On the nematic-nematic phase transition in mixtures composed of sheet-shaped palladium organyls and apolar organic solvents

被引:33
作者
Usoltseva, N
Hauck, G
Koswig, HD
Praefcke, K
Heinrich, B
机构
[1] TECH UNIV BERLIN,INST ORGAN CHEM,D-10623 BERLIN,GERMANY
[2] IVANOVO STATE UNIV,LIQUID CRYSTAL LAB,IVANOVO 153025,RUSSIA
[3] TECH UNIV BERLIN,AG FLUSSIGKRISTALLE,IWAN N STRANSKI INST PHYS & THEORET CHEM,D-10117 BERLIN,GERMANY
关键词
D O I
10.1080/02678299608033166
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The three sheet-shaped palladium organyls la-e exhibit lyotropic nematic properties in apolar organic solvents. The occurrence of two nematic lyomesophases was verified by the investigation of the orientational properties of these liquid crystalline systems. In cells with obliquely deposited SiOx layers, the director of the high temperature phase N-2 is aligned in a homogeneous, planar manner. In the low temperature phase N-1, a different orientational pattern is observed. The specific pattern type depends on the deposition conditions of the SiOx layers. In samples homeotropically aligned in the N-2 phase, the director is tilted away from the cell normal after the transition into the N-1 phase. These changes of orientation are reversible. The experimental observations presented here support our proposed model for the structural change at the nematic-nematic phase transition.
引用
收藏
页码:731 / 739
页数:9
相关论文
共 19 条
  • [1] [Anonymous], MOL CRYST LIQ CRYST
  • [2] THE CHROMONIC PHASES OF DYES
    ATTWOOD, TK
    LYDON, JE
    JONES, F
    [J]. LIQUID CRYSTALS, 1986, 1 (06) : 499 - 507
  • [3] BODEN N, 1986, LIQ CRYST, V1, P109, DOI 10.1080/02678298608086498
  • [4] CHROMONIC LYOMESOPHASES FORMED BY THE SELF-ASSEMBLY OF THE CYCLIC DINUCLEOTIDE D(CGPGP)
    BONAZZI, S
    DEMORAIS, MM
    GARBESI, A
    GOTTARELLI, G
    MARIANI, P
    SPADA, GP
    [J]. LIQUID CRYSTALS, 1991, 10 (04) : 495 - 506
  • [5] BURRI C, 1950, POLARISATIONSMIKROSK, P191
  • [6] FORREST BJ, 1994, CHEM PHYS, V81, P1
  • [8] BISTABLE ANCHORING OF NEMATICS ON SIO FILMS
    JEROME, B
    PIERANSKI, P
    BOIX, M
    [J]. EUROPHYSICS LETTERS, 1988, 5 (08): : 693 - 696
  • [9] LUCKHURST GR, 1995, COMMUNICATION 0619
  • [10] MULTINUCLEAR PALLADIUM ORGANYLS - NOVEL STRUCTURES AND PROPERTIES OF DISK-LIKE METALLOMESOGENS
    PRAEFCKE, K
    SINGER, D
    GUNDOGAN, B
    [J]. MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1992, 223 : 181 - 195