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

共 27 条

[1]

Alagona G., UNPUB

[2]

ALMENINGEN A, 1958, NOR VIDENSK SELSK SK

[3] ELECTRON DIFFRACTION STUDIES ON FLUORODERIVATIVES OF BIPHENYL [J].

BASTIANSEN, O ;

SMEDVIK, L .

ACTA CHEMICA SCANDINAVICA, 1954, 8 (09) :1593-1598

[4] EFFECTS OF INTERACTION BETWEEN MOLECULAR INTERNAL MOTION AND REORIENTATION ON NMR OF ANISOTROPIC LIQUIDS [J].

BURNELL, EE .

JOURNAL OF MAGNETIC RESONANCE, 1980, 39 (03) :461-480

[5] THE ANGLE OF TWIST BETWEEN THE 2 PHENYL RINGS IN THE NEMATIC LIQUID-CRYSTAL 4-NORMAL-PENTYL-4'-CYANOBIPHENYL [J].

CELEBRE, G ;

LONGERI, M ;

SICILIA, E ;

EMSLEY, JW .

LIQUID CRYSTALS, 1990, 7 (05) :731-737

[6] AN INTERNAL ORDER APPROACH TO THE INVESTIGATION OF INTRAMOLECULAR ROTATIONS IN LIQUID-CRYSTALS BY NMR - 3-PHENYL-THIOPHENE IN PCH AND PHASE-IV [J].

DIBARI, L ;

FORTE, C ;

VERACINI, CA ;

ZANNONI, C .

CHEMICAL PHYSICS LETTERS, 1988, 143 (03) :263-269

[7]

DIEHL P, 1985, NATO ASI SERIES C, V141

[8]

DIEHL P, 1969, NMR BASIC PRINCIPLES, V1

[9]

DROBNY G, 1979, FARADAY DIV CHEM SOC, V13, P49

[10] A THEORY OF ORIENTATIONAL ORDERING IN UNIAXIAL LIQUID-CRYSTALS COMPOSED OF MOLECULES WITH ALKYL CHAINS [J].

EMSLEY, JW ;

LUCKHURST, GR ;

STOCKLEY, CP .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1982, 381 (1780) :117-138

← 1 2 3 →