The structure of 2,2'-difluorobiphenyl in solid crystalline and liquid crystalline phases
作者:
B. ALDRIDGE,
G. DE LUCA,
M. EDGAR,
S. J. EDGAR,
J. W. EMSLEY,
M. I. C. FURBY,
M. WEBSTER,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 24,
issue 4
页码: 569-581
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998207046
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The structure of 2,2-difluorobiphenyl in the solid, crystalline phase has been determined by X-ray diffraction. In this phase the molecules are all in a single conformation having the two fluorine nuclei in a syn -arrangment, with the two ring normals at 58 to one another. The structure of the same molecule, but dissolved in a liquid crystalline solvent has been investigated by NMR spectroscopy. In the liquid crystalline phase there is rotation about the inter-ring bond through an angle phi, with a probability distribution P(phi) which has an absolute maximum at the syn-form with phi about 51. There is also a second maximum in P(phi) at about 130, corresponding to the anti-form. The syn- and anti-forms are present in the approximate ratio 0.58:0.42.
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