A three-fold interpenetrating three-dimensional Co(II) coordination polymer, [Co(BTB)3(BF4)2]n (1) [BTB = 1,4-bis(1,2,4-triazol-1-yl)-butane] has been prepared and characterized through IR, elemental analysis, thermal analysis and single-crystal X-ray diffraction. Singlecrystal X-ray diffraction analysis revealed that complex 1 is 3-fold interpenetrating α-polonium cubic network. In addition, complex 1 exhibits very weak antiferromagnetic coupling between Co(II) ions in low temperature.

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Three rare earth metal supramolecular complexes, {[Tb(L 2 ) 4 ](ClO 4have been synthesized and characterized by elemental analysis, IR and single crystal X-ray diffraction. The crystal structure analysis reveals that the coordination numbers of three complexes (1-3) are 8, 9 and 10, respectively. Three complexes assembled into 3D frameworks based on C-H· · · O, O-H· · · O hydrogen bond linkages.