• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Development ofa new class of complexes of pyrazolates

Research Project

Project/Area Number 15550053
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic chemistry
Research InstitutionNagasaki University

Principal Investigator

UMAKOSHI Keisuke  Nagasaki University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20213481)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2003: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordspalladium / platinum / gold / silver / cyclic trinuclear cimplex / pyrazole / mixed-valence complex / isomerization / 混合金属錯体 / 多核錯体 / X線構造解析
Research Abstract

Polynuclear transition metal complexes with pyrazoles and/or pyrazolates have been attracting much attention because of their versatile structures and properties. By using the bridging ability of pyrazolates, it is possible to construct cyclic polynuclear complexes. Although tetranuclear, hexanuclear, or octanuclear cyclic complexes are also known, the most popular cyclic complex is the trinuclear one, in which monovalent two-coordinate metal ions are singly bridged by pyrazolates to form [M^I_3(μ-Rpz)_3](M=Ag,An,Cu,Co;Rpz=pyrazolate or substituted pyrazolates). We have been thinking the possibility that pyrazolates can form cyclic trinuclear complexes with various transition metals such as acetates, and thus we have conducted this project.
In this project, we have succeeded to synthesize the cyclic trinuclear palladium(II) complex [Pd3(μ-pz)_6], which has very similar structure to [Pd_3(μ-pz)_6]. It prompted us to make metal-metal bonding by using [Pt_3(μ-pz)_3], because [Pd_3(μ-pz)_6] is hard to oxidize due to smaller distribution of 4d orbital. Actually, we have succeeded to oxidize [Pt_3(μ-pz)_6]. The partially oxidized Pt(II,III,III)_3 species [Pt_3Br_2(μ-pz)_6] has intense blue color, which was attributed to the dσ→dσ^* transition (HOMO-LUMO transition).

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (5 results)

All 2005 2003 Other

All Journal Article (4 results) Publications (1 results)

  • [Journal Article] Unusual Magetic Properties of the Edge-Sharing Bioctahedral Dirhenium(IV) Complex of Pyridine-2-thiolate2005

    • Author(s)
      K.Umakoshi et al.
    • Journal Title

      Angewandte Chemie International Edition 44(5)

      Pages: 720-724

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Unusual Magnetic Properties of the Edge-sharing Bioctahedral Dirhenium(IV) Complex of Pyridine-2-thiolate2005

    • Author(s)
      K.Umakoshi, N.Misasa, C.Ohtsu, T.Kojima, M.Sokolov, M.Wakeshima, Y.Hinatsu, M.Onishi
    • Journal Title

      Angewandte Chemie International Edition 44(5)

      Pages: 720-724

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Pyrazolato-Bridged Polynuclear Palladium and Platinum Complexes. Synthesis, Structure, and Reactivity2003

    • Author(s)
      K.Umakoshi et al.
    • Journal Title

      Inorganic Chemistry 42(12)

      Pages: 3907-3916

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Pyrazolato-Bridged Polynuclear Palladium and Platinum Complexes. Synthesis, Structure, and Reactivity2003

    • Author(s)
      K.Umakoshi, Y.Yamauchi, K.Nakamiya, T.Kojima, M.Yamasaki, H.Kawano, Masayoshi Onishi
    • Journal Title

      Inorganic Chemistry 42(12)

      Pages: 3907-3916

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] K.Umakoshi et al.: "Pyrazolato-Bridged Polynuclear Palladium and Platinum Complexes. Synthesis, Structure, and Reactivity"Inorganic Chemistry. 42(12). 3907-3916 (2003)

    • Related Report
      2003 Annual Research Report

URL: 

Published: 2003-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi