Proton magnetic shielding anisotropy in acetylene

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Abstract
A high resolution N.M.R. study of acetylene in different liquid crystals is reported. The anisotropy in proton chemical shift has been measured accurately. The present result differs considerably from the values previously reported and is found to be independent of liquid crystal medium, concentration or density and reference of chemical shift measurement. Additional chemical shift data in gaseous acetylene and methane-tetramethylsilane (TMS) relative shifts in nematic and isotropic phases of the liquid crystals are also given.