Affiliation:
1. 1Institut für Elektrowerkstoffe und Physikalisches Institut der Universität Freiburg i. Br.
Abstract
Nematic liquids are used as solvents for NMR investigations. By this method a partial orientation of the solute molecules is obtained, causing splittings of the NMR signals by intramolecular direct dipole-dipole interactions. The high resolution spectra of benzene, some derivatives of benzene, and 4-chlorobenzoic acid are reported. As solvents nematic melts of 4.4′-di-n-hexoxy- and 4.4′-di-n-heptoxyazoxybenzene and 4-n-butoxybenzoic acid were used. The linewidth remains small despite the very strong direct dipole-dipole interactions that could be observed in some cases. With benzene and 1.3.5-trichlorobenzene the anisotropy of the screening has been determined. It was found Δσ = σξξ — (σξξ+ σηη)/2 = -2.88 x 10-6 for benzene and △σ= -4.91 x 10-6 for 1.3.5-trichlorobenzene (ξ-axes normal to molecular plane).
Subject
Physical and Theoretical Chemistry,General Physics and Astronomy,Mathematical Physics
Cited by
73 articles.
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