Tunnelling motion of HF between the two oxygen lone pairs in the dimethyl ether-hydrogen fluoride complex: a pure rotational study.
The rotational spectrum of the dimethyl ether-hydrogen fluoride complex was assigned by millimetre-wave free-jet absorption spectroscopy. Fine details of the spectrum were resolved by FT microwave molecular-beam spectroscopy. The HF group acts as a proton donor and tunnels at a rate of 44178.2(7) MHz between the two oxygen lone pairs, which corresponds to an inversion barrier of 0.17 (1) kcal mol-1. The barrier to internal rotation of the two methyl groups is about 25% lower relative to the isolated ether.
Ottaviani
Paolo
P
Dipartimento di Chimica G. Ciamician dell'Università Via Selmi 2, 40126 Bologna, Italy.
Caminati
Walther
W
Velino
Biagio
B
Blanco
Susana
S
Lesarri
Alberto
A
López
Juan C
JC
Alonso
José L
JL