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Ordering in the nematic mesophase of a rapidly spinning sample
Author(s) -
Teeäär R.,
Alla M.,
Lippmaa E.
Publication year - 1982
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.1270190305
Subject(s) - liquid crystal , mesophase , spinning , magic angle , anisotropy , perpendicular , eutectic system , isotropy , materials science , phase (matter) , magic angle spinning , condensed matter physics , magnetic field , crystallography , nuclear magnetic resonance , chemistry , optics , nuclear magnetic resonance spectroscopy , physics , microstructure , organic chemistry , composite material , geometry , mathematics , quantum mechanics
The high resolution 13 C NMR spectrum of an eutectic mixture of N‐(p ‐methoxybenzylidene)‐ p‐n ‐butylaniline and N‐(p ‐ethoxybenzylidene)‐ p‐n ‐butylaniline has been measured as a function of the spinning angle θ between the rotor axis and the magnetic field. The influence of a strong magnetic field and rapid sample spinning gives rise to a specific orientation of this nematic mesophase; if 0 < θ < 54°44′; the director of the nematic phase is oriented in parallel with the rotor axis, and if 54°44′; < θ <90° it is perpendicular to the rotor axis. At the exact magic angle a nematic sample displays the chemical shifts of the corresponding isotropic liquid. Nematic order is retained at all other director‐field angle values, thus allowing chemical shift anisotropy measurements of the nematic sample or of compounds dissolved therein.