The accurate design and systematic engineering of MOFs
is a large
challenge due to the randomness of the synthesis process. Isoreticular
chemistry provides a powerful approach for the regulation of pore
environment in a more predictable and precise way to systematically
control gas/vapor adsorption performances. Herein, utilizing an effective
strategy of altering the “pillared” motifs of pillared
layer structures, three isoreticular ultramicroporous MOFs were successfully
constructed. Combined with the reported parent MOFs and two other
recorded isoreticular MOFs modified with −NH2 and
−CH3, gas and vapor uptake performances of this
family of isoreticular pillared layer MOFs were systematically explored.
The achievement of direct C 2 H 4 separation from C 2 hydrocarbons is very challenging in the petrochemical industry due to their similar molecular sizes, boiling points, and physicochemical properties. In this work, a nonpolar/inert ultramicroporous metal− organic framework (MOF), [Co 3 (μ 3 -OH)(tipa)(bpy 1), with stand-alone one-dimensional square tubular channels was successfully constructed, its pore enriched with plenty of aromatic rings causing nonpolar/inert pore surfaces. The MOF shows preferential adsorption of C 2 H 6 compared to C 2 H 4 and C 2 H 2 in the low-pressure region, which is further verified by adsorption heats and selectivities. The C 2 H 4 separation potential in one step for binary C 2 H 6 /C 2 H 4 (50/50 and 10/90) and ternary C 2 H 4 /C 2 H 6 / C 2 H 2 (89/10/1) is also examined by transient breakthrough simulations. Moreover, grand canonical Monte Carlo simulations demonstrate that the unique reversed adsorption mechanism is due to the shortest and most number of C−H•••π interactions between C 2 H 6 and the framework.
The cage-based MOFs have been attracted widely interest due to their large internal ordered cavities and small windows, which can selectively capture and separate the guest molecules. Herein, a unique...
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