| Summary: | Two Co(II)-based metal–organic frameworks (MOFs) with open channels, [(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]<sub>2</sub>[Co<sub>5</sub>L(H<sub>2</sub>O)<sub>8</sub>]·4H<sub>2</sub>O (<b>1</b>) and [Co<sub>6</sub>L(DMF)<sub>2</sub>(H<sub>2</sub>O)<sub>8</sub>]·2H<sub>2</sub>O (<b>2</b>), were synthesized using resorcin[4]arene ligand (H<sub>12</sub>L). Compounds <b>1</b> and <b>2</b> exhibit different 3D microporous framework structures: <b>1</b> possesses two kinds of open channels parallel to the a-axis (ca. 5.0 × 5.0 Å) and the b-axis (ca. 4.0 × 6.0 Å), and <b>2</b> is an open framework with a window size of 5.6 × 5.6 Å. The activated crystal <b>1</b> involves many Lewis acid sites; thus, <b>1</b> shows prominent activity and recyclability for the reaction of carbon dioxide coupled with epoxides. Most strikingly, catalyst <b>1</b> can be reused for five successive cycles and provides outstanding catalytic activity.
|
|---|