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 mol1. The barrier to internal rotation of the two methyl groups is about 25% lower relative to the isolated ether.
OTTAVIANI P., CAMINATI W., VELINO B., BLANCO S., LESARRI A., LOPEZ J.C., et al. (2004). Tunnelling Motion of HF Between the Two Oxygen Lone Pairs in the Dimethyl Ether-Hydrogen Fluoride Complex: A Pure Rotational Study. CHEMPHYSCHEM, 5, 336-341 [10.1002/cphc.200300954].
Tunnelling Motion of HF Between the Two Oxygen Lone Pairs in the Dimethyl Ether-Hydrogen Fluoride Complex: A Pure Rotational Study
OTTAVIANI, PAOLO;CAMINATI, WALTHER;VELINO, BIAGIO;
2004
Abstract
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 mol1. The barrier to internal rotation of the two methyl groups is about 25% lower relative to the isolated ether.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
