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 . (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)