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Excited state aromaticity in strained 4pi electron ring system: Synthesis and its application to open-shell molecules

Research Project

Project/Area Number 18K05073
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 33010:Structural organic chemistry and physical organic chemistry-related
Research InstitutionHiroshima University

Principal Investigator

Nakamoto Masaaki  広島大学, 先進理工系科学研究科(理), 准教授 (90334044)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords高歪み結合 / 反芳香族性 / シグマ共役 / シクロブタジエン / 原子価異性化 / ビラジカル / 高歪みσ結合 / 反芳香族分子 / ジラジカル構造 / テトラヘドラン / 典型元素化合物 / 高歪み分子 / 開殻系分子 / 高周期典型元素 / 励起芳香族性 / 速度論的安定化 / ジラジカル / 光異性化 / 反芳香族 / 高歪σ結合 / 開殻分子
Outline of Final Research Achievements

Experimental studies on molecular conversion induced by light and heat, focusing on tetrahedrane, were carried out. The isomerization of the molecule consisting of highly strained carbon sigma bonds was investigated to form cyclobutadiene, which has a unique pi-electron system known as antiaromaticity. Recently we have expanded a simple and reliable method for synthesizing cyclobutadiene by photoinduced electron transfer of the corresponding tetrahedrane precursors. Based on the Huckel rule, cyclobutadiene shows antiaromatic character because of four pi electrons in single cyclic pi conjugation systems. Therefore the research of a stable compound was quite limited. Up to now, more than 20 stable tetrahedrane derivatives, including boron-substituted and phosphorus substituted and so on, have been successfully synthesized. Furthermore, most of them could be converted into the corresponding isomer of cyclobutadienes.

Academic Significance and Societal Importance of the Research Achievements

芳香族分子を平面から歪ませ、球面状にしたフラーレン関連分子やシクロカーボンのようなベルト状芳香族分子に注目が集まっている。また適切に共役系を設計することで、non-ケクレジラジカル構造の分子の合成も報告されている。環状4nパイ電子系の分子は反芳香族性を有するとされているが、このような構造的特徴を有した分子は一般に反応活性であり,その物性は未解明なまま残されている。特徴的なπ電子系では、光エネルギーを利用する化学変換の機構として働くことが挙げられ、π電子系と光エネルギーの相互作用を詳細に理解する上で重要な概念の一つされている。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (17 results)

All 2021 2020 2019 2018 Other

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results) Presentation (10 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Remarks (1 results)

  • [Journal Article] Complexation of B(C6F5)3 and 9,10-Dicyanoanthracene: Dual Role of Borane as Spatial and Electronic Tuner2020

    • Author(s)
      Imagawa Taiki, Nakamoto Masaaki, Shang Rong, Adachi Yohei, Ohshita Joji, Tsunoji Nao, Yamamoto Yohsuke
    • Journal Title

      Chemistry Letters

      Volume: 49 Issue: 9 Pages: 1022-1025

    • DOI

      10.1246/cl.200339

    • NAID

      130007897108

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Digallane Gold Complex with a 12-Electron Auride Center: Synthesis and Computational Studies2020

    • Author(s)
      Susukida Kohei, Lugo-Fuentes Leonardo I., Matsumae Shozo, Nakanishi Kazuki, Nakamoto Masaaki、Yamamoto Yohsuke、Shang Rong, Barroso-Flores Joaqun, Jimenez-Halla J. Oscar C.
    • Journal Title

      Organometallics

      Volume: 39 Issue: 23 Pages: 4372-4379

    • DOI

      10.1021/acs.organomet.0c00557

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Synthesis and properties of hypervalent electron-rich pentacoordinate nitrogen compounds2020

    • Author(s)
      Yan Chenting, Takeshita Masato, Nakatsuji Jun-ya, Kurosaki Akihiro, Sato Kaoko, Shang Rong, Nakamoto Masaaki, Yamamoto Yohsuke, Adachi Yohei, Furukawa Ko, Kishi Ryohei, Nakano Masayoshi
    • Journal Title

      Chemical Science

      Volume: 11 Issue: 19 Pages: 5082-5088

    • DOI

      10.1039/d0sc00002g

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Substituent Effect of Bridged Triarylamine Helicenes on Light-emitting and Charge Transfer Properties2020

