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Abstract <p>A critical review of studies on attempts to synthesize FeF<sub>4</sub> molecules and mass spectrometric investigations of the proposed reaction equilibria involving them does not provide a definitive answer regarding the existence of this compound. However, when combined with the results of infrared spectroscopy studies in noble gas matrices and quantum-mechanical calculations, reliable values for the bond dissociation energy <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11502_2025_3792_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="24" /> </InlineMediaObject> <EquationSource Format="TEX">\(D_{0}^{ \circ }\)</EquationSource> <!--InrgChem2560225Nikitin-m1--> </InlineEquation>(FeF<sub>3</sub> – F) = 195 ± 10 kJ/mol and the standard enthalpy of formation of gaseous iron(IV) fluoride Δ<sub><i>f</i></sub><i>H</i>°(FeF<sub>4</sub>, 0) = –843 ± 10 kJ/mol can be recommended. A comparison with the thermodynamic characteristics of similar tetrafluorides is provided.</p>

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Thermodynamic Characteristics of Gaseous Iron(IV) Fluoride

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • M. I. Nikitin,
  • I. P. Malkerova,
  • A. S. Alikhanyan

摘要

Abstract

A critical review of studies on attempts to synthesize FeF4 molecules and mass spectrometric investigations of the proposed reaction equilibria involving them does not provide a definitive answer regarding the existence of this compound. However, when combined with the results of infrared spectroscopy studies in noble gas matrices and quantum-mechanical calculations, reliable values for the bond dissociation energy \(D_{0}^{ \circ }\) (FeF3 – F) = 195 ± 10 kJ/mol and the standard enthalpy of formation of gaseous iron(IV) fluoride ΔfH°(FeF4, 0) = –843 ± 10 kJ/mol can be recommended. A comparison with the thermodynamic characteristics of similar tetrafluorides is provided.