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A novel Cobalt(II) coordination polymer formulated as [Co(hmph)(4-bpo)(H 2 O)] n  ( 1 ) was obtained through hydrothermal method, and then characterized by single-crystal X-ray diffraction, elemental analysis and powder X-ray diffraction (H 2 hmph = homophthalic acid, 4-bpo = 2,5-bis(4′-pyridyl)-1,3,4-oxadiazole). Complex  1  displays a three-dimensional architecture based on interweaving helix chains, which can be defined as a 4-connected  uoc  network with the Schläfli symbol of (4 2 .8 4 ). TGA experiment reveals that complex  1  can maintain its integrity until 214 °C. Furthermore, the magnetic data indicate there is weak antiferromagnetic interaction between the neighbor Co(II) atoms in the metal-carboxylate chain.

inorganic and nano-metal chemistry

A helix-based cobalt(II) coordination polymer with mixed ligands of homophthalic acid and 2,5-Bis(4′-pyridyl)-1,3,4-oxadiazole: synthesis, structure and magnetic property