title: Construction of Covalent Organic Nanotubes by Light-Induced Cross-Linking of Diacetylene-Based Helical Polymers.
abstract: Organic nanotubes (ONTs) are tubular nanostructures composed of small molecules or macromolecules that have found various applications including ion sensor/channels, gas absorption, and photovoltaics. While most ONTs are constructed by self-assembly processes based on weak noncovalent interactions, this unique property gives rise to the inherent instability of their tubular structures. Herein, we report a simple "helix-to-tube" strategy to construct robust, covalent ONTs from easily accessible poly(m-phenylene diethynylene)s (poly-PDEs) possessing chiral amide side chains that can adopt a helical conformation through hydrogen-bonding interactions. The helically folded poly-PDEs subsequently undergo light-induced cross-linking at longitudinally aligned 1,3-butadiyne moieties across the whole helix to form covalent tubes (ONTs) both in solution and solid phases. The structures of poly-PDEs and covalent ONTs were characterized by spectroscopic analyses, diffraction analysis, and microscopic analyses. We envisage that this simple yet powerful "helix-to-tube" strategy will generate a range of ONT-based materials by introducing functional moieties into a monomer.
authors.affiliation: Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8602, Japan.
authors.forename: Kaho
authors.initials: K
authors.lastname: Maeda
authors.affiliation: Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8602, Japan.|JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University , Chikusa, Nagoya 464-8602, Japan.
authors.forename: Liu
authors.initials: L
authors.lastname: Hong
authors.affiliation: Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8602, Japan.|JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University , Chikusa, Nagoya 464-8602, Japan.
authors.forename: Taishi
authors.initials: T
authors.lastname: Nishihara
authors.affiliation: Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8602, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakanishi
authors.affiliation: Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8602, Japan.|JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University , Chikusa, Nagoya 464-8602, Japan.|Institute of Advanced Energy, Kyoto University , Uji, Kyoto 611-0011, Japan.
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Miyauchi
authors.affiliation: Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8602, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Kitaura
authors.affiliation: Graduate School of Engineering, Nagoya University , Chikusa, Nagoya 464-8601, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Ousaka
authors.affiliation: Graduate School of Engineering, Nagoya University , Chikusa, Nagoya 464-8601, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Yashima
authors.affiliation: Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8602, Japan.
authors.forename: Hideto
authors.initials: H
authors.lastname: Ito
authors.affiliation: Graduate School of Science, Nagoya University , Chikusa, Nagoya 464-8602, Japan.|JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University , Chikusa, Nagoya 464-8602, Japan.|Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University , Chikusa, Nagoya 464-8602, Japan.
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Itami