Selenourea was investigated in the binary superacidic media XF/MF 5 (X = H, D; M = As, Sb). The protonation selectively takes place at the selenium atom leading to the corresponding salts [(X 2 N) 2 CSeX] + [MF 6 ] -. The characterization of the colorless salts was performed by low temperature vibrational spectroscopy. In the case of [(H 2 N) 2 CSeH] + [SbF 6 ]a sin- [a]
The syntheses of [H3C(O)CC(OH)2][MF6] and [H3C(OH)CC(OH)2][MF6]2 (M=As, Sb) by reacting pyruvic acid in the superacidic systems HF/AsF5 and HF/SbF5 are reported. The salts were characterized by low‐temperature vibrational spectroscopy and in the cases of [H3C(O)CC(OH)2][SbF6] and [H3C(OH)CC(OH)2][SbF6]2 ⋅ HF by X‐ray crystal structure analyses. The experimental results are discussed together with quantum chemical calculations. Remarkably, the bond distance and the twisting angle around the central C−C bond are unaffected by the protonations despite increasing coulombic repulsion. The crystal structure reveals short interionic interactions that have a considerable influence on the C−C bond.
This cover picture shows the plain superelectrophile [C2(OH)3Me]2+ that is constructed by the superacidic systems HF/MF5 (M=As, Sb) from pyruvic acid. The analysis of the excavated single crystals showed strong C⋅⋅⋅F interactions, which are illustrated in the top right. These interactions shorten the central C−C bond. This is represented by the two bulldozers that are steered by HF molecules working on the construction site, pushing together the C−C bond. More details are found in the research article by Alan Virmani, Martina Pfeiffer, Christoph Jessen, Yvonne Morgenstern, and Andreas J. Kornath.(DOI: 10.1002/zaac.202200005).
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