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1992 Fiscal Year Final Research Report Summary

Structural Chemical Study of Nonionic Surfactant-Water Systems by Vibrational Spectroscopy

Research Project

Project/Area Number 03640427
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 構造化学
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

FUKUHARA Koichi  Hiroshima University., Faculty of Science Research Associate, 理学部, 助手 (90208976)

Project Period (FY) 1991 – 1992
KeywordsNonionic Surfactants / Conformation / Vibrational Spectroscopy
Research Abstract

For elucidation of various characteristics of binary systems of alkyloxyethylene nonionic surfactants and water, properties of the hydrophilic oxyethylene chain play an important role. In particular, the conformational behavior of the oxyethylene chain is one of the important factors for understanding the structure of the system. Accordingly, in this year of 1992, conformational behavior of noncyclic and cyclic oxyethylene chains was studied in detail. The model compounds used are alpha-methyl-omega-methoxyhexakis(oxyethylene) and 18-crown-6, respectively. By utilizing infrared spectroscopy in combination with normal coordinate calculations, hydration and conformational states of the oxyethylene chain were examined in an extensive concentration range. Conformation of the OC-CO group was elucidated on the basis of changes of the hydration structure. With addition of water to neat liquid, the gauche conformation of the OC-CO group is more stabilized with the formation of bridged hydrogen bonds between the ether oxygens of the oxyethylene unit and water molecules. The distance between the oxygens of the gauche OC-CO group is about 0.28 nm. This distance is, however, too short for a single water molecule to form a stable bridged hydrogen bond, but may be adequate to stabilize the gauche structure through proton-lone pair interactions.
In this year, another study was also performed on polymorphic behavior of C_<16>E_3, which is one of the typical alkyloxyethylene nonionic surfactants. Changes in crystallinity and conformation with phase transformations were elucidated by Raman spectroscopy. This polymorphic phenomenon is closely related to the structure of various mesophases formed by nonionic surfactants in aqueous solution.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 松浦 博厚: "Conformational state of nonionic surfactants" Journal of Physical Chemistry. 95. 10800-10810 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松浦 博厚: "Vibrational spectra,force field and normal modes of 4,13-diaza-18-crown-6" Journal of Molecular Structure. 265. 269-282 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 正時 聖: "Conformational behavior of polymorphic α-hexadecyl-ω-hydroxytris(oxyethylene)(C_<16>E_3)studied by Raman spectroscopy" Journal of Physical Chemistry.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福原 幸一: "Solid-state phase behavior of a binary system of 18-crown-6 and water" Journal of Physical Chemistry.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福原 幸一: "Vibrational spectroscopic study of conformational behavior of oxyethylene compounds in aqueous solution" Journal of Physical Chemistry.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福原 幸一: "Raman spectroscopic study of molecular conformation of partially deuterated alkyloligo(oxyethylene)surfactants" Journal of Molecular Structure.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Matsuura, K.Fukuhara, K.Takashima, M.Sakakibara: "Conformational state of nonionic surfactants" Journal of Physical Chemistry. 95,26. 10800-10810 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Matsuura, K.Fukuhara, K.Kaneko, H.Yoshida: "Vibrational spectra, force field and normal modes of 4,13-diaza-18-crown-6" Journal of Molecular Structure. 265,3/4. 269-282 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Masatoki, K.Fukuhara, H.Matsuura: "Conformational behavior of polymorphic alpha-hexadecyl-omega-hydroxytris(oxyethylene) (C_<16>E_3) studied by Raman spectroscopy" Journal of Physical Chemistry.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Fukuhara, H.Matsuura: "Solid-state phase behavior of a binary system of 18-crown-6 and water" Journal of Physical Chemistry.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Fukuhara, H.Matsuura: "Vibrational spectroscopic study of conformational behavior of oxyethylene compounds in aqueous solution" Journal of Physical Chemistry.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Fukuhara, H.Matsuura: "Raman spectroscopic study of molecular conformation of partially deuterated alkyloligo(oxyethylene) surfactants" Journal of Molecular Structure.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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