Details

Autor(en) / Beteiligte

• Jin, Yinghua
• Voss, Bret A
• Jin, Athena
• Long, Hai
• Noble, Richard D
• Zhang, Wei

Titel

Highly CO2-Selective Organic Molecular Cages: What Determines the CO2 Selectivity

Ist Teil von

• Journal of the American Chemical Society, 2011-05, Vol.133 (17), p.6650-6658

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A series of novel organic cage compounds 1−4 were successfully synthesized from readily available starting materials in one-pot in decent to excellent yields (46−90%) through a dynamic covalent chemistry approach (imine condensation reaction). Covalently cross-linked cage framework 14 was obtained through the cage-to-framework strategy via the Sonogashira coupling of cage 4 with the 1,4-diethynylbenzene linker molecule. Cage compounds 1−4 and framework 14 exhibited exceptional high ideal selectivity (36/1−138/1) in adsorption of CO2 over N2 under the standard temperature and pressure (STP, 20 °C, 1 bar). Gas adsorption studies indicate that the high selectivity is provided not only by the amino group density (mol/g), but also by the intrinsic pore size of the cage structure (distance between the top and bottom panels), which can be tuned by judiciously choosing building blocks of different size. The systematic studies on the structure−property relationship of this novel class of organic cages are reported herein for the first time; they provide critical knowledge on the rational design principle of these cage-based porous materials that have shown great potential in gas separation and carbon capture applications.