Synthesis, structure and magnetic properties of a cobalt(II) mesoxalate 1D coordination polymer

Abstract Mesoxalate ligand (H 2 mesox) 2− , the conjugate base of the mesoxalic acid (2,2’‐dihydroxyl‐malonic acid) reacts with cobalt (II) ions to form the 1‐D coordination polymer {[Co(H 2 mesox)(H 2 O) 2 ] ⋅ H 2 O} n . This compound displays a structure based on homochiral polymeric chains which stack together in an AABB fashion through hydrogen bonding by both coordination and crystallisation water molecules. Although the magnetic properties for such a Co(II) compound are difficult to interpret in the whole temperature range, at low temperatures the Co(II) behaves as an S =1/2 effective spin and equation derived by Fisher from the Ising model was applied to analyse the data in the 4–40 K range. The magnetic interactions in this compound are compared with the magnetic interactions displayed by similar compounds reported in the literature.