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Structure of dibenzofuran and dibenzothiophene: Proton NMR study in nematic phases
Author(s) -
Arumugam S.,
Kunwar A. C.,
Khetrapal C. L.
Publication year - 1984
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270220904
Subject(s) - dibenzofuran , dibenzothiophene , liquid crystal , materials science , proton nmr , proton , crystallography , chemistry , organic chemistry , physics , nuclear physics , sulfur , optoelectronics , metallurgy
Proton NMR spectra of dibenzofuran and dibenzothiophene were investigated in the nematic phase of liquid crystals. Dipolar couplings obtained from the spectral analysis were used to derive the inter‐proton distance ratios. Deviations from planarity were observed in both molecules, and an attempt was made to determine the extent of non‐planarity. Differences in the relative inter‐proton distances in the two molecules are explained in terms of the bond polarization hypothesis and the van der Waals and the covalent radii of the oxygen and sulphur heteroatoms.