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Adducts of alcohols with ethers: the rotational spectrum of isopropanol-dimethyl ether
Luca Evangelisti1, Federico Pesci, Walther Caminati
1Dipartimento di Chimica G. Ciamician dell'Università, Via Selmi 2, I-40126 Bologna, Italy.
Abstract:
The rotational spectra of three isotopologues of the isopropanol-dimethyl ether molecular complex have been measured with pulsed jet Fourier transform microwave spectroscopy. In the complex, isopropanol acts as a proton donor and takes a gauche conformation. The H → D isotopic substitution of the hydroxylic hydrogen participating in the O-H···O hydrogen bond produces an increase of the B and C rotational constants, according to the shrinkage of the O···O distance of about 7 mÅ, underlying and sizing the associated Ubbelohde effect.
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