Induced Smectic A Phase through Intermolecular Hydrogen Bonding: Part XVIII: Influence of p-n-Alkyl Benzoic Acids on Thermal and Phase Behavior of Hydrogen-Bonded Liquid Crystals

被引：4

作者：

Vijayalakshmi, K. ^{[1
]}

Sastry, S. Sreehari ^{[1
]}

机构：

[1] Acharya Nagarjuna Univ, Dept Phys, Nagarjuna Nagar 522510, Andhra Pradesh, India

来源：

ACTA PHYSICA POLONICA A | 2009年 / 115卷 / 03期

关键词：

ALKOXYBENZOIC ACIDS;

D O I：

10.12693/APhysPolA.115.690

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A novel series of intermolecular hydrogen bonded liquid crystals was synthesized with the mesogens of p-n-alkyl benzoic acids (nBA where n = 5 to 10) and p-(p'-octyloxy benzylidene)-cyano aniline (OBCA) moieties. The thermal and phase behaviors of these mesogens (nBA:OBCA) are studied by thermal polarizing optical microscopy and differential scanning calorimetry techniques. Induced smectic A phase with focal conic fan texture is observed in all the synthesized compounds. Moreover, the nematic phase present in all the pure p-n-alkyl benzoic acids (nBA where n = 6 to 10) is quenched in all the hydrogen bonded compounds (nBA:OBCA) and smectic A phase is induced. But, in the compound 5BA:OBCA the nematic phase is also present along with the induced smectic A phase. The structural elucidation pertaining to the formation and stabilization of intermolecular hydrogen bonding is carried out by a detailed IR spectral investigation.

引用

页码：690 / 693

页数：4

共 29 条

[1] Studies on the liquid crystalline behaviour of novel N-alkyl-substituted ester imides [J].

Bialecka-Florjanczyk, E ;

Melon-Ksyta, D ;

Orzeszko, A ;

Sledzinska, I ;

Przedmojski, J ;

Górecka, E .

LIQUID CRYSTALS, 2004, 31 (09) :1227-1234

[2] POLYMORPHIC IONIC MESOGENS OF SILVER(I) - IONIC MATERIALS EXHIBITING A THERMOTROPIC CUBIC MESOPHASE [J].

BRUCE, DW ;

DUNMUR, DA ;

HUDSON, SA ;

LALINDE, E ;

MAITLIS, PM ;

MCDONALD, MP ;

ORR, R ;

STYRING, P ;

CHERODIAN, AS ;

RICHARDSON, RM ;

FEIJOO, JL ;

UNGAR, G .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1991, 206 :79-+

[3] Combined DSC and vibrational studies on solid-solid transitions of isomeric (hydroxythiophenoxy)benzoic acids [J].

Carpaneto, L ;

Peluffo, C ;

Piaggio, P ;

Valenti, B .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1997, 93 (06) :1095-1100

[4] Hydrogen bonding in complexes of carboxylic acids with 1-alkylimidazoles: steric and isotopic effects on low barrier hydrogen bonding [J].

Cassidy, CS ;

Reinhardt, LA ;

Cleland, WW ;

Frey, PA .

JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2, 1999, (03) :635-641

[5]

CHANG J, 1994, J AM CHEM SOC, V116, P2655

[6] Designer crystals: intermolecular interactions, network structures and supramolecular synthons [J].

Desiraju, GR .

CHEMICAL COMMUNICATIONS, 1997, (16) :1475-1482

[7]

Desiraju GR., 1989, MAT SCI MONOGR, V54, pXIV

[8] INTRACHAIN FLEXIBILITY CONSTRAINTS ON PHASE STABILITIES AND ODD-EVEN EFFECTS IN MULTIPLE SMECTIC-A AND NEMATIC LIQUID-CRYSTALS [J].

DOWELL, F .

PHYSICAL REVIEW A, 1988, 38 (01) :382-394

[9]

GOVIND AS, 2002, THESIS RRI BANGALORE

[10]

GRAY GW, 1953, J CHEM SOC, P4179

← 1 2 3 →