An Intercalate Molecular Complex of Syndiotactic Polystyrene
An Intercalate Molecular Complex of Syndiotactic Polystyrene
复制标题
间规聚苯乙烯插层分子配合物
DOI：
10.1021/ma051075w
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发表时间：
2005
期刊：
影响因子：
5.5
通讯作者：
G. Guerra
中科院分区：
文献类型：
--
作者：
V. Petraccone;Oreste Tarallo;V. Venditto;G. Guerra
本文报道了间规聚苯乙烯(S-PS)与双环[2.2.1]七-2，5-二烯(降冰片二烯，Nb)的分子络合物的晶体结构。与已报道的S-PS分子络合物类似，该结构呈现单斜晶胞(晶胞常数a=17.5A，b=14.5A，c=7.8A，γ=107.8°)，其中S(2/1)2聚合物螺旋和客体分子按P21/a空间群堆积，而S-PS/Nb络合物的结构呈现连续客体分子层与对构型聚合物螺旋层交替，因此可描述为插层相。另一方面，所有已知的其他S-PS分子络合物的结构都将孤立的分子(或几个小分子)呈现在典型的纳米孔S-PSδ形式的空穴中，因此可以描述为笼状相。S-PS/Nb插层相的单体与客体的摩尔比为2：1，而S-PS杂化相的单体与客体的摩尔比一般为4/1。
The crystal structure of the molecular complex of syndiotactic polystyrene (s-PS) with bicyclo[2.2.1]hepta-2,5-diene (norbornadiene, NB) is presented. In analogy to the already described s-PS molecular complexes, this structure presents a monoclinic unit cell (cell constants a = 17.5 A, b = 14.5 A, c = 7.8 A, and γ = 107.8°) in which the s(2/1)2 polymer helices and guest molecules are packed according to the space group P21/a. However, the structure of the s-PS/NB complex presents layers of contiguous guest molecules alternated with layers of enantiomorphous polymer helices and hence can be described as an intercalate phase. On the other hand, all the known structures of other s-PS molecular complexes present isolated molecules (or a couple of small molecules) into the cavities typical of the nanoporous s-PS δ form and hence can be described as clathrate phases. The molar ratio between the monomeric unit and the guest is 2/1 for the s-PS/NB intercalate phase, while it is generally 4/1 for the s-PS clathra...