Structure and Properties of Copper(II),Manganese(III), and Iron(III)Complexes with Potentially Pentaanionic Heptadentate Ligands Including Alkoxido, Amido, and Phenoxido Donors

摘要

The synthesis and characterization of copper(II), manganese(III), and iron(III) complexes [Cu2(L1)(OAc)Cs2- (MeOH)2]n (1), [Mn2(H3L1)2(OMe)2]·2MeOH (2), [Fe2(H3L1)2- (Hpz)4](ClO4)2·2CH3CN (3), and [Fe2(H3L3)2(OMe)2]· 8MeOH (4) of potentially pentaanionic heptadentate ligands, 2-hydroxy-N-{2-hydroxy-3-[(2-hydroxybenzoyl)amino]propyl} benzamide (H5L1) and 2-hydroxy-N-{3-hydroxy-5-[(2-hydroxybenzoyl) amino]pentyl}benzamide (H5L3), are reported. The crystal structure and magnetic properties of these complexes have been determined. In complex 1, the ligand H5L1 acts as a heptadentate, fully deprotonated ligand, [L1]5–. In complexes 2, 3, and 4, H5L1 (2, 3) and H5L3 (4) act as tetra-dentate, partially deprotonated ligands, [H3L1]2– and [H3L3]2–. In complex 1, anionic [Cu2(L1)(OAc)]2– and cationic [Cs(MeOH)]+ units are linked through a quadruply bridging acetate ion and through the phenoxido-oxygen and amidooxygen donor atoms of [L1]5– to yield a 2D polymeric network. Complexes 2–4 form extended supramolecular networks. Magnetic susceptibility data evidence antiferromagnetic interactions for 1, 2, and 4. The Fe···Fe distance is too long to allow measurable magnetic interactions in complex 3.