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Issue 18, 2013
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Microporous organic networks bearing metal-salen species for mild CO2 fixation to cyclic carbonates

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Abstract

This work shows that porous solid systems for catalytic carbon dioxide fixation can be developed by a direct assembly of metal-salen containing building blocks with organic connectors through a carbon–carbon bond formation reaction. For use as a dihalo building block, Al, Cr, Co-salen building blocks with two iodo groups were prepared. Sonogashira coupling of these building blocks with tetra(4-ethynylphenyl)methane resulted in microporous organic networks (MONs) bearing Al, Cr, and Co-salen species (Al-MON, Cr-MON, Co-MON). Scanning electron microscopy (SEM) showed that the materials had granular or spherical shapes. Brunauer–Emmett–Teller (BET) analysis revealed surface areas of up to 522–650 m2 g−1, and microporosity (<2 nm). The thermal stability of the materials was dependent on the degree of networking. Their chemical components were characterized by solid-phase 13C-nuclear magnetic resonance spectroscopy (NMR) and X-ray photoelectron spectroscopy (XPS). The materials containing metal-salen (M-MON) showed excellent chemical conversion of carbon dioxide with epoxide to cyclic carbonates under mild conditions (60 °C and 1 MPa CO2). Among the M-MONs, the Co-MON showed the best reactivity for carbon dioxide conversion to cyclic carbonates with 1400–1860 TON and 117–155 h−1 TOF. The size effect of epoxides in CO2 fixation was observed due to the microporosity of Co-MON.

Graphical abstract: Microporous organic networks bearing metal-salen species for mild CO2 fixation to cyclic carbonates

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Publication details

The article was received on 31 Jan 2013, accepted on 05 Mar 2013 and first published on 05 Mar 2013


Article type: Paper
DOI: 10.1039/C3TA10477J
Citation: J. Mater. Chem. A, 2013,1, 5517-5523
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    Microporous organic networks bearing metal-salen species for mild CO2 fixation to cyclic carbonates

    J. Chun, S. Kang, N. Kang, S. M. Lee, H. J. Kim and S. U. Son, J. Mater. Chem. A, 2013, 1, 5517
    DOI: 10.1039/C3TA10477J

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