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Ohtani S, Akine S, Kato K, Fa S, Shi TH, Ogoshi T. Silapillar[ n]arenes: Their Enhanced Electronic Conjugation and Conformational Versatility. J Am Chem Soc 2024; 146:4695-4703. [PMID: 38324921 DOI: 10.1021/jacs.3c12093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
During recent decades, methylene-bridged macrocyclic arenes have been widely used in supramolecular chemistry. However, their π-conjugations are very weak, as the methylene bridges disrupt the electronic communication between π orbitals of the aromatic units. Herein, we successfully synthesized a series of silapillar[n]arenes (n = 4, 6, and 8) using silylene bridging. These showed enhanced electronic conjugation compared with the parent pillar[n]arenes because of σ*-π* conjugation between σ* (Si-C) orbitals and π* orbitals of the benzenes. Owing to the longer Si-C bond compared with the C-C bond, silylene-bridging provides additional structural flexibility into the pillar[n]arene scaffolds; a strained silapillar[4]arene was formed, which is unavailable in the parent pillar[n]arenes because of the steric requirements. Furthermore, silapillar[n]arenes displayed interesting size-dependent structural and optical properties.
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Affiliation(s)
- Shunsuke Ohtani
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Shigehisa Akine
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
- WPI Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Kenichi Kato
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Shixin Fa
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tan-Hao Shi
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomoki Ogoshi
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
- WPI Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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Lu P, Lam JWY, Liu J, Jim CKW, Yuan W, Chan CYK, Xie N, Hu Q, Cheuk KKL, Tang BZ. Regioselective Alkyne Polyhydrosilylation: Synthesis and Photonic Properties of Poly(silylenevinylene)s. Macromolecules 2011. [DOI: 10.1021/ma201203w] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Ping Lu
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
| | - Jacky W. Y. Lam
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Jianzhao Liu
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Cathy K. W. Jim
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Wangzhang Yuan
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Carrie Y. K. Chan
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ni Xie
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Qin Hu
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Kevin K. L. Cheuk
- The Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China
| | - Ben Zhong Tang
- Fok Ying Tung Research Institute, The Hong Kong University of Science & Technology, Nansha, Guangzhou, China
- Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
- Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract
A summary of recent advances on the chemistry and photophysics of silylene-spaced divinylarene copolymers is presented. The silicon moieties have been shown to serve as an insulating spacer in these copolymers. The photophysical studies have provided useful insights into how chromophores in polymers interact intramolecularly. Because different chromophores can be regioregularly introduced into the polymeric chain, these copolymers have been extensively used as models for studying energy transfer, light harvesting as well as chiroptical transfer.
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Affiliation(s)
- Tien-Yau Luh
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106
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Cheng YJ, Luh TY. Synthesis, Light-Harvesting and Energy-Transfer Properties of Regioregular Silylene-Spaced Alternating [(Donor-SiMe2-)n=1-3-(Acceptor-SiMe2)] Copolymers. Chemistry 2004; 10:5361-8. [PMID: 15378727 DOI: 10.1002/chem.200400472] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A series of silylene-spaced alternating [(donor-SiMe2)(n=1-3)-(acceptor-SiMe2)] copolymers 4-6 was synthesized by rhodium-catalyzed hydrosilylation of bisalkynes with bissilyl hydrides. Monomeric reference compounds 7-10 with similar chromophore components were prepared for comparison. The ratio of donor to acceptor groups is well-controlled by the precise regiochemistry and nature of the repeat units. The silylene moieties serve as insulating spacers between chromophores. The polymers exhibit light-harvesting abilities, for which the intensity of the emission enhanced with larger donor-to-acceptor ratios. No emission originating from the donors was observed in fluorescence spectra, illustrating that intrachain energy transfer is highly efficient along the polymer chain.
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Affiliation(s)
- Yen-Ju Cheng
- Department of Chemistry and Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan
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