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Wang C, Deng R, Weck M. Orthogonal Supramolecular Assemblies Using Side-Chain Functionalized Helical Poly(isocyanide)s. Macromolecules 2023; 56:3507-3516. [PMID: 37251603 PMCID: PMC10210603 DOI: 10.1021/acs.macromol.2c02224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 03/20/2023] [Indexed: 05/31/2023]
Abstract
Mimicking the structure of proteins using synthetic polymers requires building blocks with structural similarity and the use of various noncovalent and dynamic covalent interactions. We report the synthesis of helical poly(isocyanide)s bearing diaminopyridine and pyridine side-chains and the multistep functionalization of the polymers' side-chains using hydrogen bonding and metal coordination. The orthogonality of the hydrogen bonding and metal coordination was proved by varying the sequence of the multistep assembly. The two side-chain functionalizations are reversible through the use of competitive solvents and/or competing ligands. Throughout the assembly and disassembly, the helical conformation of the polymer backbone is sustained as proved by circular dichroism spectroscopy. These results open the possibility to incorporate helical domains into complex polymer architectures and create a helical scaffold for smart materials.
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2
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Kunitake M, Uemura S. Construction and Scanning Probe Microscopy Imaging of Two-dimensional Nanomaterials. CHEM LETT 2020. [DOI: 10.1246/cl.200080] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masashi Kunitake
- Faculty of Advanced Science & Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - Shinobu Uemura
- Faculty of Engineering and Design, Kagawa University, 2217-20 Hayashi-cho, Takamatsu, Kagawa 761-0396, Japan
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3
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Fernández B, Rodríguez R, Quiñoá E, Riguera R, Freire F. Decoding the ECD Spectra of Poly(phenylacetylene)s: Structural Significance. ACS OMEGA 2019; 4:5233-5240. [PMID: 31459695 PMCID: PMC6648364 DOI: 10.1021/acsomega.9b00122] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 02/08/2019] [Indexed: 06/10/2023]
Abstract
The role of the main dihedral angles in the electronic circular dichroism (ECD) spectra of poly(phenylacetylene)s (PPAs) was estimated by using time-dependent density functional theory (TD-DFT) for oligo(phenylacetylene)s (n = 12). These studies reveal that in cis-transoidal arrangements, the first Cotton effect is dominated by excitations involving molecular orbitals (MOs) mainly related to the polyene backbone. Hence, for this scaffold, the ± sign of the first Cotton effect reflects the P/M helical sense of the internal helix of the polymer. However, in cis-cisoidal arrangements, contribution of MOs in the polyene and the aryl rings of the PPA backbone produce the first Cotton effect band. As a result, two different ECD signatures with three or four alternating Cotton effects can be produced depending on the sign of the ω1 and ω3 dihedral angles which determine the helical sense of the polyene (ω1) and the relative orientation of the aryl ring toward the polyene (ω3), respectively. Thus, on the one hand, if ω1 and ω3 rotate in opposite directions, a CD with three alternating Cotton effects is observed, where the sign of first Cotton correlates with the P/M helical sense of the polyene. On the other hand, if ω1 and ω3 rotate in the same direction, a CD signature with four alternating Cotton effects is produced where the information relative to the P/M helical sense of the polyene is contained in the second Cotton effect.
