摘要
合成了１６种１，３－双－（介晶基）－１，１，３．３－四甲基二硅氧烷（Ⅱ_（ａ，ｂ），Ⅲ_（ａ─ｇ），Ⅲ_ｊ，Ⅳ_（ａ─ｆ）．其化学结构用￣１ＮＭＲ、ＩＲ、ＵＶ和元素分析表征。通过ＤＳＣ和偏光显微镜研究了它们的相行为，除Ⅱ_（ａ，ｂ）、Ⅲ_ｄ和Ⅳ_ｄ外，其余都呈现液晶相变。用Ｘ衍射分析研究了１，３－双－（４－甲基偶氮苯氧甲基）－１，１，３，３－四甲基二硅氧烷（Ⅱ_ａ）的晶体结构。讨论了这些新型硅氧烷化合物的比学结构对液晶相变行为的影响。
Sixteen 1, 3-bis-(mesogens )-1 , 1, 3, 3-tetramethyl disiloxanes ( Ia,b Ⅲa-g, Ⅲj,IV a-f) were synthesized. Their chemical structures were confirmed by 1H NMR , IR , UV and elemental analysis. Their phase behaviors were also investigated by using differential scanning calorimeter(DSC) and polarizing microscope. The results show that twelve compounds exhibit the liquid crystalline (LC) plase transition temperatures except four cornpunds(Ⅱa.b,Ⅲ d, IVd). X-ray diffraction has been used to investigate the crystal structure of 1, 3-bis-(4methylazobenzene-oxy-methyl)-1, 1, 3, 3-tetrametbyl disiloxane (Ⅱa). The influence ofchemical structures of these novel siloxane compounds on LC phase behaviors were discussed.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第3期471-476,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
液晶
硅氧烷
合成
偶氮苯
相变
Liquid crystalline, Siloxane, Synthesis. Phase behavior, Azobenzene
