Development of a Novel Class of Organic Cage Framework (OCF) Materials Wei Zhang, University of Colorado at Boulder, DMR 1055705.
Zhang group successfully synthesized a series of novel organic cage compounds 1-4 with high efficiency from readily available starting materials via imine condensation. A covalently crosslinked cage framework was also 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 the OCF exhibited exceptional high ideal selectivity (36/1-138/1) in adsorption of CO2 over N2 under ambient conditions. 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, which can be tuned by judiciously choosing building blocks of different size.
Unprecedented high ideal selectivity in
adsorption of CO2 over N2 (up to 138/1)
J. Am. Chem. Soc. 2011, 133, 6650.