Tetracarboxylate-based Co(ii), Ni(ii) and Cu(ii) three-dimensional coordination polymers: syntheses, structures and magnetic propertiesElectronic supplementary information (ESI) available: Experimental details. CCDC reference numbers 763322–763324. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c001655a

Methylenediisophthalic acid (H4MDIP), as semi-rigid ‘V’-shaped carboxylate ligands, react with CoO, NiO and Cu(NO3)2·3H2O to give three novel coordination polymers [H3O]2[Co3(MDIP)2]·2DMF (1), [Ni2(HMDIP)(μ2-OH)(H2O)3(DMF)]·4H2O·DMF (2) and [Cu3(MDIP)(μ2-OH)2(H2O)4]·6.5H2O (3) (DMF = N,N′-dimethylformamide). All compounds have been characterized by thermogravimetric analysis, IR spectroscopy, elemental and single-crystal X-ray diffraction analyses. Complex 1is an unusual open anionic framework that is defined as the metal–organic replica of fluorite. Both 2and 3features a 3D open framework with one-dimensional elliptical channels and R- and L-helical chains, and their resulting frameworks can be rationalized as crband ptstopology respectively. An interesting feature of complex 3is the presence of the linear Cu3units that is formed by carboxylate and μ2-hydroxyl groups linking three Cu(ii) metal centers. Magnetic investigations indicate that ferromagnetic couplings are dominant in the three compounds. [ABSTRACT FROM AUTHOR]