The structure of 2,2′-difluorobiphenyl in solid crystalline and liquid crystalline phases

被引：14

作者：

Aldridge, B ^{[1
]}

De Luca, G ^{[1
]}

Edgar, M ^{[1
]}

Edgar, SJ ^{[1
]}

Emsley, JW ^{[1
]}

Furby, MIC ^{[1
]}

Webster, M ^{[1
]}

机构：

[1] Univ Southampton, Dept Chem, Southampton SO17 1BJ, Hants, England

来源：

LIQUID CRYSTALS | 1998年 / 24卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1080/026782998207046

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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 degrees 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 degrees. There is also a second maximum in P(phi) at about 130 degrees, corresponding to the anti-form. The syn- and anti-forms are present in the approximate ratio 0.58:0.42.

引用

页码：569 / 581

页数：13