학술논문
Synthesis and mesomorphic properties of four-ring fluorinated liquid crystals with trifluoromethyl group.
Document Type
Article
Author
Source
Subject
*TRIFLUOROMETHYL compounds
*FLUORINATION
*MESOPHASES
*CHEMICAL synthesis
*INTERMEDIATES (Chemistry)
*CHEMICAL sample preparation
*
*
*
*
*
Language
ISSN
0267-8292
Abstract
The discovery of nematic phase in 3-fluoro-4-trifluoromethyl-4ʹ-(4ʹ-alkyl [trans,trans-1,1ʹ-bicyclohexyl]-4-yl) 1,1ʹ-biphenyls (n = 2, 3, 4, 5) is an accidental affair. A convenient method was used for the synthesis of these target compounds. After the preparation of the intermediate with trifluomethyl group, the target compounds were synthesised by Suzuki cross-coupling reaction. Then, these phase transition temperatures were measured by polarising textural observation, which confirmed the existence of single nematic phase. These temperatures were also measured by differential scanning calorimetry, which showed that the clearing point of compound (n = 3) is 267℃. The possible mechanism of occurrence of unique nematic phase was discussed on the basis of the principles of fluorine chemistry. [ABSTRACT FROM PUBLISHER]