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2002 Fiscal Year Final Research Report Summary

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
Keywordshigh-pressure infrared spectroscopy / oxyethylene / conformation / block compounds
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.

  • Research Products

    (2 results)

All Other

All Publications (2 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
  • [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

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Published: 2004-04-14  

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