A high-resolution N.M.R. study of benzonitrile, p-nitrobenzonitrile and p-dinitrobenzene in different liquid crystals is reported. Geometrical changes occurring in the benzene ring of these molecules are discussed and compared. A qualitative interpretation of geometric data with a semiempirical iterative extended Hückel (IEH) calculation is presented.
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Veracini et al. (1972) studied this question.
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