Synthesis and Crystal Structure of a Novel Supramolecular Nanotube Copper(II) Complex with 3,3′‐Dihydroxy‐2,2′‐[Ethylenedioxybis(nitrilomethylidyne)]diphenol

This work was supported by the Natural Science Foundation of Gansu and the ‘Qing Lan’ Talent Engineering Funds of Lanzhou Jiaotong University.

A novel tetradentate oxime chelating ligand, 3,3′‐Dihydroxy‐2,2′‐[Ethylenedioxybis(nitrilomethyli‐dyne)]diphenol (H₄L), and its mononuclear copper(II) complex [Cu(H₂L)] · 2H₂O have been synthesized and characterized by elemental analysis, IR, UV‐vis and ¹H‐NMR etc. The X‐ray crystallography of complex [Cu(H₂L)] · 2H₂O indicates that the asymmetric unit consists of discrete [Cu(H₂L)] and two crystallizing waters. The four atoms of the donor set (N1, N2, O1, O2) in the N₂O₂ coordination sphere and Cu1 approximately lie in a plane. The dihedral angle between the coordination plane of N(1)‐Cu(1)‐O(1) and that of N(2)‐Cu(1)‐O(2) is 16.6(8)°, indicating that the coordination environment is only slight distortion toward tetrahedral geometry from the square planar structure. The approximately hexagonal nanotube (10.412×4.989 Å) formed by the intermolecular hydrogen bonds in the central of the dimer were observed along the crystallographic b axis.

Keywords:

• copper complex
• 3,3′‐dihydroxy‐2,2′‐[ethylenedioxybis (nitrilomethylidyne)]diphenol
• hydrogen bond
• nanotube, crystal structure

Notes

This work was supported by the Natural Science Foundation of Gansu and the ‘Qing Lan’ Talent Engineering Funds of Lanzhou Jiaotong University.