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A Comparative X-Ray Diffraction Study of Two Liquid Crystalline 2,5-Disubstituted 1,3,4-Oxadiazole and 1,3,4-Thiadiazole Derivatives in Their Smectic Phases

 

作者: VladimirF. Petrov,   Takeyasu Tasaka,   Hiroaki Okamoto,   Shunsuke Takenaka,   SofiaI. Torgova,   LudmilaA Karamysheva,   IrinaF. Agafonova,  

 

期刊: Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals  （Taylor Available online 2000）
卷期: Volume 348, issue 1  

页码: 73-78

 

ISSN:1058-725X

 

年代: 2000

 

DOI:10.1080/10587250008024797

 

出版商: Taylor & Francis Group

 

关键词: X-ray diffraction;smectic;1,3,4-oxadiazole;1,3,4-thiadiazole

 

数据来源: Taylor

 

摘要:

X-ray diffraction study of two liquid crystalline 2,5-disubstituted 1,3,4-oxadiazole and 1,3,4-thiadiazole derivatives reveals the existence of a partially bilayered smectic Ad phase in the terminally bromo substituted derivatives, with the lower level of molecular overlapping in the formation of the dimer and more pronounced smectic fluctuations on the dimeric density wave observed for the former compound.

 

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