Mesomorphic di- and tetra-fluorinated imines and their complexes with ReI
作者:Xiao-hua Liu、Ian Manners、Duncan W. Bruce
DOI:10.1039/a802167h
日期:——
The synthesis of some di- and tetra-fluoro imine mesogens is described and their mesomorphism is compared with that of the parent, unfluorinated materials. The comparison reveals that in the fluorinated compounds, more ordered smectic phases were suppressed and crystal phases were destabilised; nematic phases were uniformly destabilised. The imines were then reacted with [ReMe(CO)5 ] to give related orthometallated complexes which were also mesomorphic.
Alkyloxy azo-cinnamate ester based thermotropic liquid crystals and their photophysical investigations
作者:Chinnaiyan Selvarasu、Palaninathan Kannan
DOI:10.1080/15421406.2017.1301859
日期:2017.5.3
series of rod shaped Schiff base containing azo-cinnamate thermotropicliquidcrystalline compounds were synthesized and characterized. These molecules have four different alkyl spacers (n = 6, 8, 10, and 12) at one end and a dodecyloxy chain at another end (n = 12) which influence their liquidcrystalline properties. Liquidcrystallinity commence from six methylenespacer onwards in the series exhibiting
Phase Characterization and Study of Molecular Order of a Three-Ring Mesogen by <sup>13</sup>C NMR in Smectic C and Nematic Phases
作者:S. Kalaivani、T. Narasimhaswamy、Bibhuti B. Das、Nitin P. Lobo、K.V. Ramanathan
DOI:10.1021/jp203388v
日期:2011.10.13
noticed for lower homologues, while an additional smectic C phase was found for higher homologues. Solid-state high-resolution natural abundance 13C NMR studies of a typical mesogen in the solid phase and in the mesophases have been carried out. The 13C NMR spectrum of the mesogen in the smectic C and nematicphases indicated spontaneous alignment of the molecule in the magnetic field. By utilizing the
由于其对诸如温度,机械力以及电场和磁场之类的外部刺激的敏感性,表现出热致液晶性质的分子已经变得非常重要。结果,通过在芳族核附近以及在侧链中引入各种官能团,已经合成了几种新颖的介晶,并且已经研究了它们的性质。在本研究中,我们报告了在一个末端带有羟基的三环液晶元。这些介晶通过多步路线合成,并通过光谱技术完成结构表征。通过热阶段光学偏振显微镜,差示扫描量热法和小角X射线散射研究了中间相性质。较低的同系物发现了对映向列相,而较高的同系物则发现了另外的近晶C相。固态高分辨率自然丰度已经对固相和中间相中典型的液晶元进行了13 C NMR研究。层列碳相和向列相的液晶元的13 C NMR光谱表明该分子在磁场中自发排列。通过利用称为SAMPI4的二维分离局部场(SLF)NMR实验,获得了13 C– 1 H偶极耦合,这些耦合用于确定液晶元的取向顺序参数。
Liquid crystalline complexes of octahedral manganese(I)
作者:Duncan W. Bruce、Xiao-Hua Liu
DOI:10.1039/c39940000729
日期:——
Liquid crystalline metal complexes of MnI are reported which comprise an aromatic imine bound in an orthometallated fashion to a Mn(CO)4 moiety; these are unique examples of calamitic thermotropic liquid crystals containing a metal with a simple octahedral coordination environment.
Synthesis and mesomorphic properties of novel Schiff base liquid crystalline EDOT derivatives
作者:Ashwathanarayana Gowda、Arun Roy、Sandeep Kumar
DOI:10.1016/j.molliq.2016.11.010
日期:2017.1
Herein, we reported novel banana liquid crystals derived from ethylenedioxythiophene (EDOT) central unit encompass with Schiff base. Structural charecterization of these compounds was carried out from their spectral and elemental analysis. Physical properties of all the newly synthesized compounds were investigated by polarising optical microscopy, differential scanning calorimetry, thermogravimetric