Cholesterol-based unsymmetrical Schiff's base dimer terminated with 4-alkoxy-5-phenylthiophene unit: synthesis and characterisation

被引：29
作者：
Majumdar, K. C. [1 ]
Ghosh, Tapas [1 ]
Chakravorty, Santanu [1 ]
Pal, Nilashis [1 ]
Rao, D. S. Shankar [2 ]
Prasad, S. Krishna [2 ]
机构：
[1] Univ Kalyani, Dept Chem, Kalyani, W Bengal, India
[2] CLCR, Bangalore, Karnataka, India
来源：
LIQUID CRYSTALS | 2010年 / 37卷 / 12期
关键词：
thiophene; dimers; SmA; SmC*; N*; TGB phase; HRXRD; LIQUID-CRYSTAL DIMERS; PHOTOACTIVE DIMESOGEN; MESOMORPHIC BEHAVIOR; THERMAL-BEHAVIOR; ASTERISK PHASE; OLIGOMERS; INTERCALATE; MONOMERS; MOIETY; TGBA;
D O I：
10.1080/02678292.2010.526721
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A series of unsymmetrical cholesterol based dimers have been synthesised and characterised. All the dimers possess a cholesterol unit connected with a 4-alkoxy-5-phenylthiophene unit through Schiff's base linkage. The length of the terminal alkyl and the alkyl spacer has been varied. All the dimers exhibit mesomorphism. Four dimers possess only the cholesteric (chiral nematic, N*) phase. One of the dimers showed smectic A (SmA) and N* phases whereas the other dimer displayed SmA, smectic chiral C (SmC*), N* and twist grain boundary (TGB) phases.
引用
收藏
页码：1539 / 1547
页数：9
相关论文
共 53 条
  • [1] Electroluminescent segmented liquid crystalline trimers
    Aldred, M. P.
    Hudson, R.
    Kitney, S. P.
    Vlachos, P.
    Liedtke, A.
    Woon, K. L.
    O'Neill, M.
    Kelly, S. M.
    [J]. LIQUID CRYSTALS, 2008, 35 (04) : 413 - 427
  • [2] LOW MOLAR MASS LIQUID-CRYSTALLINE GLASSES - PREPARATION AND PROPERTIES OF THE ALPHA-(4-CYANOBIPHENYL-4'-OXY)-OMEGA-(1-PYRENIMINEBENZYLIDENE-4'-OXY)ALKANES
    ATTARD, GS
    IMRIE, CT
    KARASZ, FE
    [J]. CHEMISTRY OF MATERIALS, 1992, 4 (06) : 1246 - 1253
  • [3] LIQUID-CRYSTALLINE AND GLASS-FORMING DIMERS DERIVED FROM 1-AMINOPYRENE
    ATTARD, GS
    IMRIE, CT
    [J]. LIQUID CRYSTALS, 1992, 11 (05) : 785 - 789
  • [4] ASYMMETRIC DIMERIC LIQUID-CRYSTALS WITH CHARGE-TRANSFER GROUPS
    ATTARD, GS
    GARNETT, S
    HICKMAN, CG
    IMRIE, CT
    TAYLOR, L
    [J]. LIQUID CRYSTALS, 1990, 7 (04) : 495 - 508
  • [5] NONSYMMETRICAL DIMERIC LIQUID-CRYSTALS - THE PREPARATION AND PROPERTIES OF THE ALPHA-(4-CYANOBIPHENYL-4'-YLOXY)-OMEGA-(4-N-ALKYLANILINEBENZYLIDENE-4'-OXY)ALKANES
    ATTARD, GS
    DATE, RW
    IMRIE, CT
    LUCKHURST, GR
    ROSKILLY, SJ
    SEDDON, JM
    TAYLOR, L
    [J]. LIQUID CRYSTALS, 1994, 16 (04) : 529 - 581
  • [6] Banana-shaped dopants for flexoelectric nematic mixtures
    Aziz, Nayar
    Kelly, Stephen M.
    Duffy, Warren
    Goulding, Mark
    [J]. LIQUID CRYSTALS, 2008, 35 (11) : 1279 - 1292
  • [7] Non-symmetric liquid crystal dimers containing the 4-nitrobenzohydrazide group: synthesis and mesomorphic behaviour
    Bai, Binglian
    Wang, Haitao
    Zhang, Peng
    Qu, Songnan
    Li, Fan
    Yu, Zhixin
    Long, Beihong
    Li, Min
    [J]. LIQUID CRYSTALS, 2008, 35 (07) : 793 - 798
  • [8] Oligothiophene lsothiocyanates as a new class of fluorescent markers for biopolymers
    Barbarella, G
    Zambianchi, M
    Pudova, O
    Paladini, V
    Ventola, A
    Cipriani, F
    Gigli, G
    Cingolani, R
    Citro, G
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (47) : 11600 - 11607
  • [9] Bauerle P., 1998, Oligothiophenes
  • [10] Synthesis and characterisation of thermotropic liquid-crystalline properties of azomethine dimers
    Bhowmik, Pradip K.
    Han, Haesook
    Nedeltchev, Alexi K.
    Mandal, Hari D.
    Jimenez-Hernandez, Jose A.
    McGannon, Patrick M.
    Lopez, Leonardo
    Kang, Shin-Woong
    Kumar, Satyendra
    [J]. LIQUID CRYSTALS, 2009, 36 (12) : 1389 - 1399
123456