Unravelling the crystal and molecular structure of a 1,3-linked aromatic poly(ether-ketone)

Unravelling the crystal and molecular structure of a 1,3-linked aromatic poly(ether-ketone)
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揭示1,3-连接芳香族聚醚酮的晶体和分子结构

DOI:
10.1016/j.mtchem.2022.100853
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发表时间:
2022
影响因子:
7.3
通讯作者:
Aldred P
Aldred P
中科院分区:
化学2区
文献类型:
--
作者:
Aldred P

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由F(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)F与Ho(1,4-Ar)Co(1,3-Ar)Co(1,4-Ar)OH进行亲核缩聚得到的芳香族聚醚酮[-O(1,4-Ar)Co(1,3-Ar)CO(1,4-Ar)-]n(Ar=1,4-Ar)的高取向纤维,经退火后得到了分辨率很好的X-射线纤维。新的衍射数据被用来检验两种不同的已发表的关于该聚合物的晶体和分子结构的模型,这两种模型都是基于三环晶体重复的,并且通过衍射模拟表明,这些结构都与新的纤维数据都不兼容。相反,我们报告了一种新的结构,基于六环晶体重复,给出了模拟的纤维衍射图案,与实验图案非常一致。新结构的晶体数据为:正交晶系,空间群Pcam,a=77.67,b=66.13,c=929.72,每个晶胞有两条链,V=11397;3ρ=11.43。不同寻常的是,单胞中的两个链通过a-Glide相关,这意味着两个链中的羰基是反平行排列的,而不是由于ab-Glide的存在而具有更常见的平行排列。新结构被证明与以前发表的X射线粉末和电子衍射数据完全兼容。
Highly-oriented fibres of the aromatic polyetherketone [-O(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)-]n(Ar = phenylene) obtained by nucleophilic polycondensation of F(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)F with HO(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)OH afford, after annealing, very well-resolved X-ray fibre patterns. The new diffraction data are used to test two different published models for the crystal and molecular structure of this polymer, both based on a three-ring crystallographic repeat, and it is shown by diffraction-modelling that neither of these structures is compatible with the new fibre-data. In contrast, we report a novel structure, based on a six-ring crystallographic repeat, that gives a simulated fibre-diffraction pattern in very good agreement with the experimental pattern. Crystal data for the new structure are: orthorhombic, space groupPcam,a= 7.67,b= 6.13, c = 29.72 Å, two chains per cell,V= 1397 Å3ρ= 1.43. Unusually, the two chains in the unit cell are related by ana-glide, meaning that the carbonyl groups in the two chains are alignedanti-parallel rather than having the more generally found parallel arrangement resulting from the presence of ab-glide. The new structure is shown to be fully compatible with previously published X-ray powder and electron diffraction data.
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