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Washino Y, Michinobu T. Cross-linking and postfunctionalization of polymer films by utilizing the orthogonal reactivity of 7,7,8,8-tetracyanoquinodimethane. Phys Chem Chem Phys 2016; 18:2288-91. [DOI: 10.1039/c5cp05180k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spontaneous radical copolymerization of poly(7,7,8,8-tetracyanoquinodimethane) and α-chloromethylstyrene followed by click postfunctionalization produces colored and redox-active cross-linked polymer films.
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Yuan Y, Michinobu T, Satoh N, Ashizawa M, Han L. Efficient Synthesis and Photosensitizer Performance of Nonplanar Organic Donor-Acceptor Molecules. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2015; 15:5856-5866. [PMID: 26369162 DOI: 10.1166/jnn.2015.10032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nonplanar organic donor-acceptor molecules bearing a carboxylic acid group were synthesized by the formal [2+2] cycloaddition-retroelectrocyclization reaction between aniline-substituted alkynes and tetracyanoethylene (TCNE) or 7,7,8,8-tetracyanoquinodimethane (TCNQ). This reaction offers an atom-economic one-step approach to donor-acceptor chromophores in satisfactory high yields. The resulting donor-acceptor molecules were characterized by conventional analytical techniques. In addition, the nonplanarity and intermolecular interactions were investigated by X-ray crystallography. The energy levels and intramolecular charge-transfer (CT), evaluated by UV-Vis-near IR spectroscopy and electrochemistry, suggested that there is a linear correlation between the optical and electrochemical band gaps. Based on these structural and electronic analyses, the photosensitizer performances of the donor-acceptor molecules in dye-sensitized solar cells (DSSCs) were initially investigated using TiO2 or SnO2 electrodes. Although the power conversion efficiencies were limited, the incident-photon-to-current-conversion efficiency (IPCE) spectra indicated a better photocurrent generation for the devices on SnO2 as compared to those on TiO2.
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Michinobu T. Macromol. Chem. Phys. 13/2015. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201570041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Wang Y, Masunaga H, Hikima T, Matsumoto H, Mori T, Michinobu T. New Semiconducting Polymers Based on Benzobisthiadiazole Analogues: Tuning of Charge Polarity in Thin Film Transistors via Heteroatom Substitution. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00802] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Michinobu T. Click Functionalization of Aromatic Polymers for Organic Electronic Device Applications. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201500086] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Okuda H, Koyama Y, Uchida S, Michinobu T, Sogawa H, Takata T. Reversible Transformation of a One-Handed Helical Foldamer Utilizing a Planarity-Switchable Spacer and C2-Chiral Spirobifluorene Units. ACS Macro Lett 2015; 4:462-466. [PMID: 35596314 DOI: 10.1021/acsmacrolett.5b00176] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Polymeric quaterthiophenes containing optically active C2-chiral spirobifluorene skeletons were synthesized as a new type of helical foldamers, and their higher-order structures were investigated. Oxidization of quaterthiophene moieties caused the spacer units to be in planar structure, leading the conformation of the polymer to be a coil-shaped, rigid helix. This transformation was reversibly performed.
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Keshtov ML, Godovsky DY, Khokhlov AR, Mizobe T, Fujita H, Goto E, Hiyoshi J, Nakamura S, Kawauchi S, Higashihara T, Michinobu T. Synthesis and photovoltaic properties of thieno[3,4-b
]pyrazine or dithieno[3′,2′:3,4;2″,3″:5,6]benzo[1,2-d
]imidazole-containing conjugated polymers. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/pola.27570] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Wang Y, Klein MFG, Hiyoshi J, Kawauchi S, Wong WWH, Michinobu T. Bulk-Heterojunction Organic Solar Cells Based on Benzobisthiadiazole Semiconducting Polymers. J PHOTOPOLYM SCI TEC 2015. [DOI: 10.2494/photopolymer.28.385] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ko YG, Hahm SG, Murata K, Kim YY, Ree BJ, Song S, Michinobu T, Ree M. New Fullerene-Based Polymers and Their Electrical Memory Characteristics. Macromolecules 2014. [DOI: 10.1021/ma5021402] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Washino Y, Michinobu T. Sequence-Regulated Linear Polymers with Ion-Sensing Charge-Transfer Chromophores by the Multiple Click Approach. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400275] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ko YG, Kim DM, Kim K, Jung S, Wi D, Michinobu T, Ree M. Digital memory versatility of fully π-conjugated donor-acceptor hybrid polymers. ACS APPLIED MATERIALS & INTERFACES 2014; 6:8415-8425. [PMID: 24779635 DOI: 10.1021/am5013134] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The fully π-conjugated donor-acceptor hybrid polymers Fl-TPA, Fl-TPA-TCNE, and Fl-TPA-TCNQ, which are composed of fluorene (Fl), triphenylamine (TPA), dimethylphenylamine, alkyne, alkyne-tetracyanoethylene (TCNE) adduct, and alkyne-7,7,8,8-tetracyanoquinodimethane (TCNQ) adduct, were synthesized. These polymers are completely amorphous in the solid film state and thermally stable up to 291-409 °C. Their molecular orbital levels and band gaps vary with their compositions. The TCNE and TCNQ units, despite their electron-acceptor characteristics, were found to enhance the π-conjugation lengths of Fl-TPA-TCNE and Fl-TPA-TCNQ (i.e., to produce red shifts in their absorption spectra and significant reductions in their band gaps). These changes are reflected in the electrical digital memory behavior of the polymers. Moreover, the TCNE and TCNQ units were found to diversify the digital memory modes and to widen the active polymer layer thickness window. In devices with aluminum top and bottom electrodes, the Fl-TPA polymer exhibits stable unipolar permanent memory behavior with high reliability. The Fl-TPA-TCNE and Fl-TPA-TCNQ devices exhibit stable unipolar permanent memory behavior as well as dynamic random access memory behavior with excellent reliability. These polymer devices were found to operate by either hole injection or hole injection along with electron injection, depending on the polymer composition. Overall, this study demonstrated that the incorporation of π-conjugated cyano moieties, which control both the π-conjugation length and electron-accepting power, is a sound approach for the design and synthesis of high-performance digital memory polymers. The TCNE and TCNQ polymers synthesized in this study are highly suitable active materials for the low-cost mass production of high-performance, polarity-free, programmable, volatile, and permanent memory devices that can be operated with very low power consumption, high ON/OFF current ratios, and high reliability.
