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A new metal docking method was developed using organic structures to precisely arrange metal chelating sites in a metal-organic framework (MOF).
The study focused on MOF-303, which utilized uncoordinated nitrogen atoms to bond with Cu and Ag, creating new metalated compounds.
The resulting Ag-MOF-303 showed excellent capability for capturing xenon from mixtures and ranked high in performance, with a significant uptake capacity and selectivity.
Article Abstract
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)(C H O N )] were used to chelate Cu and Ag with atomic precision and yield the metalated Cu- and Ag-MOF-303 compounds [(CuCl) Al(OH)(C H O N ) and (AgNO ) Al(OH)(C H O N )]. The coordination geometries of Cu and Ag 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 cm at 298 K and 0.2 bar with a selectivity of 10.4, placing it among the highest performing MOFs.
