MoF5 revisited. A comprehensive study of MoF5

Research output: Contribution to journalArticleScientificpeer-review


  • Riane E. Stene
  • Benjamin Scheibe
  • Clemens Pietzonka
  • Antti J. Karttunen
  • Winfried Petry
  • Florian Kraus

Research units

  • University of Marburg
  • Technical University of Munich


While the properties of molybdenum pentafluoride, MoF5, have been investigated in the past, there exists no comprehensive study of the compound. Additionally, many of these studies appear incoherent and offer contradictory explanations of some of the observed properties of MoF5. Consequently, a comprehensive examination of MoF5 is presented here, including a redetermination of the crystal structure of MoF5 using single crystal and powder X-ray diffraction, the reevaluation of its IR, Raman and UV–Vis spectrum, and a study of its density (3.50(2) g/cm3 @ 25 °C) and magnetic properties. Additionally, density functional theory (DFT) calculations were performed on the gas phase molecule Mo4F20 to provide a discussion of properties realized during investigation. Single crystal X-ray diffraction showed MoF5 to crystalize in the monoclinic, C2/m space group, as isolated tetramers having the formula Mo4F20. Magnetic measurements showed that when “MoF5” is cooled from the melt fast enough, paramagnetic species with S = ½ are present together with S = 0 species. These species may be described using the formula (MoF5)n (n = odd) and (MoF5)n (n = even, presumably n = 4). From the measurements, the content of the S = ½ species is estimated to be 6%. The preferred species of MoF5 under ambient conditions is Mo4F20.


Original languageEnglish
Pages (from-to)171-179
Number of pages9
JournalJournal of Fluorine Chemistry
Publication statusPublished - 1 Jul 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Crystal structure, Density, Fluoride, IR spectroscopy, Magnetic properties, MoF type, Molybdenum, Raman spectroscopy, UV–Vis spectroscopy, WOF type

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