Crystal Structure of μ-Oxido-μ-phenolato-bridged Dinuclear Manganese(III) Complex of Schiff-base Ligand with Bromido Coordination

Abstract

A dinuclear manganese(III) complex with 2-(5-nitro-2-hydroxyphenyl)-1,3-bis(2-(5-nitro-2-hydroxybenzylideneamino)ethyl)imidazolidine (H₃L_NO2) was synthesized. The crystal structure was determined by the single-crystal X-ray diffraction method at 90 K. The complex crystallized as [(C₂H₅)₃NH][Mn₂(μ-L_NO2)(μ-O)Br₂]·2THF in the orthorhombic space group Pnma with a = 14.890(2), b = 20.903(3), c = 14.7765(19)Å, V = 4599.3(11)ų, D_calcd = 1.621 g/cm³, Z = 4. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0539 and 0.1260, respectively, for all 5416 independent reflections. The two manganese(III) atoms are bridged by a phenolato-oxygen atom of L_NO2³⁻ and a μ-oxido-oxygen atom, where each manganese(III) atom is further coordinated by phenolato-oxygen, imino- and imidazolidine-nitrogen atoms of L_NO2³⁻ in a meridional fashion and a bromido ligand to form a distorted octahedral geometry.