Potassium and Rubidium Benzoyltrifluoroacetonates: A Crystal Chemical Study and Thermal Properties

D. V. Kochelakov, E. S. Vikulova, N. V. Kuratieva

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Complexes of potassium and rubidium with benzoyltrifluoroacetone (C6H5COCH2COCF3 = Hbtfac) of the composition M(btfac)(H2O)x, where M = K, Rb, x ∈ [0.5 … 1] are synthesized for the first time. The compounds are characterized by the elemental analysis and IR spectroscopy. By X-ray crystallography the crystal structures of M(btfac)(H2O) are determined: for the potassium complex a = 10.4955(4) Å, b = 13.9715(6) Å, c = 7.5197(3) Å, α = β = γ = 90°, space group Pcc2, Z = 4, R = 0.0242 [I > 2σ(I)]; for the rubidium complex a = 10.6363(8) Å, b = 27.9354(18) Å, c = 7.7205(5) Å, α = 90°, β = 93.759(2)°, γ = 90°, space group P21/c, Z = 4, R = 0.0287. The compounds represent layered coordination polymers where the metal cation coordinates eight oxygen atoms of four β-diketonate anions or four fluorine atoms of four β-diketonate ligands and four oxygen atoms of water molecules. The structures of M(btfac)(H2O) complexes with M = K, Rb, Cs are compared and the common structural motifs are revealed. From the thermogravimetry data the melting points and temperature ranges of the stability of anhydrous complexes are found.

Original languageEnglish
Pages (from-to)439-448
Number of pages10
JournalJournal of Structural Chemistry
Issue number3
Publication statusPublished - 1 Mar 2020


  • benzoyltrifluoroacetone
  • potassium
  • rubidium
  • thermal analysis
  • X-ray crystallography


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