AN INTERPRETATION OF NMR DATA OF 4-ETHOXY-4'-CYANOBIPHENYL IN THE NEMATIC STATE - INTERNAL-ROTATION AROUND THE O-CH2 BOND

被引：3

作者：

KIMURA, N ^{[1
]}

ABE, A ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,DEPT POLYMER CHEM,2-12-1 OOKAYAMA,MEGURO KU,TOKYO 152,JAPAN

来源：

POLYMER BULLETIN | 1992年 / 28卷 / 01期

关键词：

D O I：

10.1007/BF01045642

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Conformation of the ethoxy tail flanking the cyanobiphenyl core has been studied in the liquid-crystalline state. The compound exhibits a monotropic nematic phase at 91.9-degrees-C. The H-2 NMR analysis indicates that the fraction of the trans conformer around the O-CH2 bond amounts to 0.79 at the temperature slightly below the isotropic-to-nematic transition point. The result was found to be consistent with those reported for some related compounds by Celebre et al.

引用

页码：81 / 85

页数：5

共 14 条

[1]

ABE A, 1988, POLYM BULL, V19, P403

[2] ORIENTATIONAL CHARACTERISTICS OF MAIN-CHAIN POLYMER LIQUID-CRYSTALS AS REVEALED BY THE ROTATIONAL ISOMERIC STATE ANALYSIS OF DEUTERIUM NMR-SPECTRA [J].

ABE, A ;

FURUYA, H .

MACROMOLECULES, 1989, 22 (07) :2982-2987

[3] MOLECULAR ORDERING IN LIQUID-CRYSTALS CARRYING FLEXIBLE HYDROCARBON TAILS - A ROTATIONAL ISOMERIC STATE ANALYSIS OF D-NMR DATA OF EMSLEY ET AL ON 4-NORMAL-ALKYL-4'-CYANOBIPHENYLS (NCB) [J].

ABE, A ;

FURUYA, H .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1988, 159 :99-114

[4]

ABE A, UNPUB

[5] METHOXY GROUP NONPLANARITY IN OMICRON-DIMETHOXYBENZENES - SIMPLE PREDICTIVE MODELS FOR CONFORMATIONS AND ROTATIONAL BARRIERS IN ALKOXYAROMATICS [J].

ANDERSON, GM ;

KOLLMAN, PA ;

DOMELSMITH, LN ;

HOUK, KN .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1979, 101 (09) :2344-2352

[6]

CATALANO D, 1985, GAZZ CHIM ITAL, V115, P233

[7] AN INVESTIGATION BY NMR-SPECTROSCOPY OF THE DEPENDENCE ON INTERNAL MOTION OF THE ORIENTATIONAL ORDERING OF ETHOXYBENZENE AND 4-FLUOROETHOXYBENZENE WHEN DISSOLVED IN A NEMATIC SOLVENT [J].

CELEBRE, G ;

LONGERI, M ;

EMSLEY, JW .

LIQUID CRYSTALS, 1989, 6 (06) :689-700

[8] AN INVESTIGATION OF THE POTENTIAL GOVERNING ROTATION ABOUT THE O-CH2 BOND IN 4-CHLOROETHOXYBENZENE BY COMPARING OBSERVED AND CALCULATED DIPOLAR COUPLINGS OBTAINED FOR A SAMPLE DISSOLVED IN A NEMATIC SOLVENT [J].

CELEBRE, G ;

LONGERI, M ;

EMSLEY, JW .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1988, 84 :1041-1052

[9] THE CONFORMATION AND ORIENTATIONAL ORDER OF 1-ETHOXY-4-CHLOROBENZENE DISSOLVED IN A NEMATIC LIQUID-CRYSTAL [J].

EMSLEY, JW ;

HEATON, NJ ;

KIMMINGS, MK ;

LONGERI, M .

MOLECULAR PHYSICS, 1987, 61 (02) :433-442

[10] THE ORIENTATIONAL ORDER OF NEMATOGENIC MOLECULES WITH A FLEXIBLE CORE - A DRAMATIC ODD EVEN EFFECT [J].

EMSLEY, JW ;

LUCKHURST, GR ;

SHILSTONE, GN .

MOLECULAR PHYSICS, 1984, 53 (04) :1023-1028

← 1 2 →