Macrocyclic poly(p-phenylenevinylene)s by ring expansion metathesis polymerisation and their characterisation by single-molecule spectroscopy

作者：Lidster Benjamin John; Hirata Shuzo; Matsuda Shoki; Yamamoto Takuya; Komanduri Venukrishnan; Kumar Dharam Raj; Tezuka Yasuyuki; Vacha Martin^*; Turner Michael L^*

来源：Chemical Science, 2018, 9(11): 2934-2941.

DOI：10.1039/c7sc03945j

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.

• 出版日期2018-3-21