Synthesis of novel PCP-pincer functionalized metal organic framework for selective CO₂ chemisorption
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Herein, we report the synthesis of a novel tetra(carboxylated) PCP-pincer ligand as building block of Metal Organic Frameworks (MOFs). The pincer ligand is potentially appropriate for cyclometallating various of soft metals, such as Pd, and the resulting cyclometallated pincer ligand is geometrically rigid for synthesis of MOFs. A porous 3D MOF is formed by reacting the cyclometalloligand and Co(II) ions via solvothermal synthesis method and studied by single crystal X-ray diffraction. The adsorption-desorption isotherm of the crystalline materials indicates CO₂ gas is preferentially able to access the pores over other gases like N₂ and CO. Furthermore, after the Pd-Cl groups inside the pores are modified to be Pd-Me, CO₂ gas can be inserted rapidly at 1 atm and room temperature. More interestingly, taking the advantage of adsorption property, CO insertion is unflavored in Pd-N₃ modified version. Detailed explorations are done via FTIR and solid state MSA-NMR.