Metal-organic frameworks are a sort of rapid development crystal solids,which have greatly attracted a large amount of attention in recent decades.The construction of 3D[Ni(bcp)(bpp)]n (namely complex 1) displays a rare[3+3+3]nine-fold interpenetrated diamond topology,which can be successfully synthesized by a mixed strategy of 1,3-bis(4-carboxyphenoxy) propane (H2bcp) and 1,4-bis(4-pyridylmethyl) piperazine (bpp).The interpenetrated network may be ascribed to these flexible bridging linkers to facilitate the penetration degree.In addition,the resultant sample was adequately characterized by elemental analysis,single-crystal X-ray diffraction,powder X-ray diffraction,and thermal gravimetric analysis.Furthermore,the as-synthesized sample can be used as catalysis for chemical fixation of CO2 and epoxide to carbonate.