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Construction of two microporous metal-organic frameworks with flu and pyr topologies based on Zn4(μ3-OH)2(CO2)6 and Zn6(μ6-O)(CO2)6 secondary building units.
Inorganic Chemistry 2014 January 22
By employment of a tripodal phosphoric carboxylate ligand, tris(4-carboxylphenyl)phosphine oxide (H3TPO), two novel porous metal-organic frameworks, namely, [Zn4(μ3-OH)2(TPO)2(H2O)2] (1) and [Zn6(μ6-O)(TPO)2](NO3)4·3H2O (2), have been synthesized by solvothermal methods. Complexes 1 and 2 exhibit three-dimensional microporous frameworks with flu and pyr topologies and possess rare butterfly-shaped Zn4(μ3-OH)2(CO2)6 and octahedral Zn6(μ6-O)(CO2)6 secondary building units, respectively. Large cavities and one-dimensional channels are observed in these two frameworks. Gas-sorption measurements indicate that complex 2 has a good H2 uptake capacity of 171.9 cm(3) g(-1) (1.53 wt %) at 77 K and 1.08 bar, and its ideal adsorbed solution theory calculation predicts highly selective adsorption of CO2 over N2 and CH4. Furthermore, complexes 1 and 2 exhibit excellent blue emission at room temperature.
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