μ-Phenolato-μ-benzoato-bridged Dinuclear Copper(II) Cluster with a Ferromagnetic Coupling

Abstract

A μ-phenolato-μ-benzoato-bridged dinuclear copper(II) complex with 2-(5-chloro-2-hydroxyphenyl)-1,3-bis(2-(5-chloro-2-hydroxybenzylideneamino)ethyl)imidazolidine (H₃L_Cl) was synthesized. The crystal structure was determined by the single-crystal X-ray diffraction method at 90 K. The complex crystallizes as [Cu₂(L_Cl)(μ-C₆H₅CO₂)]·H₂O in the monoclinic space group C2/c with a = 26.016(7), b = 15.634(4), c = 18.360(5)Å, β = 109.073(3)°, V = 7057(3)ų, D_x = 1.553 g/cm³, Z = 8. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0543 and 0.1396, respectively, for all 8488 independent reflections. The two copper(II) atoms are bridged by the phenolato-oxygen of L_Cl³⁻ and a monatomic-bridging benzoato ligand, where each copper(II) atom is further coordinated by a phenolato-oxygen, imino- and imidazolidine-nitrogen atoms of L_Cl³⁻ in a meridional fashion to form a square-pyramidal geometry. The temperature dependence of the magnetic susceptibilities showed a ferromagnetic interaction with J = +22.8 cm⁻¹ between the two copper(II) atoms.