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 (2,2'-bpy) 2 ( m -BDC) 2 ] n is comprised of a binuclear Cu(II) node coordinated to 2,2'-bipy, and isophthalic acid ( m -BDC), which bridges to neighboring nodes. The crystal structure of CuMOF-Bipy consists of a stacked two-dimensional framework with the sql topology. CuMOF-Bipy was characterized by single-crystal X-ray diffraction (SC-XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and CO 2 sorption. CuMOF-Bipy was shown to have one-dimensional sinusoidal channels that allow diffusion of CO 2 but not N 2 .