Photosensitive phasmid-like liquid crystalline materials with unusual mesomorphic behavior
Photosensitive phasmid-like liquid crystalline materials with unusual mesomorphic behavior
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DOI：
10.1039/c0jm01858a
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发表时间：
2010-10
影响因子：
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通讯作者：
N. Nagaveni;Meenal Gupta;A. Roy;V. Prasad
中科院分区：
文献类型：
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作者：
N. Nagaveni;Meenal Gupta;A. Roy;V. Prasad
我们报道了五个新系列的偶氮功能化的类相化合物的合成和介晶性质。它们由对称和非对称分子组成。这些化合物中的大多数被发现是液晶，具有不寻常的行为。它们主要表现出柱状、近晶和层状中间相。除了这些相，在少数情况下，我们还观察到一些更高级的中间相。通过偏光显微镜（POM）、差示扫描量热法（DSC）和X射线衍射（XRD）研究这些中间相的性质。我们获得了非常规的XRD图谱中的一些化合物的α相。根据实验结果，我们提出了一个模型，在柱状相的分子排列是中心矩形。介电和光学传输测量的中间相的一个代表性的化合物也报道。我们对其中一种化合物的中间相光敏性作了定性研究。
We report on the synthesis and mesomorphic properties of five new series of azo functionalized phasmid-like compounds formed by covalent bonding. They consist of both symmetric and non-symmetric molecules. Most of these compounds are found to be liquid crystalline, with unusual behavior. They exhibit mainly nematic, columnar and smectic mesophases. In addition to these phases, in few cases, we observed some higher order mesophases as well. The nature of these mesophases is investigated by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) studies. We obtained unconventional XRD patterns for the nematic phase in some of these compounds. Based on the experimental results, we propose a model for the molecular arrangement in the columnar phase to be center rectangular. Dielectric and optical transmission measurements in the mesophases of one of the representative compounds are also reported. We have made a qualitative investigation into the photosensitivity of the mesophases of one of these compounds.