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Bundle Assemblies Formation of Alternating Copolymer: Alternating Copolymerization of Symmetrical Substituted p-Quinodimethanes with Asymmetrical N,7,7-Tricyanoquinone Methide Imine in Solid State
European Polymer Journal ( IF 5.8 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.eurpolymj.2020.109535
Takahito Itoh , Motoki Yamamura , Takaya Fukushima , Yuta Washio , Takahiro Uno , Masataka Kubo , Norimitsu Tohnai , Mikiji Miyata

Abstract Symmetrical 7,7,8,8-tetrakis(alkoxycarbonyl)-p-quinodimethanes with methoxy(1a(Me)) and ethoxy(1b(Et)) as alkoxy groups formed 1:1 charge-transfer complex crystals with an asymmetrical quinoid compound, N,7,7-tricyanoquinone methide imine (2). The 1:1 formation of the crystals was ascertained on the basis of 1H NMR spectroscopy and single crystal X-ray structure analysis. These 1:1 charge-transfer complex crystals (1a(Me)/2 and 1b(Et)/2 monomer cocrystals) underwent photochemical and thermal polymerizations via a radical mechanism with keeping initial crystal shapes in appearance to form stereoregular alternating copolymers in quantitative yields. The stereoregular alternating copolymers formed bundle assemblies in the less order state. The formation of stereoregular alternating copolymers was explained on the basis of the structures of the monomer cocrystals solved by X-ray crystallography. Less-ordered bundle assemblies are considered to be formed by findings that the gravity of each component is not aligned on a straight line within the one-dimensional column with alternating stacked arrangements of 1a(Me) or 1b(Et) and 2 in the crystals, which are caused by asymmetrical 2.

中文翻译:

交替共聚物的成束组装:对称取代的对醌二甲烷与不对称 N,7,7-三氰基醌甲基亚胺在固态中的交替共聚

摘要 具有甲氧基(1a(Me))和乙氧基(1b(Et))作为烷氧基的对称7,7,8,8-四(烷氧基羰基)-对醌二甲烷形成具有不对称醌型的1:1电荷转移络合物晶体化合物,N,7,7-三氰基醌甲基亚胺 (2)。基于 1 H NMR 光谱和单晶 X 射线结构分析确定了晶体的 1:1 形成。这些 1:1 电荷转移复合晶体(1a(Me)/2 和 1b(Et)/2 单体共晶)通过自由基机制进行光化学和热聚合,保持初始晶体形状的外观,以定量产率形成有规立构交替共聚物. 有规立构交替共聚物以低序状态形成束组件。基于X射线晶体学解析的单体共晶结构解释了有规立构交替共聚物的形成。低序束组件被认为是通过发现每个组件的重力未在一维柱内排列在一条直线上而形成的,其中 1a(Me) 或 1b(Et) 和 2 在晶体中交替堆叠排列,这是由不对称引起的 2。
更新日期:2020-02-01
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