Two-dimensional supramolecular architecture of oxamido-bridged binuclear Copper(II) complex Cu-2(oxen)(NCS)(2)(DMF)(2)

摘要

An oxamido-bridged binuclear copper(II) complex, Cu-2(oxen)(NCS)(2)(DMF)(2) (1) (H(2)oxen = N,N'-bis(2-aminoethyl)oxamide, DMF = dimethylformamide), has been synthesized by the reaction of Cu(oxen) center dot 2H(2)O with CuCl2 center dot 2H(2)O and KSCN in DMF/CH3OH solution, and characterized by elementary analysis, FT-IR spectra and X-ray single-crystal diffraction. Structural analysis reveals that complex 1 forms a centrosymmetric binuclear molecule in which an oxamido group in the trans conformation bridges two crystallographically equivalent five-coordinate copper(II) ions with Cu-Cu distance of 5.279(2) angstrom. The complex molecules are assembled into a novel 2D layer through weak Cu center dot center dot center dot S interactions (d (Cu-S) = 3.341(4) angstrom) and intermolecular hydrogen bonds. Viewed along the crystallographic b axis, layers display an interesting hydrophobic-hydrophilic-hydrophobic sandwich arrangement, with the hydrophobic layers dominated by dipole interaction of DMF molecules.