Synthesis and Characterization of a Ladder‐Like Coordination Polymer Composed of Trimanganese Clusters Formed and Linked by Isophthalato Ligands

A new isophthalatomanganese(II) coordination polymer, [Mn3(ip)2(Hip)2(bipy)2]n·2.5nH2O [H2ip = isophthalic acid, bipy = 2,2′‐bipyridine], has been obtained directly by heating to reflux a weakly acidic solution containing bipy, Mn(OAc)2·4H2O, and H2ip. The polymer was characterized by single‐crystal X‐ray diffraction and magnetic measurements. The complex contains rare isophthalato‐bridged trimanganese cluster building units further linked by isophthalato ligands in a newly observed binding mode, forming a one‐dimensional, ladder‐like chain network. The magnetic interactions within the complex were quantitatively evaluated by using a combination of a trimeric model and a mean molecular field approximation model. The complex was shown to be antiferromagnetic like other discrete trimanganese clusters with a structurally similar core.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)