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Conformational problem of alkanes in liquid crystals by NMR spectroscopy: a mini‐review
Author(s) -
Weber Adrian C. J.,
Chen Daniel H. J.
Publication year - 2014
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4124
Subject(s) - chemistry , nuclear magnetic resonance spectroscopy , spectroscopy , transverse relaxation optimized spectroscopy , computational chemistry , nuclear magnetic resonance , crystallography , fluorine 19 nmr , organic chemistry , physics , quantum mechanics
Recent discoveries of the role of alkane flexibility in determining liquid‐crystal behaviour are surveyed. With the impetus for understanding the alkane conformational problem established, recent model dependent 1 H NMR work on the topic will be reviewed where progress is made but the need to circumvent models eventually becomes evident. A closer look at the rigid basic units of alkanes will provide the way forward where it is shown that the orientational ordering and anisotropic potentials of these molecules dissolved in liquid crystals scale with each other. Once this relationship is established, a series of works using anisotropic and isotropic 1 H NMR spectroscopy to study alkane conformational statistics will be covered, wherein the influence of the gas, isotropic condensed and anisotropic condensed phases will be described. Copyright © 2014 John Wiley & Sons, Ltd.