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Affiliation(s)
- Berta Fernández
- Department
of Physical Chemistry, University of Santiago
de Compostela, 15782 Santiago de Compostela, Spain
| | - Rafael Rodríguez
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CiQUS) and Departamento de Química
Orgánica, Universidade de Santiago
de Compostela, 15782 Santiago de Compostela, Spain
| | - Emilio Quiñoá
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CiQUS) and Departamento de Química
Orgánica, Universidade de Santiago
de Compostela, 15782 Santiago de Compostela, Spain
| | - Ricardo Riguera
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CiQUS) and Departamento de Química
Orgánica, Universidade de Santiago
de Compostela, 15782 Santiago de Compostela, Spain
| | - Félix Freire
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CiQUS) and Departamento de Química
Orgánica, Universidade de Santiago
de Compostela, 15782 Santiago de Compostela, Spain
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4
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Ishiwari F, Shoji Y, Fukushima T. Supramolecular scaffolds enabling the controlled assembly of functional molecular units. Chem Sci 2018; 9:2028-2041. [PMID: 29719683 PMCID: PMC5896469 DOI: 10.1039/c7sc04340f] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 01/19/2018] [Indexed: 12/14/2022] Open
Abstract
To assemble functional molecular units into a desired structure while controlling positional and orientational order is a key technology for the development of high-performance organic materials that exhibit electronic, optoelectronic, biological and even dynamic functions. For this purpose, we cannot rely simply on the inherent self-assembly properties of the target functional molecular units, since it is difficult to predict, based solely on the molecular structure, what structure will be achieved upon assembly. To address this issue, it would be useful to employ molecular building blocks with self-assembly structures that can be clearly predicted and defined, to make target molecular units assemble into a desired structure. To date, various motifs of molecular assemblies, polymers, discrete and/or three-dimensional metal-organic complexes, nanoparticles and metal/metal oxide substrates have been developed to create materials with particular structures and dimensionalities. In this perspective, we define such assembly motifs as "supramolecular scaffolds". The structure of supramolecular scaffolds can be classified in terms of dimensionality, and they range in size from nano- to macroscopic scales. Functional molecular units, when attached to supramolecular scaffolds either covalently or non-covalently, can be assembled into specific structures, thus enabling the exploration of new properties, which cannot be achieved with the target molecular units alone. Through the classification and overview of reported examples, we shed new light on supramolecular scaffolds for the rational design of organic and polymeric materials.
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Affiliation(s)
- Fumitaka Ishiwari
- Laboratory for Chemistry and Life Science , Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan .
| | - Yoshiaki Shoji
- Laboratory for Chemistry and Life Science , Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan .
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science , Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan .
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5
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Freire F, Quiñoá E, Riguera R. Chiral nanostructure in polymers under different deposition conditions observed using atomic force microscopy of monolayers: poly(phenylacetylene)s as a case study. Chem Commun (Camb) 2017; 53:481-492. [PMID: 27827473 DOI: 10.1039/c6cc05598b] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Dynamic poly(phenylacetylene)s (PPAs) adopt helical structures with different elongation or helical senses depending on the types of pendants. Hence, a good knowledge of the parameters that define their structures becomes a key factor in the understanding of their properties and functions. Herein, the techniques used for the study of the secondary structure of PPAs using atomic-force microscopy (AFM) are presented, with special attention directed towards the methods used for the preparation of monolayers, and their consequences in the quality of the AFM images. Thus, monolayers formed by drop casting, spin coating followed by crystallization or annealing, Langmuir-Blodgett and Langmuir-Schaefer methods, onto highly oriented pyrolytic graphite (HOPG) or mica, are described, together with the AFM images and the resulting helical structure obtained for different PPAs. Furthermore, some conclusions are drawn both on the adequacy of the different techniques for the formation of monolayers and on the solid supports utilized to elucidate the secondary structure of different PPAs.
