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1992 Fiscal Year Final Research Report Summary

Molecular Design of Amphiphiles Containing Mixed Ligand Transition Metal Complexes

Research Project

Project/Area Number 03650690
Research Category

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

Allocation TypeSingle-year Grants
Research Field Synthetic chemistry
Research InstitutionUniversity of Tokyo,

Principal Investigator

YASHIRO Morio  University of Tokyo Faculty of Engineering, Lecturer, 工学部, 講師 (30192785)

Project Period (FY) 1991 – 1992
KeywordsAmphiphile / Transition metal complex / Mixed ligand complex / Micelle / Solvatochromism / Surface tension reducing ability
Research Abstract

(1) Cobalt(III) and nickel(II) complexes having an alkyl long chain are newly prepared. They showed clear break points in the surface tension-concentration curves, indicating their aggregation in aqueous solutions. Critical micelle concentration (cmc) and surface tension reducing ability largely depended on the length of the alkyl-chain, the position of its substitution on the ligand, and counter ions. The results indicate that the structure of the complex part can influence the aggregation behavior considerably. Therefore, amphiphilic metal complexes are expected to be used to construct a variety of aggregation molphologies.
(2) Mixed ligand amphiphilic cobalt(III) complexes containing N-dodecylethylenediamine and a chiral tetraamine provided a novel example that the chirality around the octahedral metal center affects the aggregation behavior of the complexes.
(3) Solvatochromism was observed for a nickel(II)-tetraamine complex having a dodecyl chain, due to an interconversion between a paramagnetic octahedral (blue) and a diamagnetic square planar (orange) nickel complex. The interconversion of the steric structure of the polar head will be useful in designing amphiphiles whose aggregation can be highly controlled by external stimulations.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] M.YASHIRO,K.MATSUMOTO,and S.YOSHIKAWA: "First Evidence of the Effect of Chirality around the Octahedral Metal Center on the Aggregation Behavior of an Amphiphilic Co(III)Complex" Chem.Lett.1429-1432 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.YASHIRO,K.MATSUMOTO,N.SEKI,and S.YOSHIKAWA: "Preparation of Cobalt(III)and Nickel(II)Complexes Having an Alkyl Long Chain and Their Surface Tension Reducing Abilities" Bull.Chem.Soc.Jpn.66. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Yashiro, K. Matsumoto, and S. Yoshikawa: "First Evidence of the Effect of Chirality around the Octahedral Metal Center on the Aggregation Behavior of an Amphiphilic Cobalt(III) Complex" Chem. Lett.1429-1432 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Yashiro, K. Matsumoto, N. Seki, and S. Yoshikawa: "Preparation of Cobalt(III) and Nickel(II) Complexes Having an Alkyl Long Chain and Their Surface Tension Reducing Abilities" Bull. Chem. Soc. Jpn.66 (1993)

    • 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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