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Nojo W, Tamaoki H, Ishigaki Y, Katoono R, Fujiwara K, Fukushima T, Suzuki T. Molecular Wires with Controllable π-Delocalization Incorporating Redox-Triggered π-Conjugated Switching Units. Chempluschem 2020; 84:634-642. [PMID: 31944008 DOI: 10.1002/cplu.201800341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Indexed: 11/11/2022]
Abstract
A perfluorobiphenyl-2,2'-diyl dication and its corresponding dihydrophenanthrene-type electron donor are interconvertible upon two-electron transfer. Redox-triggered C-C bond-formation/cleavage caused a drastic change in the torsion angle of the biphenyl unit. Thus, π-delocalization ON/OFF switching was observed as a change in the UV absorption upon electrolysis of the linearly extended analogue with two phenylethynyl groups. A further extended π-system with a molecular length of ca. 3.5 nm, which has two switching units, was synthesized. Spectroelectrograms as well as voltammetric analyses showed that the two units act nearly simultaneously because of the very small inter-unit electrostatic repulsion in the tetracationic state. Thus, the present pair is a promising candidate as a switching unit for "molecular wires" with controllable π-delocalization, in which a higher ON/OFF ratio of delocalization could be realized by incorporating multiple switching units.
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Affiliation(s)
- Wataru Nojo
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Hitomi Tamaoki
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Yusuke Ishigaki
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Ryo Katoono
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kenshu Fujiwara
- Department of Life Science, Graduate School of Engineering, Akita University, Akita, 010-8502, Japan
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, 226-8503, Japan
| | - Takanori Suzuki
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
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Yamaguchi K, Murai T, Kutsumizu S, Miwa Y, Ebihara M, Guo J, Tokitoh N. Experimental and Theoretical Examination of the Radical Cations Obtained from the Chemical and Electrochemical Oxidation of 5-Aminothiazoles. ChemistryOpen 2017; 6:282-287. [PMID: 28413765 PMCID: PMC5390811 DOI: 10.1002/open.201700016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Indexed: 11/11/2022] Open
Abstract
Chemical or electrochemical one-electron oxidation of 5-N-arylaminothiazoles was found to afford stable radical cations. For chemical oxidation, 1 equivalent of [(4-BrC6H4)3N][SbCl6] (Magic Blue, MB) was added to CH2Cl2 solutions of the thiazoles, and the thus-obtained radicals showed light absorption in the near-infrared region. Electrochemical oxidation also led to bathochromic shifts in the absorption bands, and the obtained spectra were similar to those derived from the chemically oxidized species. These radicals afforded electron paramagnetic resonance (EPR) spectra that are consistent with the notion of stable nitrogen radicals (half-life≤385 h). The EPR spectrum of a thiazole containing 4-dimethylaminophenyl groups on the nitrogen atom at the 5-position changed significantly upon adding >3 equivalents of MB. Details of the electronic structures of the experimentally obtained radical cations were generated from theoretical calculations.
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Affiliation(s)
- Kirara Yamaguchi
- Department of Chemistry and Biomolecular Science, Faculty of EngineeringGifu University, YanagidoGifu501–1193Japan
| | - Toshiaki Murai
- Department of Chemistry and Biomolecular Science, Faculty of EngineeringGifu University, YanagidoGifu501–1193Japan
| | - Shoichi Kutsumizu
- Department of Chemistry and Biomolecular Science, Faculty of EngineeringGifu University, YanagidoGifu501–1193Japan
| | - Yohei Miwa
- Department of Chemistry and Biomolecular Science, Faculty of EngineeringGifu University, YanagidoGifu501–1193Japan
| | - Masahiro Ebihara
- Department of Chemistry and Biomolecular Science, Faculty of EngineeringGifu University, YanagidoGifu501–1193Japan
| | - Jing‐Dong Guo
- Institute for Chemical ResearchKyoto University, Gokasho UjiKyoto611-0011Japan
| | - Norihiro Tokitoh
- Institute for Chemical ResearchKyoto University, Gokasho UjiKyoto611-0011Japan
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Tamaoki H, Katoono R, Fujiwara K, Suzuki T. Assembly of an Axially Chiral Dynamic Redox System with a Perfluorobiphenyl Skeleton into Dumbbell- or Tripod-type Electron Donors. Angew Chem Int Ed Engl 2016; 55:2582-6. [PMID: 26748461 DOI: 10.1002/anie.201510935] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 12/10/2015] [Indexed: 11/08/2022]
Abstract
The incorporation of F atoms endows a diethenylbiphenyl-based electron donor with configurational stability and SN Ar reactivity. The former enables the dynamic redox pair of (Rax)-1/(Rax ,R,R)-1(2+) to exhibit drastic UV/Vis and CD spectral changes upon electrolysis, whereas the latter makes it possible for (Rax)-1 to serve as a useful chiral synthon for the production of larger assemblies [(Rax ,Rax)-2 d,p,m and (Rax ,Rax ,Rax)-3] containing two or three dyrex units. These dyads and triad also exhibit a clean electrochiroptical response with isosbestic points owing to one-wave multi-electron transfer.
