London Dispersion Governs the Interaction Mechanism of Small Polar and Nonpolar Molecules in Metal-Organic Frameworks

Patrick Melix, Patrick Melix, Patrick Melix, Thomas Heine, Thomas Heine, Thomas Heine

Research output: Contribution to journalArticle

Abstract

In this work, we investigate the adsorption of chlorinated methanes (CHxCl4-x, x = 0-4) in a representative layer-pillar metal-organic framework, the flexible MOF Ni2(ndc)2(dabco) (ndc = 2,6-naphthalene-dicarboxylate, dabco = 1,4-diazabicyclo-[2.2.2]-octane), also known as DUT-8(Ni). The guest molecules show a systematic increase of polarizability with increasing number of chlorine atoms, whereas the dipole moment exceeds 2 debye for x = 2 and 3. Our ligand field molecular mechanics simulations show that, at first, counter-intuitively, the host-guest interactions are mainly characterized by London dispersion despite the molecular dipole moments reaching magnitudes as large as water. This highlights the importance of London dispersion interactions in the description of host-guest interactions.

Original languageEnglish
Pages (from-to)11985-11989
Number of pages5
JournalJournal of Physical Chemistry C
Volume124
Issue number22
DOIs
Publication statusPublished - 2020 Jun 4

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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