Synthesis, structure, and thermal properties of fluorinated cesium beta-diketonates

Abstract

Four fluorinated cesium beta-diketonates, Cs(CF₃COCHCOCF₃) (Cs(hfac)), Cs(CF₃COCHCOCH₃) (Cs(tfac)), Cs(OH₂)((Me)₃CCOCHCOCF₃) (Cs(OH₂)(ptac)), and Cs(OH₂)(PhCOCHCOCF₃) (Cs(OH₂)(btfac)), were synthesized by interaction of the corresponding beta-diketone and Cs₂CO₃ in Et₂O. The formation of Сs(CF₃C(OH)₂CH₂C(OH)₂CF₃)(CF₃COO) or Cs(CF₃C(OH)₂CH₂COCH₃)(tfac) was shown to be dependent on the reaction conditions. The compounds were characterized by elemental analysis, single crystal X-ray diffraction, and TG/DTA analysis. All compounds have ionic structures organized into pseudo chains (in the case of Cs(hfac) and Cs(CF₃C(OH)₂CH₂COCH₃)(tfac)) or pseudo layers (in other cases). According to the TG data Cs(hfac), Cs(tfac), Cs(OH₂)(ptac,) and Cs(OH₂)(btfac) decompose in inert atmosphere within the temperature range 30–550 °C.

Keywords:

• Cesium
• Beta-diketonates
• Single crystal X-ray analysis
• Thermogravimetry
• Differential thermal analysis

Acknowledgements

The work was supported by RFBR Grant No. 12-03-31277 mol_a.