Reactions of Dichloroacetyl Fluoride in Superacidic Media

Steiner, Sebastian; Nitzer, Alexander; Jessen, Christoph and Kornath, Andreas J. (2024): Reactions of Dichloroacetyl Fluoride in Superacidic Media. In: Zeitschrift für anorganische und allgemeine Chemie, Vol. 650, No. 8

Abstract

Dichloroacetyl fluoride was investigated in the superacids HF/MF5 and DF/MF5 (M=As, Sb). The O-hemiprotonated species of dichloroacetyl fluoride is formed in the binary superacidic systems HF/MF5 and DF/MF5 (M=As, Sb) as hexafluoridoarsenates and hexafluoridoantimonates. With an excess of the strong Lewis acid SbF5 dichloroacetyl fluoride reacts under the formation of the oxonium salt [CCl2HCF2OX2][SbF6] in the superacidic system XF/SbF5 (X=H, D) after HF- or DF-addition, respectively. The colorless salts were characterized by low-temperature vibrational spectroscopy, NMR spectroscopy, and single-crystal X-ray diffraction. [CCl2HC(OH)F][(CCl2HCOF)2H][SbF6][Sb2F11] and [CCl2HCF2OH2][SbF6] crystallize in the monoclinic space groups P21/c and P21/m, respectively, with two formula units per unit cell each. The crystal structure of the oxonium salt shows strong O(−H)⋅⋅⋅F hydrogen bonds and strong F⋅⋅⋅F interactions. The experimental data are discussed together with quantum chemical calculations at the ωB97XD/aug-cc-pVTZ-level of theory.

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 0044-2313
• Language: English