Encapsulation of a Porous Organic Cage into the Pores of a Metal-Organic Framework for Enhanced CO 2 Separation.

Authors :: Liang J
Nuhnen A
Millan S
Breitzke H
Gvilava V
Buntkowsky G
Janiak C
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2020 Apr 06; Vol. 59 (15), pp. 6068-6073. Date of Electronic Publication: 2020 Feb 03.
Publication Year :: 2020
Abstract: We present a facile approach to encapsulate functional porous organic cages (POCs) into a robust MOF by an incipient-wetness impregnation method. Porous cucurbit[6]uril (CB6) cages with high CO <subscript>2</subscript> affinity were successfully encapsulated into the nanospace of Cr-based MIL-101 while retaining the crystal framework, morphology, and high stability of MIL-101. The encapsulated CB6 amount is controllable. Importantly, as the CB6 molecule with intrinsic micropores is smaller than the inner mesopores of MIL-101, more affinity sites for CO <subscript>2</subscript> are created in the resulting CB6@MIL-101 composites, leading to enhanced CO <subscript>2</subscript> uptake capacity and CO <subscript>2</subscript> /N <subscript>2</subscript> , CO <subscript>2</subscript> /CH <subscript>4</subscript> separation performance at low pressures. This POC@MOF encapsulation strategy provides a facile route to introduce functional POCs into stable MOFs for various potential applications.<br /> (© 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.)

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