The impact of host-guest interactions on the dielectric properties of MFM-300 materials

Xi Chen, Sergei Sapchenko, Wanpeng Lu, Ming Li, Meng He, Yinlin Chen, Mark D Frogley, Ivan da Silva, Sihai Yang, Martin Schroder

Research output: Contribution to journalArticlepeer-review

Abstract

Metal–organic framework (MOF) materials are attracting increasing interest in the field of electronics due to their structural diversity, intrinsic porosity, and designable host-guest interactions. Here, we report the dielectric properties of a series of robust materials, MFM-300(M) (M = Al, Sc, Cr, Fe, Ga, In) when exposed to different guest molecules. MFM-300(Fe) exhibits the most notable increase in dielectric constant to 35.3± 0.30 at 10 kHz upon adsorption of NH3. Structural analysis suggests that the electron delocalisation induced by host-guest interactions between NH3 and the MOF host, as confirmed by neutron powder diffraction studies, leads to structural polarisation resulting in a high dielectric constant for NH3@MFM-300(Fe). This is further supported by ligand-to-metal charge-transfer transitions observed by solid-state UV/Vis spectroscopy. The high detection sensitivity and stability to NH3 suggests that MFM-300(Fe) may act as a powerful dielectric-based sensor for NH3.
Original languageEnglish
JournalInorganic Chemistry
Publication statusAccepted/In press - 16 Aug 2023

Keywords

  • MOFs
  • dielectric constant
  • host-guest interaction
  • ammonia
  • impedance spectroscopy

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