Encapsulation of a Porous Organic Cage into the Pores of a Metal–Organic Framework for Enhanced CO2 Separation. (3rd February 2020)

• Record Type: Journal Article
• Authors: Liang, Jun; Nuhnen, Alexander; Millan, Simon; Breitzke, Hergen; Gvilava, Vasily; Buntkowsky, Gerd; Janiak, Christoph
• Is Part Of: Angewandte Chemie. Volume 132:Number 15(2020)
• Page Start: 6124
• Page End: 6129
• Publication Date: 2020-02-03
• Subjects: Cucurbituril -- Hybridmaterialien -- Kohlendioxid -- Metall-organische Gerüste -- Poröse organische Käfige; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201916002
• Languages: English
• ISSNs: 0044-8249

Abstract

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 CO2 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 CO2 are created in the resulting CB6@MIL‐101 composites, leading to enhanced CO2 uptake capacity and CO2 /N2, CO2 /CH4 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. Abstract : Auf einem „Gast‐in‐Gast"‐System basieren Hybridmaterialien, die durch die Verkapselung von Cucurbit[6]uril(CB6)‐Käfigen in MOF‐Nanoporen erhalten wurden. Die CB6@MIL‐101‐Komposite sind effiziente poröse Adsorptionsmittel mit verbesserter CO2 ‐Aufnahmekapazität und guter CO2 /N2 ‐ bzw. CO2 /CH4 ‐Trennung bei niedrigem Druck.