Two Porous Co(Ii) Bithiophenedicarboxylate Metal-Organic Frameworks: From A Self-Interpenetrating Framework To A Two-Fold Interpenetrating Alpha-Po Topological Network

Two new porous metal-organic frameworks with the formulas [Co(btdc)(bpp)(H2O)(0.5)]center dot 8H(2)O (1) and Co-2(btdc)(2)(bpe)(2)center dot 19H(2)O (2) (H(2)btdc = 2,2'-bithiophene-5,5'-dicarboxylic acid, bpp = 1,3-di(4-pyridyl) propane, bpe = 1,2-bis(4-pyridinyl)ethane) have been synthesized under solvothermal conditions and characterized by single crystal X-ray diffraction analysis and powder X-ray diffraction, elemental analysis, IR, and thermogravimetric analysis (TGA). 1 features a three-dimensional (3D) self-interpenetrating framework which results from three-fold interpenetrating diamond network linked by the bpp ligands. 2 exhibits a three-dimensional two-fold interpenetrating pillar-layered framework with alpha-Po topology. The magnetic study of 1 shows that there exist antiferromagnetic interactions between the Co(II) centres.