Tetranuclear Nickel(II) Complex with an Unsymmetrical Pentadentate Schiff-base Ligand Having a Defective Double-Cubane Core

摘要

>A tetranuclear nickel(II) complex with 1-acetylacetoneimine-3-salicylideneamino-2-propanol (H₃asp), [Ni₄(asp)₂(CH₃O)₂(CH₃OH)₂], was synthesized, and the crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. The complex crystallizes in the monoclinic space group P2₁/c with a = 12.154(3)?, b = 11.821(3)?, c = 15.945(4)?, β = 112.214(3)°, V = 2120.9(9)?3, D_x = 1.421 g/cm3, and Z = 2. The R1 [I 2σ(I)] and wR2 (all data) values are 0.0363 and 0.1022, respectively, for all 5069 independent reflections. The complex has a centrosymmetric di-μ₃-methoxido-di-μ-alkoxido-di-μ-phenoxido-bridged tetranuclear nickel(II) structure with a defective double-cubane core, having two octahedral Ni and two five-coordinate Ni atoms with two unsymmetrical Schiff-base ligands and two methanol molecules. The temperature dependence of the magnetic susceptibility showed a ferromagnetic interaction between the nickel(II) ions. The spectral and magnetic properties are consistent with the crystal structure.