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Cationic polymerization of dibenzofulvene leading to a pi-stacked polymer

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Title: Cationic polymerization of dibenzofulvene leading to a pi-stacked polymer
Authors: Nageh, Hassan Browse this author
Wang, Yue Browse this author
Nakano, Tamaki Browse this author →KAKEN DB
Keywords: Conformation
Counter ion
Excimer emission
Issue Date: 23-May-2018
Publisher: Elsevier
Journal Title: Polymer
Volume: 144
Start Page: 51
End Page: 56
Publisher DOI: 10.1016/j.polymer.2018.04.042
Abstract: Cationic polymerization of dibenzofulvene is conducted using BF3-OEt2, CH3SO3H, CF3CO2H, and CH3CO2H as catalyst or initiator in CH2Cl2 under various conditions. The cationic polymerization leads to controlled stereochemistry and results in a pi-stacked polymer through the polymerization. The polymers synthesized using BF3-OEt2 and CH3SO3H appear to possess different pi-stacked structures. The polymer made using CH3SO3H has an all-trans main-chain C-C bond conformation while the one prepared using BF3-OEt2 may at least partially have a trans-gauche main-chain C-C bond conformation. pi-Stacked conformations are confirmed on the basis of remarkable anisotropy effects on aromatic signals in H-1 NMR spectra, hypochromic effects in electronic absorbance spectra, and dimer (excimer) emission in fluorescence spectra. pi-Stacked conformation is found even for oligomer samples with M-n of as low as about 700, indicating that the conformation created by the cationic polymerization is rather stable. (C) 2018 Elsevier Ltd. All rights reserved.
Rights: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中野 環

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