title: Conformational equilibria in adducts of alcohols with ethers: the rotational spectrum of ethylalcohol-dimethylether.
abstract: The rotational spectra of two conformers of the molecular complex ethylalcohol-dimethylether were measured with pulsed-jet Fourier transform microwave spectroscopy. Both trans and gauche conformations of ethylalcohol are preserved in the complex, originating two conformations with dimethylether as the proton accepting unit. A switch of the conformational stability of ethyl alcohol is observed upon complexation with dimethyl ether, with the gauche form becoming the global minimum. The investigation of the O-D deuterated species allowed observing quantitatively the Ubbelohde effect, which is the shrinkage of the O⋅⋅⋅O distance of about 6 mÅ upon H→D isotopic substitution of the hydroxylic hydrogen participating in the O-H⋅⋅⋅O hydrogen bond.
authors.affiliation: Department of Chemistry, University of Bologna, Via Selmi 2, 40126, Bologna, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Evangelisti
authors.forename: Gang
authors.initials: G
authors.lastname: Feng
authors.forename: Roberto
authors.initials: R
authors.lastname: Rizzato
authors.forename: Walther
authors.initials: W
authors.lastname: Caminati