Design Of Co^â…¡-based Metal-Organic Framework And Its Catalytic Performance Study

Olefins epoxidation is one of the important reactions in organic synthesis. On account oftheir active oxido existence, expoxy compounds can react with various organic mattersgetting lots of high additional evaluation substances. Molecular oxygen (O2) as oxidantoccupies vital academic significance and broad application prospect in alkene epoxidation.Metal-organic frameworks (MOFs) are a new kind of crystalline porous materials beingformed from organic ligands and metal ions. MOFs have engaged intense interests because oftheir potential applications in catalysis, magnetism, separation, gas adsorption and chemicalsensor. Here we adopt Co(NO3)2·6H2O as metal active site to constract two kinds ofCoIIMOF-catalyst in olefin epoxidation.Compound (1){(NH4)2[Co3(Ina)(BDC)3(HCOO)]} is a microporous metal organicframework. Each paddle-wheel secondary building units are consist of three cobalt ions, fourterephthalic acid, two isonicotinic acid. Using O2as oxidant,(1) is investigated as a goodperformed heterogeneous catalytic material for cyclooctene epoxidation, conversion ofcyclooctene is98%and selectivity of epoxycyclooctane is92%, TOF is1370h-1.Compound (2)[PCN-100(Co)] has successfully been synthesized by hydrothermalmethod. Each SBUs are consist of four zinc ions and eight TATAB ligands. PCN-100(Co) isembellished via one-step post-functionalization and investigated as a good performedheterogeneous catalytic material for various olefins epoxidation. Especially for cyclooctene,conversion of cyclooctene is92%and selectivity for epoxycyclooctane is91%, TOF is509h-1.