Supramolecular Copolymerization by Sequence Reorganization of a Supramolecular Homopolymer. (24th May 2018)

• Record Type: Journal Article
• Authors: Nadamoto, Kouhei; Maruyama, Kei; Fujii, Naoka; Ikeda, Toshiaki; Kihara, Shin‐ichi; Haino, Takeharu
• Is Part Of: Angewandte Chemie. Volume 130:Number 24(2018)
• Page Start: 7146
• Page End: 7151
• Publication Date: 2018-05-24
• Subjects: Molekulare Erkennung -- Porphyrine -- Sequenzkontrollierte Copolymere -- Supramolekulare Polymere -- Wirt-Gast-Komplexe; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201800980
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: The homopolymeric sequence formed by the head‐to‐head association of tetrakisporphyrin1 is completely dissociated by the competitive association of the ditopic guestG2, resulting in the supramolecular copolymer poly‐1 ⋅G2 with an alternatingly repeating host–guest sequence. The 1:1 stoichiometry of1 andG2 is confirmed by a Job plot using UV/Vis titration and diffusion‐ordered NMR spectroscopy (DOSY). The solution viscometry for poly‐1 and poly‐1 ⋅G2 suggests that the supramolecular chain of poly‐1 behaves like a rod, whereas the supramolecular copolymer chain of poly‐1 ⋅G2 behaves like a swelled fat chain, which is entangled in the semi‐dilute regime. Atomic force microscopy shows that the supramolecular polymer poly‐1 ⋅G2 is highly oriented through the interdigitation of the long alkyl chains.