    • Author(s)
      Yan Chenting、Shang Rong、Nakamoto Masaaki、Yamamoto Yohsuke、Adachi Yohei
    • Journal Title

      Chemistry Letters

      Volume: 49 Issue: 5 Pages: 457-460

    • DOI

      10.1246/cl.200089

    • NAID

      130007840174

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Bis(diphenylphosphinyl)-functionalized dipyrido-annulated NHC towards copper(I) and silver(I)2019

    • Author(s)
      Sihan Zhang, Rong Shang, Masaaki Nakamoto, Yohsuke Yamamoto, Yohei Adachi, Joji Ohshita
    • Journal Title

      Dalton Trans.

      Volume: 48 Issue: 32 Pages: 12250-12256

    • DOI

      10.1039/c9dt02435b

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Synthesis and characterization of a pair of O-fac/O-mer 12-P-6 alkyloxaphosphates with a P-O-C-C four-membered ring2019

    • Author(s)
      Xin-Dong Jiang, Yuya Toya, Shiro Matsukawa, Satoshi Kojima, J. Oscar C. Jimenez-Halla, Rong Shang, Masaaki Nakamoto, Yohsuke Yamamoto
    • Journal Title

      Chemical Science

      Volume: 10 Issue: 12 Pages: 3466-3472

    • DOI

      10.1039/c8sc05158e

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] B(C6F5)3-ジシアノアントラセンLewis付加体の合成、還元および構造解析:光学特性と電子構造に及ぼすLewis酸の影響2021

    • Author(s)
      今川大樹,中本真晃,Shang Rong,吉田拡人,山本陽介
    • Organizer
      日本化学会第101春季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] B(C6F5)3-ジシアノアントラセンLewis付加体の合成、還元および構造解析:Lewis酸がもたらすπ共役系の変化2021

    • Author(s)
      今川大樹,中本真晃,Shang Rong,吉田拡人,山本陽介
    • Organizer
      第14回有機π電子系シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] B(C6F5)3-ジシアノアントラセン錯体の合成、還元および構造解析:光学特性と電子構造に及ぼすルイス酸の影響2020

    • Author(s)
      今川大樹, 中本真晃, Shang Rong, 山本陽介
    • Organizer
      第47回有機典型元素化学討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 立体障害のある新規アミノ基を用いたジアミノジボレンの合成検討2020

    • Author(s)
      鈴木博喜・森迫祥吾・Shang Rong・山本陽介・中本真晃
    • Organizer
      第47回有機典型元素化学討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 2つのジアミノボリル基を配位部とした新規ピンサー配位子の合成と錯形成2020

    • Author(s)
      一ノ関諒・Shang Rong・中本真晃・山本陽介
    • Organizer
      第47回有機典型元素化学討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Attempts to synthesize antiaromatic s-dimer: Silyl group conversion of cobalt complex2020

    • Author(s)
      Airi Oguri, Masaaki Nakamoto, Rong Shang, Yohsuke Yamamoto
    • Organizer
      The 17th Nano Bio Info Chemistry symposium
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 光異性化によるホウ素置換基を有するシクロブタジエンの合成2019

    • Author(s)
      今川大樹・中本真晃・稲垣佑亮・関口章・Shang Rong・山本陽介
    • Organizer
      第46回有機典型元素化学討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] π共役拡張型シクロブタジエンの合成と反応性2019

    • Author(s)
      鈴木啓太・Shang Rong・中本真晃・山本陽介・岡庭健斗・小林譲・関口章
    • Organizer
      日本化学会中国四国支部大会 徳島大会
    • Related Report
      2019 Research-status Report
  • [Presentation] ケイ素置換基を有する高歪み化合物の構造と反応性:ジラジカル性を示すシクロブタジエン2018

    • Author(s)
      中本真晃
    • Organizer
      第22回ケイ素化学協会シンポジウム
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Tetrahedranes and Cyclobutadienes: Diradical Character of para-Phenylene-linked Cyclobutadiene2018

    • Author(s)
      Masaaki Nakamoto, Akira Sekiguchi
    • Organizer
      AROMATICITY-2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 有機典型元素化学研究室

    • URL

      https://home.hiroshima-u.ac.jp/hetero2/

    • Related Report
      2019 Research-status Report 2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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