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POLAR INTERACTION-INDUCED NEW PHYSICAL PROPERTIES OF POLYSILANES

Research Project

Project/Area Number 10640564
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 機能・物性・材料
Research InstitutionOSAKA PREFECTURE UNIVERSITY

Principal Investigator

OKA Kunio  OSAKA PREFECTURE UNIVERSITY RESEARCH INSTITUTE FOR ADVANCED SCIENCE AND TECHNOLOGY ASSOCIATE PROFESSOR, 先端科学研究所, 助教授 (50090452)

Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2000: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsPOLYSILANES / POLAR INTERACTION / THERMOCHROMISM / SOLVATOCHROMISM / CONFORMATION / IONOCHROMISM / KINETIC EFFECT / HYDROGEN BONDING / 冷却速度依存性 / 極性効果 / 磁場効果 / キャリアー移動度
Research Abstract

Polar polysilanes with general formula of {R-Si-R'}_n, where R and/or R' represents alkyl, aryl or ethereal groups such as -(CH_2)_3-O-(CH_2CH_2O)_m-R, m=0-3, -(CH_2)_3-O-Ph, -(CH_2)_4-O-C_3H_7, (CH_2)_5-O-C_2H_5, and -(CH_2)_6-O-CH_3, were prepared by wutz-type coupling reaction of the corresponding dichlorosilanes. Most of the prepared polysilanes became soluble in polar solvents such as THF, CH_3CN and alcohols. Polysilanes with oligo-ethereal side groups were found to be water-soluble and show diverse polar interaction with polar solvents as well as ionic species. The first solvatochromism was observed for polysilanes of [CH_3-Si-(CH_2)_3-O-(CH_2CH_2O)_m-R (m=0-3) ; they show continuous red shift by decreasing the polarity of solvent. Unusual discontinuous type of solvatochromism was also found for poly(bis(4-propoxybutyl) silane and analogues when they make strong hydrogen bonding with hexafluoro-2-propanol. The polar side groups in the polysilanes were found to yield ionic complex with LiClO_4 in the solid state. Thermochromic behavior of theses complexes was highly dependent on the ratio of Li/Si ; red-shift was induced on cooling when the Li/Si was small while blue-shift was induced when the ratio was >4. Thermochromic behavior of the above polar polysilanes were compared with the hydrogen bond induced solvatochromism and found that there were no direct similarity between these polar-interaction induced chromotropisms. As the extension of the research, a new cooling rate dependent thermochromism was found for many polydialkylsilanes.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] K.OKA: "Thermochromism and Solvatochromism of Non-Conic Polar Polysilanes"J.Organomet.Chem.,. 611. 45-51 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Kanai: "A New Cooling-Rate Dependent Thermochromism of polydioctylsilane"Chem.Lett.,. 650-651 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Oka: "Solvatochromism and Thermochromism of Non-ionic Polar Polysilanes"J.Organomet.Chem.. 611. 45-51 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Kanai: "A New Cooling-Rate Depending Thermochromism of Poly(dioctylsilane)"Chem.Lett.. 650-651 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Kanai: "A New Cooling-Rate Depending Thermochromism of Poly (dioctylsilane)"Chemistry Letters. 650-651 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Oka: "Solvatochromism and Thermochromism of Non-ionic Polar Polysilanes"Journal of Organometallic Chemistry. 611. 45-51 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y. Nakayama: "Hole Transport in Oriented Polysilane Films"Solid State Commun.. 109. 45-49 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] L. Pan: "Mass Spectroscopy Study on Pyrolysis of Polysilanes"J. Photopolym. Sci. Technol.. 11. 133-138 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中村, 岡他4名: "Influence of Magnetic Fields on UV Absorption and Carrier Transport in polysilanes" Solid State Commun. ,. 106. 47-50 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.West,K.Oka他4名: "An Electroluminescent Polysilole and Some Dichlorooligosiloles" J.Am.Chem.Soc. ,. (in press).

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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