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Supramolecular Copolymerization by Sequence Reorganization of a Supramolecular Homopolymer
Author(s) -
Nadamoto Kouhei,
Maruyama Kei,
Fujii Naoka,
Ikeda Toshiaki,
Kihara Shinichi,
Haino Takeharu
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201800980
Subject(s) - supramolecular chemistry , copolymer , polymer chemistry , macromolecule , supramolecular polymers , titration , sequence (biology) , chemistry , polymer , alkyl , crystallography , stoichiometry , viscometer , materials science , organic chemistry , crystal structure , viscosity , biochemistry , composite material
The homopolymeric sequence formed by the head‐to‐head association of tetrakisporphyrin 1 is completely dissociated by the competitive association of the ditopic guest G2 , resulting in the supramolecular copolymer poly‐ 1 ⋅ G2 with an alternatingly repeating host–guest sequence. The 1:1 stoichiometry of 1 and G2 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.