A MAXIMUM-ENTROPY ANALYSIS OF THE PROBLEM OF THE ROTAMERIC DISTRIBUTION FOR SUBSTITUTED BIPHENYLS STUDIED BY H-1 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY IN NEMATIC LIQUID-CRYSTALS

被引：53

作者：

CATALANO, D ^{[1
]}

DIBARI, L ^{[1
]}

VERACINI, CA ^{[1
]}

SHILSTONE, GN ^{[1
]}

ZANNONI, C ^{[1
]}

机构：

[1] UNIV BOLOGNA,DIPARTIMENTO CHIM FIS & INORGAN,I-40136 BOLOGNA,ITALY

来源：

JOURNAL OF CHEMICAL PHYSICS | 1991年 / 94卷 / 05期

关键词：

D O I：

10.1063/1.460669

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The statistical principle of maximum entropy is applied to the analysis of dipolar couplings from H-1 NMR of nonrigid molecules dissolved in liquid-crystalline phases. A distribution function for the orientational and inter-ring angles is so obtained. The most probable internal angle phi is determined for 4,4'-dichlorobiphenyl (phi = 34-degrees) in the nematic phase of I52, 4-pentyl-4'-cyanobiphenyl (phi = 32-degrees) and 4'-Br-4-Cl-2,6-difluorobiphenyl (phi = 42-degrees) in EBBA. The physical reliability of the distributions determined is discussed. The maximum-entropy treatment seems to indicate a limit for the information on the internal motion obtainable from the experimental data.

引用

页码：3928 / 3935

页数：8

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