上海科技大学知识管理系统

We present a metal docking strategy utilizing the precise spatial arrangement of organic struts as metal chelating sites in a MOF. Pairs of uncoordinated N atoms on adjacent pyrazole dicarboxylate linkers distributed along the rod-shaped Al-O secondary building units in MOF-303 [Al(OH)(C5H2O4N2)] were used to chelate Cu-I and Ag-I with atomic precision and yield the metalated Cu- and Ag-MOF-303 compounds [(CuCl)(0.50)Al(OH)(C5H2O4N2) and (AgNO3)(0.49)Al(OH)(C5H2O4N2)]. The coordination geometries of Cu-I and Ag-I were examined using 3D electron diffraction and extended X-ray absorption fine structure spectroscopy techniques. The resulting metalated MOFs showed pore sizes matching the size of Xe, thus allowing for binding of Xe from Xe/Kr mixtures with high capacity and selectivity. In particular, Ag-MOF-303 exhibited Xe uptake of 59 cm(3) cm(-3) at 298 K and 0.2 bar with a selectivity of 10.4, placing it among the highest performing MOFs.