its supramolecular copper(II) complex: Synthesis, crystal structure and spectral properties

摘要

A supramolecular Cu(II) complex [CuL(H _2O)] with an asymmetric salen-type bisoxime ligand (H _2L = 4-nitro-6'-methoxy-2,2'- [ethylenediyldioxybis(nitrilomethylidyne)]diphenol) has been synthesized and characterized by elemental analysis, IR and UV/Vis spectroscopy, TG-DTA analysis, and molar conductance measurements. The crystal structure of the Cu(II) complex has been determined by single-crystal X-ray diffraction. The Cu(II) atom is penta-coodinated by N _2O _2 donor atoms from the asymmetic salen-type bisoxime L ~(2-) unit and one oxygen atom from the coordinated water molecule, resulting in an almost regular square-pyramidal geometry. With the help of intermolecular O-H· · · O, C-H···O hydrogen bonding and π ··· π stacking interactions, a self-assembled 3D supramolecular structure is formed.