A dinuclear manganese(III) complex with 2-(5-nitro-2-hydroxyphenyl)-1,3-bis(2-(5-nitro-2-hydroxybenzylideneamino)ethyl)imidazolidine (H3LNO2) 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-LNO2)(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)Å 3 , Dcalcd = 1.621 g/cm 3 , 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 LNO2 3and a μ-oxido-oxygen atom, where each manganese(III) atom is further coordinated by phenolato-oxygen, imino-and imidazolidine-nitrogen atoms of LNO2 3in a meridional fashion and a bromido ligand to form a distorted octahedral geometry.

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