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High-pressure ATR spectroscopic study on conformation and hydration of oxyethylene

Research Project

Project/Area Number 13640513
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical chemistry
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

FUKUHARA Koichi  Hiroshima Univ., Graduate School of Science, Assistant, 大学院・理学研究科, 助手 (90208976)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2002: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2001: ¥3,300,000 (Direct Cost: ¥3,300,000)
Keywordshigh-pressure infrared spectroscopy / oxyethylene / conformation / block compounds / ブロックオリゴマー
Research Abstract

Molecular conformation of nonionic surfactants alkyl / oligo(oxyethylene) diblock compounds H(CH_2)_n(OCH_2CH_2)_mOH (C_nE_n) and their hydration behavior in the C_nE_m-water binary system have been studied by high-pressure infrared spectroscopy. Molecular conformation, molecular packing, and hydration of the surfactants in the gel phase have been studies using a diamond attenuated total reflection cell (DATRC) and a diamond anvil cell (DAC).
We have first several sampling method for high-pressure DATRC measurement, because no standard method is available in this procedure. Consequently, we have obtained a pressure up to ca. 30 MPa with opposed anvils arrangement between a DATRC element and a pressure shoe. Accordingly, infrared measurements in pressure range from ambient pressure to ca. 5 GPa became possible with DATRC and DAC.
We have studied pressure dependent molecular form and packing for the C_nE_7 compounds, because C_nE_7s assume the * form, which is the molecular form different from the * form for the other C_nE_ms with m=3-6 and m【greater than or equal】 8 in the solid state. As the peculiar form for C_nE_7s results from molecular packing in the crystal, external pressure should perturb the molecular form and packing.
For C_<10>E_7-H_2O system, Hydrogen bonding was strengthened with increasing pressure and a conformational transformation from the * form to the * form has been observed at about 1 GPa. For C_<16>E_7-H_2O system, on the other hand, conformational transformation has not been occurred but small wavenumber sift for the infrared bands attributed to the oligo (oxyethylene) part been observed.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 福原幸一: "Melting of the All-trans Planar Modification of Triblock Oligomers α-n-alkyl-ω-alkoxyoligo(oxyethylene)s"Chemistry Letters. 2001(8). 828-829 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] FUKUHARA, Koichi: "Melting of the All-trans Planar Modification of Triblock Oligomers a-n-alkyl-w-alkoxyoligo(oxyethylene)s"Chemistry Letters. (8). 828-829 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 福原 幸一: "Melting of the All-trans Planar Modification of Triblock Oligomers α-n-alkyl-ω-alkoxyoligo(oxyethylene)s"Chemistry Letters. 2001(8). 828-829 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 福原 幸一: "Melting of the All-trans Planar Modification of Triblock Oligomers α-n-alkyl-ω-n-alkoxyoligo(oxyethylene)s"Chemistry Letters. 2001(8). 828-829 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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