Structural variability of Co(ii) and Ni(ii) entangled metal–organic frameworks: effect of N-donor ligands and metal ionsElectronic supplementary information (ESI) available: Description of crystallography, supplementary figures, including TGA, powder XRD profiles, tables of bond parameters, chart and CIF files for MOF reported in this paper. CCDC reference numbers 780705–780707. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c0ce00871k

Through tuning the conformations of N-donor ligands and the coordinative preferences of metal ions, three new metal–organic frameworks with different dimensionalities, namely, {[Co(L1)(bpp)(H2O)]·0.63H2O}n(1), [Ni(L1)(bpp)(H2O)(CH3OH)]n(2) and {Co2(L1)2(bpe)2(H2O)2}·(H2O)(CH3CN)}n(3) (H2L1 = 1,2-bis(4-carboxy-phenoxy)ethane, bpp = 1,3–bis(4-pyridyl)propane and bpe = 1,2–bis(4-pyridyl)ethene), have been synthesized and structurally characterized. Compound 1exhibits a 2D → 2D parallel interpenetrating motif containing two kinds of double helixes. Polymer 2displays 2D → 3D interpenetrating framework. Compound 3is composed of 3D unusual self-interpenetrating net with (4,6)-connected (54·68)(56·65·72·82) topology. This work evidently indicates that the effect of secondary ligands and geometric preferences of metal centers are critical in construction of polymeric arrangement. In addition, the stabilities of these compounds and the magnetic behaviour of 3are discussed. [ABSTRACT FROM AUTHOR]