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Affiliation(s)
- Hitomi Tamaoki
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Ryo Katoono
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kenshu Fujiwara
- Faculty of Engineering Science, Akita University, Akita, 010-8052, Japan
| | - Takanori Suzuki
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan.
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Tamaoki H, Katoono R, Fujiwara K, Suzuki T. Assembly of an Axially Chiral Dynamic Redox System with a Perfluorobiphenyl Skeleton into Dumbbell- or Tripod-type Electron Donors. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510935] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hitomi Tamaoki
- Department of Chemistry; Faculty of Science; Hokkaido University; Sapporo 060-0810 Japan
| | - Ryo Katoono
- Department of Chemistry; Faculty of Science; Hokkaido University; Sapporo 060-0810 Japan
| | - Kenshu Fujiwara
- Faculty of Engineering Science; Akita University; Akita 010-8052 Japan
| | - Takanori Suzuki
- Department of Chemistry; Faculty of Science; Hokkaido University; Sapporo 060-0810 Japan
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5
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Suzuki T, Umezawa Y, Sakano Y, Tamaoki H, Katoono R, Fujiwara K. Reversible Interconversion between 11,11,12,12-Tetraaryl-1,4-diaza/-1,4,5,8-tetraazaanthraquinodimethanes and Their Cationic Species: Electrochromic and Halochromic Responses. CHEM LETT 2015. [DOI: 10.1246/cl.150251] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Takanori Suzuki
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Yu Umezawa
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Yuto Sakano
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Hitomi Tamaoki
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Ryo Katoono
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Kenshu Fujiwara
- Department of Chemistry, Faculty of Science, Hokkaido University
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Suzuki T, Hanada K, Katoono R, Ishigaki Y, Higasa S, Higuchi H, Kikuchi H, Fujiwara K, Yamada H, Fukushima T. Electrochiroptical Response in Aqueous Media: 9,10-Dihydrophenanthrene-9,10-diyl Dications with Michlar’s Hydrol Blue Chromophores Attached with Oligoethylene Glycol Units. CHEM LETT 2014. [DOI: 10.1246/cl.140163] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Takanori Suzuki
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Keisuke Hanada
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Ryo Katoono
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Yusuke Ishigaki
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Sho Higasa
- School of Science and Technology, Kwansei Gakuin University
| | - Hiroki Higuchi
- Institute for Materials Chemistry and Engineering, Kyushu University
| | - Hirotsugu Kikuchi
- Institute for Materials Chemistry and Engineering, Kyushu University
| | - Kenshu Fujiwara
- Department of Chemistry, Faculty of Science, Hokkaido University
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Sakano Y, Katoono R, Fujiwara K, Suzuki T. Preparation, Redox Properties, and X-ray Structures of Electrochromic 11,11,12,12-Tetraarylanthraquinodimethane and Its Bianthraquinodimethane Analogue: Drastic Geometrical Changes upon Interconversion with Dicationic Dyes. CHEM LETT 2014. [DOI: 10.1246/cl.140393] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Yuto Sakano
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Ryo Katoono
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Kenshu Fujiwara
- Department of Chemistry, Faculty of Science, Hokkaido University
| | - Takanori Suzuki
- Department of Chemistry, Faculty of Science, Hokkaido University
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