A Binuclear Iron(Iii) Schiff Base Complex Doubly Bridged by Hydroxyl Groups: Synthesis, Structure, and Characterization

A novel binuclear iron(III) Schiff base complex [Fe2(NO2-Salpn)2(μ-OH)2] · H2O (I) (NO2-Salpn = 5-nitrosalicylaldehyde-1,3-propanediamine) has been obtained through one-pot refluxing and condensation. Complex I was established by single-crystal X-ray diffraction analysis (CIF file CCDC no. 1005239) and further characterized by elemental analysis, IR spectroscopy, electrochemical and magnetochemical measurements. Complex I consists of two pseudooctahedral high-spin iron(III) units doubly bridged by two hydroxyl groups. The inter hydrogen bonding interactions connect the adjacent binuclear units into one dimensional (1D) infinite chain, and these 1D chains are further propagated into the two dimensional (2D) supramolecular network by weak intermolecular interactions. Variable temperature magnetic measurements indicate the presence of strong antiferromagnetic interactions between the two adjacent iron(III) ions.