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

The synthesis and characterization of copper(II), manganese(III), and iron(III) complexes [Cu 2 (L 1 )(OAc)Cs 2 -(MeOH) 2 ] n (1), [Mn 2 (H 3 L 1 ) 2 (OMe) 2 ]·2MeOH (2), [Fe 2 (H 3 L 1 ) 2 -(Hpz) 4 ](ClO 4 ) 2 ·2CH 3 CN (3), and [Fe 2 (H 3 L 3 ) 2 (OMe) 2 ]· 8MeOH (4) of potentially pentaanionic heptadentate ligands, 2-hydroxy-N-{2-hydroxy-3-[(2-hydroxybenzoyl)amino]propyl)benzamide (H 5 L 1 ) and 2-hydroxy-N-{3-hydroxy-5-[(2-hydroxybenzoyl)amino]pentyl}benzamide (H 5 L 3 ), are reported. The crystal structure and magnetic properties of these complexes have been determined. In complex 1, the ligand H 5 L 1 acts as a heptadentate, fully deprotonated ligand, [L 1 ] 5- . In complexes 2, 3, and 4, H 5 L 1 (2, 3) and H 5 L 3 (4) act as tetradentate, partially deprotonated ligands, [H 3 L 1 ] 2- and [H 3 L 3 ] 2- . In complex 1, anionic [Cu 2 (L 1 )(OAc)] 2- and cationic [Cs(MeOH)] + units are linked through a quadruply bridging acetate ion and through the phenoxido-oxygen and amido-oxygen donor atoms of [L 1 ] 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.