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Affiliation(s)
- F Freire
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - E Quiñoá
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - R Riguera
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
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6
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Affiliation(s)
- Félix Freire
- Department
of Organic Chemistry
and Center for Research in Biological Chemistry and Molecular Materials
(CIQUS), University of Santiago de Compostela, E-15782 Santiago
de Compostela, Spain
| | - Emilio Quiñoá
- Department
of Organic Chemistry
and Center for Research in Biological Chemistry and Molecular Materials
(CIQUS), University of Santiago de Compostela, E-15782 Santiago
de Compostela, Spain
| | - Ricardo Riguera
- Department
of Organic Chemistry
and Center for Research in Biological Chemistry and Molecular Materials
(CIQUS), University of Santiago de Compostela, E-15782 Santiago
de Compostela, Spain
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7
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Vicente J, Gil-Rubio J, Zhou G, Bolink HJ, Arias-Pardilla J. Synthesis and luminescence of poly(phenylacetylene)s with pendant iridium complexes and carbazole groups. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24159] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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8
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Iida H, Mizoguchi T, Oh SD, Yashima E. Redox-triggered switching of helical chirality of poly(phenylacetylene)s bearing riboflavin pendants. Polym Chem 2010. [DOI: 10.1039/c0py00044b] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yashima E, Maeda K, Iida H, Furusho Y, Nagai K. Helical Polymers: Synthesis, Structures, and Functions. Chem Rev 2009; 109:6102-211. [PMID: 19905011 DOI: 10.1021/cr900162q] [Citation(s) in RCA: 1261] [Impact Index Per Article: 84.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Eiji Yashima
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan, and Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Katsuhiro Maeda
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan, and Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Hiroki Iida
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan, and Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Yoshio Furusho
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan, and Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Kanji Nagai
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan, and Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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Zhi J, Guan Y, Cui J, Liu A, Zhu Z, Wan X, Zhou Q. Synthesis and characterization of optically active helical vinyl polymers via free radical polymerization. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23331] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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11
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Kumaki J, Sakurai SI, Yashima E. Visualization of synthetic helical polymers by high-resolution atomic force microscopy. Chem Soc Rev 2009; 38:737-46. [DOI: 10.1039/b718433f] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Kumaki J, Kawauchi T, Ute K, Kitayama T, Yashima E. Molecular Weight Recognition in the Multiple-Stranded Helix of a Synthetic Polymer without Specific Monomer–Monomer Interaction. J Am Chem Soc 2008; 130:6373-80. [DOI: 10.1021/ja077861t] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiro Kumaki
- Japan Science and Technology Agency (JST), Department of Chemical Science and Technology, Faculty and School of Engineering, The University of Tokushima, 2-1 Minami-josanjima, Tokushima 770-8506, Japan, Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Takehiro Kawauchi
- Japan Science and Technology Agency (JST), Department of Chemical Science and Technology, Faculty and School of Engineering, The University of Tokushima, 2-1 Minami-josanjima, Tokushima 770-8506, Japan, Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Koichi Ute
- Japan Science and Technology Agency (JST), Department of Chemical Science and Technology, Faculty and School of Engineering, The University of Tokushima, 2-1 Minami-josanjima, Tokushima 770-8506, Japan, Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Tatsuki Kitayama
- Japan Science and Technology Agency (JST), Department of Chemical Science and Technology, Faculty and School of Engineering, The University of Tokushima, 2-1 Minami-josanjima, Tokushima 770-8506, Japan, Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Eiji Yashima
- Japan Science and Technology Agency (JST), Department of Chemical Science and Technology, Faculty and School of Engineering, The University of Tokushima, 2-1 Minami-josanjima, Tokushima 770-8506, Japan, Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
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13
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Kumaki J, Kawauchi T, Yashima E. Peculiar ‘Reptational’ Movements of Single Synthetic Polymer Chains on Substrate Observed by AFM. Macromol Rapid Commun 2008. [DOI: 10.1002/marc.200700725] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Lin H, Morino K, Yashima E. Synthesis and chiroptical properties of a helical poly(phenylacetylene) bearing optically active pyrene pendants. Chirality 2008; 20:386-92. [PMID: 17724655 DOI: 10.1002/chir.20457] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A novel poly(phenylacetylene) derivative bearing optically active pyrene moieties as the pendant groups (poly-(R)-1) was prepared by the polymerization of the corresponding monomer (R)-1 in the presence of a rhodium catalyst, and its chiroptical property was investigated. Poly-(R)-1 exhibited an induced circular dichroism (ICD) in the polymer backbone region due to the predominantly one-handed helical conformation. The ICD pattern dramatically changed and was accompanied by inversion of the Cotton effect sign in response to a change in the temperature and solvent, indicating that poly-(R)-1 underwent a helix-helix transition in response to the external stimuli.