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Yuan Y, Michinobu T, Oguma J, Kato T, Miyake K. Macromol. Chem. Phys. 13/2013. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201370044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yuan Y, Michinobu T, Oguma J, Kato T, Miyake K. Attempted Inversion of Semiconducting Features of Platinum Polyyne Polymers: A New Approach for All-Polymer Solar Cells. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201300245] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Michinobu T, Okoshi K, Murakami Y, Shigehara K, Ariga K, Nakanishi T. Structural requirements for producing solvent-free room temperature liquid fullerenes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5337-5344. [PMID: 23547957 DOI: 10.1021/la400969f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A new class of solvent-free room temperature liquid fullerenes was synthesized by attaching a single substituent of 1,3,5-tris(alkyloxy)benzene unit to C60 or C70 under the Prato conditions. Although the C60 monoadducts were single components after chromatographic purification, the C70 monoadducts were isomeric mixtures due to the prolate spheroidal π-chromophore. The alkyl chain length of the substituents significantly affected both melting points and rheological behavior of the fullerene derivatives. When the alkyl chains were short, the intermolecular π-π interactions of adjacent fullerene cores led to a melting point higher than room temperature. In contrast, in the case of exceedingly long alkyl chains, such as eicosyl (-C20H41) and docosanyl (-C22H45) groups, the van der Waals interactions among neighboring alkyl chains became dominant. Accordingly, only medium alkyl chain lengths could provide solvent-free fluidic fullerenes with low melting points. The rheological measurements of the liquid fullerenes at 25 °C revealed their unique liquid characteristics; molecular-level friction (or viscosity) and nanometer-scale clustering were noticed. It is generally thought that alkyl chains serve as a stabilizer of the fullerene core units. Thus, a longer chain or higher plasticity of the stabilizers would promote the disturbance of the core-core interactions. It was indeed shown that longer alkyl chains resulted in a lower fluid viscosity. It was also found that metastable solid phases were produced by the noticeable van der Waals interaction between the long alkyl chains especially when a symmetric C60 core was adopted. This interesting finding enabled the comparison of electrochemical activities of the C60 unit between the solvent-free liquid and metastable solid form, which revealed a superior electrochemical activity in the liquid state.
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Yuan Y, Choi W, Nishide H, Michinobu T. Sequential and click-type postfunctionalization of regioregular poly(3-hexylthiophene) for realization of n-doped multiplet state. Chem Sci 2013. [DOI: 10.1039/c2sc21334f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Michinobu T, Li Y, Hyakutake T. Polymeric ion sensors with multiple detection modes achieved by a new type of click chemistry reaction. Phys Chem Chem Phys 2013. [DOI: 10.1039/c2cp43203j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Fujita H, Michinobu T, Tokita M, Ueda M, Higashihara T. Synthesis and Postfunctionalization of Rod–Coil Diblock and Coil–Rod–Coil Triblock Copolymers Composed of Poly(3-hexylthiophene) and Poly(4-(4′-N,N-dihexylaminophenylethynyl)styrene) Segments. Macromolecules 2012. [DOI: 10.1021/ma301692b] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Yuan Y, Michinobu T. Macromol. Chem. Phys. 20/2012. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201290063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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71
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Yuan Y, Michinobu T. Construction of Donor-Acceptor Chromophores in Platinum Polyyne Polymer by [2 + 2] Cycloaddition of Organic Acceptors. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201200316] [Citation(s) in RCA: 17] [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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72
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Li Y, Michinobu T. Click synthesis and reversible electrochromic behaviors of novel polystyrenes bearing aromatic amine units. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.25990] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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73
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Fujita H, Michinobu T. Synthesis and Photovoltaic Properties of 1,8-Carbazole-Based Donor-Acceptor Type Conjugated Polymers. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201100591] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Li Y, Ashizawa M, Uchida S, Michinobu T. Colorimetric sensing of cations and anions by clicked polystyrenes bearing side chain donor–acceptor chromophores. Polym Chem 2012. [DOI: 10.1039/c2py20230a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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75
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Washio Y, Michinobu T. Emergence of Colorimetric Chemosensor Ability of Metal Ions in TCNQ Polyester by Postfunctionalization. J PHOTOPOLYM SCI TEC 2012. [DOI: 10.2494/photopolymer.25.267] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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