Citation: Yan Li, Ming-Guang Li, Ya-Jun Su, Jian-Gang Liu, Yan-Chun Han, Shi-Jun Zheng, Li-Xiang Wang. Liquid crystal character controlled by complementary discotic molecules mixtures:Columnar stacking type and mesophase temperature range[J]. Chinese Chemical Letters, ;2016, 27(03): 475-480. doi: 10.1016/j.cclet.2015.12.024 shu

Liquid crystal character controlled by complementary discotic molecules mixtures:Columnar stacking type and mesophase temperature range

Yan Li ^a,c ,
Ming-Guang Li ^a,b ,
Ya-Jun Su ^a,b ,
Jian-Gang Liu ^a,b ,
Yan-Chun Han ^a,b,, ,
Shi-Jun Zheng ^c ,
Li-Xiang Wang ^a,b

a.
a. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
b.
b. University of the Chinese Academy of Sciences, Beijing 100049, China;
c.
c. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China

Corresponding author: Yan-Chun Han,
Received Date: 12 August 2015
Available Online: 30 September 2015
Fund Project: This work was supported by the National Natural Science Foundation of China (No.51303177) (No.51303177)the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDB12020300). (No.XDB12020300)

In this work, the mesophase properties were tuned via mixing two discotic molecules with structural complementarity. Compared with the liquid crystalline hexakis(n-hexyloxy)triphenylene (H6TP) materials (columnar hexagonal phase from 53℃ to 91℃), mesophase types as well as phase transition temperatures varied with the introduction of crystalline hexaazatriphenylene derivative (PBH) molecules. The introduction of less than 33% amount of PBH disrupted the columnar hexagonal phase formed by H6TP remarkably, followed by the decreased clearing temperatures of liquid crystals. As the PBH amount was further increased, the destroyed columnar hexagonal phase was turned into the columnar rectangular phase, in which H6TP and PBH molecules together formed the columnar mesophase. The formation of newmesophase contributed to the enlarged mesophase temperature (from 44℃ to 144℃). We speculated that the alkyl chains interaction induced by the PBH component competed with the strong π-π stacking between H6TP molecules, thus altering the liquid crystalline properties including mesophase types and phase transition temperatures.
- Alkyl chains packing,
- Mesophase type,
- Liquid crystals,
- Phase transitions,
- Mixture
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