On isoelectronic fluorides [H3tren]ṡ(AlF6)ṡH2O, [H3tren]ṡ(AlF6)ṡHF, [H4tren]ṡ(AlF6)ṡ(F) and the iron analogue [H4tren]ṡ(FeF6)ṡ(F)

K. Adil, A. Ben Ali, M. Leblanc, V. Maisonneuve*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

[H3tren]ṡ(AlF6)ṡH2O, [H3tren]ṡ(AlF6)ṡHF and [H4tren]ṡ(MF6)ṡ(F) ( M = Al, Fe), are obtained by hydrothermal technique and microwave heating in the (Al(OH)3,FeF3)-tren-(HF/H2O)-ethanol system. Structure determinations are performed from single crystal X-ray diffraction data. All phases are built up from (MF6)3- anions linked by hydrogen bonds to [H3tren]3+ or [H4tren]4+ cations and to water or HF molecules or "isolated" fluoride anions. [H3tren]3+ and [H4tren]4+ cations adopt a "spider" shape configuration. Surprisingly, the HF molecule is strongly hydrogen bonded with one fluoride ion of the AlF6 octahedron ( dF⋯F = 2.38   Å ) in [H3tren]ṡ(AlF6)ṡHF while "isolated" fluoride ion is weakly coordinated by three hydrogen atoms in [H4tren]ṡ(MF6)ṡ(F). The evolution of the formulations, from [H3tren]ṡ(AlF6)ṡH2O to [H3tren]ṡ(AlF6)ṡHF and to [H4tren]ṡ(MF6)ṡ(F) ( M = Al, Fe), is linked with the increase of the HF content of the starting solution. The volumes per formula unit decrease from 321.3(1) Å3 and 320.6(1) Å3 in [H3tren]ṡ(AlF6)ṡH2O and [H3tren]ṡ(AlF6)ṡHF, respectively, to 298.5(4) Å3 in [H4tren]ṡ(AlF6)ṡ(F).

Original languageEnglish (US)
Pages (from-to)698-703
Number of pages6
JournalSolid State Sciences
Volume8
Issue number6
DOIs
StatePublished - Jun 2006
Externally publishedYes

Keywords

  • Fluoride
  • Tris-2-(aminoethyl)amine
  • X-ray diffraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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