BN-Doped Metal–Organic Frameworks: Tailoring 2D and 3D Porous Architectures through Molecular Editing of Borazines

Francesco Fasano, Jacopo Dosso, C. Grazia Bezzu, Mariolino Carta, François Kerff, Nicola Demitri, Bao Lian Su, Davide Bonifazi

Research output: Contribution to journalArticlepeer-review

Abstract

Building on the MOF approach to prepare porous materials, herein we report the engineering of porous BN-doped materials using tricarboxylic hexaarylborazine ligands, which are laterally decorated with functional groups at the full-carbon ‘inner shell’. Whilst an open porous 3D entangled structure could be obtained from the double interpenetration of two identical metal frameworks derived from the methyl substituted borazine, the chlorine-functionalised linker undergoes formation of a porous layered 2D honeycomb structure, as shown by single-crystal X-ray diffraction analysis. In this architecture, the borazine cores are rotated by 60° in alternating layers, thus generating large rhombohedral channels running perpendicular to the planes of the networks. An analogous unsubstituted full-carbon metal framework was synthesised for comparison. The resulting MOF revealed a crystalline 3D entangled porous structure, composed by three mutually interpenetrating networks, hence denser than those obtained from the borazine linkers. Their microporosity and CO2 uptake were investigated, with the porous 3D BN-MOF entangled structure exhibiting a large apparent BET specific surface area (1091 m2 g−1) and significant CO2 reversible adsorption (3.31 mmol g−1) at 1 bar and 273 K.

Original languageEnglish
Pages (from-to)4124-4133
Number of pages10
JournalChemistry - A European Journal
Volume27
Issue number12
Early online date30 Nov 2020
DOIs
Publication statusPublished - 24 Feb 2021

Keywords

  • BN-doping
  • borazine
  • gas adsorption
  • heteroatom doping
  • meta–organic frameworks

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