Understanding and Controlling the Dielectric Response of Metal–Organic Frameworks

Matthew R. Ryder, Lorenzo Donà, Jenny G. Vitillo, Bartolomeo Civalleri

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Metal–organic framework (MOF) materials have recently been shown to have promising electronic and dielectric properties. This study involves investigating a diverse range of MOFs to rationalise how the different building blocks that form the structure can affect the electronic properties and dielectric response. The analysis, based on quantum mechanical calculations, includes the contribution from the metals involved, the organic linkers and the symmetry and topology of the framework and makes suggestions for future work on low-κ dielectric MOFs. The results confirm that the band gap is primarily due to the electronic levels of the organic linkers and that tuning the band gap can be easily achieved either by linker functionalisation or by increasing the aromaticity. The relevance of simple structure–property relationships for different families of isoreticular MOFs through the use of Hammett sigma constants is also highlighted. It is also shown that the polarisability of the framework can be tuned comparably to the band gap. However, the expected low static dielectric constant is less influenced by the composition of the MOF and can be modified by acting on the crystal structure. Indeed, it is shown that it can be directly linked to the framework porosity.

Original languageEnglish (US)
Pages (from-to)308-316
Number of pages9
JournalChemPlusChem
Volume83
Issue number4
DOIs
StatePublished - Apr 2018

Bibliographical note

Funding Information:
M.R.R. thanks the UK Engineering and Physical Sciences Research Council (EPSRC) for a Doctoral Prize Fellowship and the Rutherford Appleton Laboratory (RAL) for access to the SCARF cluster and additional computing resources. B.C. thanks S. Novarino and L. Valenzano for their initial contribution to this study.

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • density functional calculations
  • dielectric properties
  • electronic properties
  • metal–organic frameworks
  • porous materials

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