Transformation of a copper-based metal-organic polyhedron into a mixed linker MOF for CO 2 capture.

A new mixed linker metal-organic framework (MOF) has been synthesized from a copper-based metal-organic polyhedron (MOP-1) and 2,2'-bipyridine (2,2'-bipy). The CuMOF-Bipy with a formula of [Cu(2,2'-bpy)(-BDC)] is comprised of a binuclear Cu(II) node coordinated to 2,2'-bipy, and isophthalic acid (-BDC), which bridges to neighboring nodes. The crystal structure of CuMOF-Bipy consists of a stacked two-dimensional framework with the topology. CuMOF-Bipy was characterized by single-crystal X-ray diffraction (SC-XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and CO sorption. CuMOF-Bipy was shown to have one-dimensional sinusoidal channels that allow diffusion of CO but not N.