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2000 Fiscal Year Final Research Report Summary

Studies on Hydrophobic Association of Metal Complexes and on Structures and Properties of Oil-like State

Research Project

Project/Area Number 10440197
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic chemistry
Research InstitutionYOKOHAMA CITY UNIVERSITY

Principal Investigator

YOKOYAMA Haruhiuko  YOKOHAMA CITY UNIVERSITY, FACULTY OF SCIENCE, PROFESSOR, 理学部, 教授 (10094319)

Project Period (FY) 1998 – 2000
Keywordsoil-like state / phase separation / stacking / hvdrophobic interaction / supramolecule / metal complex / phenanthroline / solution X-ray diffraction
Research Abstract

1.Strong ion association was observed between [M (en)(phen)]^<2+> (M=Pt or Pd) complexes and 1-naphthaleneacetate ions by X-ray diffraction and conductivity measurements.
2.The solubility of 1,10-phenanthroline (phen) or 2,2'-bipyridine (bpy) for water was remarkably increased in the presence of the above metal complexes.
3.Radial distribution functions obtained by X-ray diffraction measurements of aqueous solutions dissolving [M (en)(phen)]^<2+> and phen revealed several periodic peaks having 3.5Å intervals, suggestine the existence of supramolecules having the layer structure formed by the stacking of aromatic rings of the complex and phen molecules.
4.A saecific ahenomenon was found that an aqueous solution of naphthalenesulfonate (1-NS or 2-NS) of [M (phen)_3]^<3+> or [M (bpy)_3]^<3+> (M=trivalent metal) was separated into two liquid phases of dilute and concentrated solutions in a given composition range. Their phase diagrams, similar to that of the phenol-water system, had the critical solution temperature (T_c) above which the phase-separation phenomenon disappeared. The T_c for the phen complex was significantly larger than that for the bpy complex, and the T_c for the 1-NS salt was somewhat larger than that for the 2-NS salt.
5.From X-ray diffraction measurements of concentrated aqueous solutions of [M (bpy)_3] (1-NS)_3 it was found that complexes were aggregated in solutions, a part of aromatic rings of 1-NS^- penetrated into the hydrophobic pockets of the complexes, and the solution structure was almost independent of temperature. Density fluctuations due to the localization of water molecules were observed in solutions having compositions just before the phase separation as the diffraction intensity increased at lower angles.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Yuri Mizuno: "Effects of Tripositive Cobalt(III)-Complex Ions on the Structure of a Cholesteric Mesophase Composed of Potassium N-Dodecanoyl-L-alaninate"Langmuir. 14. 7058-7064 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazutaka Kondo: "Conductivity and Solvation of Li^+ Ions of LiPF_6 in Propylene Carbonate Solutions"J.Phys.Chem.B. 104. 5040-5044 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kanno: "A New Interpretation of Anomalous Properties of Water Based on Stillinger's Postulate"J.Phys.Chem.B. 105. 2019-2026 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 横山晴彦: "迅速溶液X線回折装置を用いたX線回折実験法とデータ処理法"横浜市立大学論叢 自然科学系列. 52巻(印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yuri Mizuno, Yasuko Miyasawa, Yasuko Kitagawa, Masayasu lida, Yutaka Tada, and Haruhiko Yokoyama: "Effects of Tripositive Cobalt (III)-Complex lons on the Structure of a Cholesteric Mesophase Composed of Potassium N-Dodecanoyl-L-alaninate."Langmuir. Vol.14, No.24. 7058-7064 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazutaka Kondo, Mitsuru Sano, Akiko Hiwara, Takehiko Omi, Miho Fujita, Akiko Kuwae, Masayasu Iida, Koichi Mogi, and Haruhiko Yokoyama: "Conductivity and Solvation of Li^+ lons of LiPF_6 in Propylene Carbonate Solutions."J.Phys.Chem.B. Vol.104, No.20. 5040-5044 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kanno, H.Yokoyama, and Y.Yoshimura: "A New Interpretation of Anomalous Properties of Water Based on Stillinger's Postulate."J.Phys.Chem.B. Vol.105, No.10. 2019-2026 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Haruhiko Yokoyama: "Experimental Method and Data Treatment on X-ray Diffraction Measurements Using a Rapid Solution X-ray Diffraction Apparatus."The Bulletin of Yokohama City University. Vol.52 Natural Science (in press). (2001)

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

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Published: 2002-03-26  

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