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Affiliation(s)
- Hongzhen Lin
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
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15
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Sakurai SI, Ohsawa S, Nagai K, Okoshi K, Kumaki J, Yashima E. Two-Dimensional Helix-Bundle Formation of a Dynamic Helical Poly(phenylacetylene) with Achiral Pendant Groups on Graphite. Angew Chem Int Ed Engl 2007; 46:7605-8. [PMID: 17763511 DOI: 10.1002/anie.200701546] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shin-ichiro Sakurai
- Yashima Super-structured Helix Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency, Nagoya 463-0003, Japan.
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Sakurai SI, Ohsawa S, Nagai K, Okoshi K, Kumaki J, Yashima E. Two-Dimensional Helix-Bundle Formation of a Dynamic Helical Poly(phenylacetylene) with Achiral Pendant Groups on Graphite. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200701546] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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17
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Sakurai SI, Okoshi K, Kumaki J, Yashima E. Two-dimensional hierarchical self-assembly of one-handed helical polymers on graphite. Angew Chem Int Ed Engl 2007; 45:1245-8. [PMID: 16411264 DOI: 10.1002/anie.200503136] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shin-Ichiro Sakurai
- Yashima Super-Structured Helix Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), 101 Creation Core Nagoya, Shimoshidami, Moriyama-ku, Nagoya 463-0003, Japan
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Gallyamov MO, Starodubtsev SG, Bragina TP, Dubrovina LV, Potemkin II, Marti O, Khokhlov AR. Conformational Behaviour of Comb-Like Poly(4-vinylpyridinium) Salts and their Complexes with Surfactants in Solution and on a Flat Surface. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200600450] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Gallyamov MO, Starodubtsev SG, Khokhlov AR. Synthesis and SFM Study of Comb-Like Poly(4-vinylpyridinium) Salts and Their Complexes with Surfactants. Macromol Rapid Commun 2006. [DOI: 10.1002/marc.200600175] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Sakurai SI, Okoshi K, Kumaki J, Yashima E. Two-Dimensional Hierarchical Self-Assembly of One-Handed Helical Polymers on Graphite. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200503136] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Kumaki J, Kawauchi T, Yashima E. “Reptational” Movements of Single Synthetic Polymer Chains on Substrate Observed by in-Situ Atomic Force Microscopy. Macromolecules 2006. [DOI: 10.1021/ma051933o] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiro Kumaki
- Yashima Super-structured Helix Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), 101 Creation Core Nagoya, Shimoshidami, Moriyama-ku, Nagoya 463-0003, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Takehiro Kawauchi
- Yashima Super-structured Helix Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), 101 Creation Core Nagoya, Shimoshidami, Moriyama-ku, Nagoya 463-0003, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Eiji Yashima
- Yashima Super-structured Helix Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), 101 Creation Core Nagoya, Shimoshidami, Moriyama-ku, Nagoya 463-0003, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
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22
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Onouchi H, Hasegawa T, Kashiwagi D, Ishiguro H, Maeda K, Yashima E. Chirality sensing of various biomolecules with helical poly(phenylacetylene)s bearing acidic functional groups in water. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21621] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hua J, Lam JWY, Li Z, Qin A, Sun J, Dong Y, Dong Y, Tang BZ. Synthesis of liquid crystalline poly(1-pentyne)s and fabrication of polyacetylene–perovskite hybrids. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21448] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ohira A, Kim SY, Fujiki M, Kawakami Y, Naito M, Kwak G, Saxena A. Switching in molecular shapes: main chain length driven rod–circle transition of isolated helical polysilanes. Chem Commun (Camb) 2006:2705-7. [PMID: 16786094 DOI: 10.1039/b603122f] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unique conformations such as rod, semicircle, and circle structures of isolated semi-flexible helical polysilanes were observed by atomic force microscopy (AFM); the chain topology was significantly related to the chain length (molecular weight) on the surfaces.
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Affiliation(s)
- Akihiro Ohira
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara 630-0101, Japan.
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25
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Vicente J, Gil-Rubio J, Barquero N. Synthesis, characterization, and metal complexes of polyacetylenes with pendant 2,2′-bipyridyl groups. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pola.20816] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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