One Novel 3D Supramolecular Network Based on Dicobalt-Carboxylate Secondary Building Units with Polycarboxylate Ligands 1, 2, 3, 4-Butanetetracarboxylic Acid

A novel cobalt-carboxylate framework constructed from secondary building units (SBUs), {[Co-16(btca)(8)(H2O)(40)]center dot 16H(2)O}(n) (1) (H(4)btca = 1,2,3,4-butanetetracarboxylic acid) has been hydrothermally synthesized and characterized by techniques of single-crystal X-ray diffraction analyses, elemental analyses, infrared spectra, powder X-ray diffraction and thermogravimetric analyses. The complex exhibits 2D 4-connected sql net with (4(4) x 6(2)) topology symbol built from [Co-2(COO)(4)(H2O)(5)] SBUs and is further extended into a 3D supramolecular architecture via strong O-H center dot center dot center dot O hydrogen bonds. Moreover, the magnetic measurements indicate complex 1 exhibit antiferromagnetic behavior.