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2016 Fiscal Year Annual Research Report

スピロ炭素戦略を用いた立体規則性共役系高分子の創製

Research Project

Project/Area Number 15J05745
Research InstitutionNational Institute for Materials Science

Principal Investigator

徐 錦嘉  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 外来研究者

Project Period (FY) 2015-04-24 – 2017-03-31
Keywordsmacrocyclization / bifluorenyldene / electron acceptors / twisted but conjugated
Outline of Annual Research Achievements

a) I successfully established a straightforward approach to synthesize the highly strained 9,9’-bifluorenylidene cyclic dimer (CBF) from 9,9’-bifluorenylidene (BF) by unexpected intramolecular cyclization via typical Yamamoto coupling reaction conditions. Sequential Yamamoto coupling reactions potentially allowed us to obtain well-defined and highly twisted but conjugated 9,9'-BF ladder tetramer (LBF).
b) The photophysical and electrochemical properties of BF and CBF were systematically investigated by using UV-vis absorption and CV measurements. The BF and CBF were demonstrated to have ability to accept two electrons, probably favored by release of steric hindrance from proximal aromatic rings and development of a 14- electron system.
c) The thermal behavior and phase transition processes of BF and CBF was determined by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Characterization by DSC reveals no phase transitions between 25°C and 200°C for CBF, presumedly due to the existence of enantiomeric mixture namely (P, P) and (M, M), yielding CBF more amorphous than crystalline. In stark contrast, BF showed the broadening melting point at around 153°C in the second heating process, probably attributable to multi-conformations from BF. Surprisingly, in the cooling process, one sharp peak at 150°C in additional to one small peak at 154°C was observed, thus we infer that multiple phase transitions occur sequentially by alternating the conformation of BF.

Research Progress Status

28年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

28年度が最終年度であるため、記入しない。

  • Research Products

    (2 results)

All 2016

All Journal Article (2 results) (of which Acknowledgement Compliant: 2 results)

  • [Journal Article] Red-Green-Blue Trichromophoric Nanoparticles with Dual Fluorescence Resonance Energy Transfer: Highly Sensitive Fluorogenic Response Toward Polyanions2016

    • Author(s)
      Jinjia Xu, Atsuro Takai and Masayuki Takeuchi
    • Journal Title

      Chem. Eur. J.

      Volume: 22 Pages: 13014-13018

    • DOI

      10.1002/chem.201602759

    • Acknowledgement Compliant
  • [Journal Article] Multiple Emissions from Indenofluorenedione in Solution and Polymer Films2016

    • Author(s)
      Jinjia Xu, Atsuro Takai and Masayuki Takeuchi
    • Journal Title

      RSC Adv.

      Volume: 6 Pages: 80867-80871

    • DOI

      10.1039/c6ra17765d

    • Acknowledgement Compliant

URL: 

Published: 2018-01-16  

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