Triple Framework Interpenetration and Immobilization of Open Metal Sites within a Microporous Mixed Metal–Organic Framework for Highly Selective Gas Adsorption
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Abstract
A three-dimensional triply interpenetrated mixed metal-organic framework, Zn(2)(BBA)(2)(CuPyen)·G(x) (M'MOF-20; BBA = biphenyl-4,4'-dicarboxylate; G = guest solvent molecules), of primitive cubic net was obtained through the solvothermal reaction of Zn(NO(3))(2), biphenyl-4,4'-dicarboxylic acid, and the salen precursor Cu(PyenH(2))(NO(3))(2) by a metallo-ligand approach. The triple framework interpenetration has stabilized the framework in which the activated M'MOF-20a displays type-I N(2) gas sorption behavior with a Langmuir surface area of 62 m(2) g(-1). The narrow pores of about 3.9 Å and the open metal sites on the pore surfaces within M'MOF-20a collaboratively induce its highly selective C(2)H(2)/CH(4) and CO(2)/CH(4) gas separation at ambient temperature.
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