论文部分内容阅读
用单晶X射线衍射分析方法测得1,4-二苯氧基苯(Ⅰ)和1,4-双(4-甲氧基苯氧基)苯(Ⅱ)的晶体结构。它们的晶胞参数分别为:(Ⅰ)α=5.876(2),b=7.832(2),c=15.455(6),β=95.33(3)°;空间群为P2_1/c,Z=2。(Ⅱ)α=6.017(1),b=7.577(1),c=36.404(5);空间群为Pcab,Z=4.(Ⅰ),(Ⅱ)的分子构象、键长和键角数据表明氧桥两边的苯环的共轭极化效应不能贯通,而苯氧基只是分子中的一个独立片断。从而也阐明了此类聚苯醚体系的电子吸收光谱的同系直线斜率小的原因。
The crystal structures of 1,4-diphenoxybenzene (Ⅰ) and 1,4-bis (4-methoxyphenoxy) benzene (Ⅱ) were measured by single crystal X-ray diffraction analysis. Their unit cell parameters are: (Ⅰ) α = 5.876 (2), b = 7.832 (2), c = 15.455 (6), β = 95.33 . (Ⅱ) α = 6.017 (1), b = 7.577 (1), c = 36.404 (5); space group is Pcab, Z = 4. The molecular conformation, bond length and bond angle data It is shown that the conjugate polarization of the benzene rings on both sides of the oxygen bridge can not be penetrated, while the phenoxy group is only an independent fragment in the molecule. Thus, the reasons for the small slope of the homologous straight line of the electron absorption spectrum of such polyphenylene ether systems are also clarified.