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Macrocyclic poly(p-phenylenevinylene)s by ring expansion metathesis polymerisation and their characterisation by single-molecule spectroscopy†
Chemical Science ( IF 8.4 ) Pub Date : 2018-02-13 00:00:00 , DOI: 10.1039/c7sc03945j
Benjamin John Lidster 1, 2, 3, 4 , Shuzo Hirata 5, 6, 7, 8 , Shoki Matsuda 5, 6, 7, 8 , Takuya Yamamoto 8, 9, 10, 11, 12 , Venukrishnan Komanduri 1, 2, 3, 4 , Dharam Raj Kumar 1, 2, 3, 4 , Yasuyuki Tezuka 5, 6, 7, 8 , Martin Vacha 5, 6, 7, 8 , Michael L. Turner 1, 2, 3, 4
Affiliation  

Ring expansion metathesis polymerisation (REMP) has proven to be a viable approach to prepare high purity cyclic polymers. Macrocyclic polymers with a fully conjugated defect free backbone are of particular interest as these polymers have no end groups that can act as charge traps. In this work soluble macrocyclic poly(p-phenylenevinylene)s (cPPVs) have been prepared directly via the REMP of substituted paracyclophanedienes. Single-molecule spectroscopy of the two topological forms of PPV i.e., linear (lPPV) and cyclic (cPPV) revealed that lPPV exists in an extended conformation whereas the cPPV adopts a restricted ring-like conformation. Despite such large differences in the chain conformation, the spectral properties of the two compounds are unexpectedly very similar, and are dominated by torsional deformations in relatively short conjugated segments.

中文翻译:

大环聚对苯撑乙烯通过扩环复分解聚合及其单分子光谱表征

环扩复分解聚合(REMP)已被证明是制备高纯度环状聚合物的可行方法。具有完全共轭的无缺陷主链的大环聚合物特别受关注,因为这些聚合物没有可充当电荷陷阱的端基。在这项工作中,可溶的大环聚(对苯撑亚乙烯基)(c PPV)是通过取代的对环二烯二烯的REMP直接制备的。PPV的两种拓扑形式的单分子光谱,线性(l PPV)和环状(c PPV)显示,l PPV以扩展构象存在,而c PPV以扩展构象存在。PPV采用受限的环状构象。尽管在链构象上有如此大的差异,但是这两种化合物的光谱性质出乎意料地非常相似,并且在相对较短的共轭链段中受到扭转变形的支配。
更新日期:2018-02-13
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