Studies on Liquid Crystalline of Carbosilane Dendrimer of the Second Generation Containing Thirty-six 4-Nitroazobenzene Mesogenic Groups in Its Periphery

Abstract

Abstract: Liquid crystalline of a new carbosilane dendrimer of the second generation(D2) containing thirty-six 4-nitroazobenzene groups in its periphery was characterized by means of polarizing optical micrograph, DSC and WAXD. Mesogenic compound M5 exhibits threaded, schlieren and inversion lines texture of the nematic phase on the cooling from isotropic phase to solidified temperature. Dendrimer D2 shows the focal conic fan-shaped texture of the smectic A phase on the heating course from 69 to 187 ℃ and on the cooling course from 183 to 64 ℃. After cooling, the smectic E(S_E) phase with a texture of the focal conic fan-shape with stripes and concentric arcs appears from smectic A(S_A) phase. Phase behavior of dendrimer D2 in liquid crystalline state was K69S_A187I182S_A57S_E47K. The isotropic-smectic A transition enthalpy, smectic A-smectic E transition enthalpy and isotropic-smectic A transition entropy were 1.8, 4.5 and 4.0 J/(K·mol), respectively, and were in agreement with or close to those of small molecular liquid crystal.

Key words: Dendrimer, Smectic E and A liquid crystal, Nitroazobenzene, Carbosilane

CLC Number:

O631

TrendMD:

ZHANG Qi-Zhen, SHENG Xin, YIN Xiao-Ying, LI Guang, JI Yi-Ping . Studies on Liquid Crystalline of Carbosilane Dendrimer of the Second Generation Containing Thirty-six 4-Nitroazobenzene Mesogenic Groups in Its Periphery[J]. Chem. J. Chinese Universities, 2004, 25(5): 988.

[1]	LI Cuiqin, ZHAI Xue, SUN Peng, GAO Yuxin, ZHANG Zhiqiu, WANG Jun, LI Feng. Synthesis and Antioxidant Capacity of Dendrimer Bridged Antioxidant with Semi-hindered Phenolic Groups^† [J]. Chem. J. Chinese Universities, 2019, 40(7): 1535.
[2]	ZHU Qinfu,HU Kezhen,LI Xiaojie,CHEN Mingqing. Preparation of Dendrimer-gold Nanoparticle Composites for pH Responsive Drug Delivery^† [J]. Chem. J. Chinese Universities, 2019, 40(5): 1065.
[3]	XIAO Ye, WANG Yang, ZHOU Wei, PENG Xiaohong. Preparation of Ru/Rh Bimetallic Nanoparticles Stabilized by Heterocyclic Poly(propylene imine) Dendrimer and Their Application for Catalytic Hydrogenation of Nitrile-Butadiene Rubber^† [J]. Chem. J. Chinese Universities, 2016, 37(4): 786.
[4]	CHENG Yong, LI Xiaohu, LIU Weihua, WU Guozhong, WANG Mouhua. Decay of Free Radicals in Polycarbosilane Induced by γ-Rays Irradiation [J]. Chem. J. Chinese Universities, 2016, 37(3): 595.
[5]	WANG Jun, HUO Hongliang, LI Cuiqin, MA Lili, SHI Weiguang, CHEN Shuai. Synthesis of Novel Dendritic Bridging Nickel Complex for Oligomerization of Olefins^† [J]. Chem. J. Chinese Universities, 2015, 36(9): 1813.
[6]	ZHANG Fada, LIU Yi, XU Jingcheng, LI Shengjuan, WANG Xiunan, SUN Yue, ZHAO Xinluo. Molecular Dynamics Study on Binding Strength and Conformation of Dendrimer-based Drug Delivery Systems^† [J]. Chem. J. Chinese Universities, 2015, 36(6): 1156.
[7]	YUAN Qin, SONG Yongcai, WANG Guodong. Adjusting the Oxygen Content of the Cured Polyaluminocarbosilane Fibers^† [J]. Chem. J. Chinese Universities, 2015, 36(6): 1213.
[8]	LI Yongqiang, SONG Yongcai. Synthesis and Spinnability of the High Softening-point Polycarbosilane^† [J]. Chem. J. Chinese Universities, 2014, 35(10): 2272.
[9]	YANG Hua, QI Qi, WANG Bin-Bin, QIAN Ying. Aggregation-induced Emission Enhance and Electrical Storage Properties of 1,2,4,5-Tetra{4-[N,N-di(4-iodophenyl)amino]styryl}benzene [J]. Chem. J. Chinese Universities, 2013, 34(8): 1880.
[10]	ZHU Yi-Hua, WANG Hao, SHAO Chang-Wei. Synthesis and Characterization of SiC Ceramic Precursor with High Boron Content [J]. Chem. J. Chinese Universities, 2013, 34(10): 2415.
[11]	HAN Qiao-Rong, LU Tian-Hong, JIANG Yu-Liang, WANG Bing-Xiang. Effects of Cu²⁺ on Fluorescent Properties of Biphenyl-4-carbaldehyde Modified Polyamidoamine Dendrimers [J]. Chem. J. Chinese Universities, 2012, 33(09): 1991.
[12]	GU Yin-Jun, WANG Xiu-Ling, ZHAO Qin, CHEN Gong, LIU Yong-Jian, ZHANG Li-Jie. Preparation and Characterization of Bifunctional Fluorescent Magnetic Dendrimer Microspheres [J]. Chem. J. Chinese Universities, 2012, 33(05): 885.
[13]	HU Bin, OUYANG Mi, ZHANG Yu-Jian, XIANG Wen-Qin, ZHANG Cheng. Synthesis and Optical Properties of 3D Compounds with Core and D-π-A Dipolar Group [J]. Chem. J. Chinese Universities, 2012, 33(01): 82.
[14]	GUO Ling-Xiang, GAO Qiu-Duan. Synthesis and Performance of PAMAM-Lys Dendrimer [J]. Chem. J. Chinese Universities, 2012, 33(01): 176.
[15]	LIN Bin-Bin*, CHEN Han, QIU Yong-Qing, SU Zhong-Min. Density Functional Theory of Second-order Nonlinear Optical Properties of a Series of Organic Dendrimer Molecules with an Imidazole Chromophore [J]. Chem. J. Chinese Universities, 2011, 32(7): 1581.

Studies on Liquid Crystalline of Carbosilane Dendrimer of the Second Generation Containing Thirty-six 4-Nitroazobenzene Mesogenic Groups in Its Periphery

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments