Synthesis of a fully unsaturated all-carbon ladder polymer
Synthesis of a fully unsaturated all-carbon ladder polymer
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完全不饱和全碳梯形聚合物的合成
DOI：
10.1038/368831a0
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发表时间：
1994
期刊：
影响因子：
64.8
通讯作者：
V. Enkelmann
中科院分区：
文献类型：
--
作者：
A. Schlüter;M. Löffler;V. Enkelmann
一段时间以来，我们一直在努力合成结构完美、完全不饱和的双链(梯形)聚合物1；这种聚合物可能会将良好的电子性能与加工性结合起来。在这里，我们报道了通过Diels-Alder前体聚合物7(图4)成功地合成了完全不饱和的梯形聚合物1a(图1)。1a的结构非常类似于假设的二十面体C6O(参考文献2，3)分子1b(图1)的带区的开链聚合物类似物。聚合物1a尽管延长了π-共轭，但在氧气中是稳定的，因此可能对电致发光和光伏应用感兴趣4。由于La的生成所需的反应条件相对温和，而且它的双链结构，我们预计La沿着主干的p-分子轨道离域干扰比单链聚合物聚(苯基乙烯)少，后者是目前发光二极管中活性元素最感兴趣的材料5，6。
FOR some time we have been trying to synthesize structurally perfect, fully unsaturated, double-stranded (ladder) polymers1; such polymers might combine favourable electronic properties with processability. Here we report the successful synthesis of the fully unsaturated ladder polymer 1a (Fig. 1), by way of the Diels–Alder precursor polymer 7 (Fig. 4). The structure of 1a closely resembles the hypothetical open-chain, polymeric analogue of the belt-region of the icosahedral C6O (refs 2, 3) molecule, 1b (Fig. 1). Polymer 1a, despite its extended π-conjugation, is stable in oxygen and may therefore be of interest for electroluminescence and photovoltaics applications4. Owing to both the relatively mild reaction conditions required for its generation and its double-stranded structure, we expect la to have less interruptions of the p -molecular orbital delocalization along the backbone as compared with the single-stranded polymer poly(phenv lene vinylene), which is presently the material of prime interest for the active elements in light-emitting diodes5,6.