Molecular confirmation and crystal structure of the β form of poly(ethylene oxybenzoate)
Molecular confirmation and crystal structure of the β form of poly(ethylene oxybenzoate)
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DOI：
10.1002/pol.1978.180161109
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发表时间：
1978-11
期刊：
影响因子：
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通讯作者：
Yasuhiro Takahashi;T. Kurumizawa;H. Kusanagi;H. Tadokoro
中科院分区：
文献类型：
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作者：
Yasuhiro Takahashi;T. Kurumizawa;H. Kusanagi;H. Tadokoro
用X射线衍射分析了β型聚氧乙烯苯甲酸酯的晶体结构。四条近似伸展的分子链穿过一个晶胞，晶胞参数a = 8.19 A，B = 11.07 A，c（纤维轴）= 19.05 A，β = 114.8°，空间群为P21/n-C。α和β形式之间的结构差异主要是由于虚键和CH 2CH 2键的内旋转角。它们在β形式中基本上是反式构象，而α形式包含顺式和左式（CH 2CH 2）构象。
The crystal structure of the β form of poly(ethylene oxybenzoate) was analyzed by x-ray diffraction. Four nearly extended molecular chains pass through a unit cell with parameters a = 8.19 A, b = 11.07 A, c (fiber axis) = 19.05 A, β = 114.8°, and the space group P21/n-C. The structural difference between the α and β forms is mainly due to the internal rotation angles for the virtual bond and the CH2CH2 bond. They are essentially in trans confirmation in the β form, while the α form contains cis and gauche (CH2CH2) conformations.