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A novel nickel(Ⅱ)complex[Ni(H2tpda)(NCS)2(CH3OH)]was synthesized by using tripyridyl-diamine as ligand and Ni(NCS)2 as starting materials,and characterized by a variety of techniques including single-crystal X-ray diffraction,IR spectroscopy and TG-DSC.The single-crystal structure reveals that the complex exhibits as a neutral molecule and that the central atom Ni(Ⅱ)is octahedrally coordinated by an H2tpda,two NCS-ions and a ligand molecule CH3OH.The 3D supramolecular network is formed through hydrogen bonds and π-π interactions.The complex can catalyze the addition reaction of carbon dioxide and propylene oxide.