Syntheses, Structures, and Characterization of Two Manganese( II )‐Aminobenzoic Complexes

A discrete tetranuclear manganese( II ) complex, {(H 3 O) 2 Mn 4 (4‐Haba) 2 (4‐aba) 6 (SCN) 4 (H 2 O) 2 ]} ( 1 ) and a two‐dimensional coordination polymer [Mn(3‐aba) 2 ] n ( 2 ) (4‐Haba = 4‐aminobenzoic acid, 3‐Haba = 3‐aminobenzoic acid), have been synthesized and characterized by elemental analyses, IR, X‐ray crystallography, and magnetic susceptibility. In complex 1 , 4‐aba in three types of coordination modes connects Mn II centers to form a discrete tetranuclear anionic molecule. Hydrogen bonding interaction links the tetranuclear units to generate a one‐dimensional supramolecular chain. In complex 2 , 3‐aba in an exo ‐tridentate mode bridges six‐coordinate Mn II centers forming a two‐dimensional coordination architecture. Studies of the magnetic susceptibilities of 1 and 2 reveal weak antiferromagnetic exchange interactions between adjacent Mn II centers. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)