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Synthesis of organo-platinum(II) and -palladium(II) complexes ofN-phenyl- andN-(p-Tolyl)pyrazole


When platinum(II) chloride dissolved in acetic acid containing concentrated hydrochloric acid was refluxed withN-phenylpyrazole(liphpz) andN-(p-tolyl)pyrazole (Htlpz), complexes of composition [Pt(N-C)Cl]2 (N-C = phpz, tlpz) were obtained, in which phpz and tlpz are coordinated through nitrogen and carbon forming a five membered metallocycle. Similar palladium(II) complexes [Pd(N-C)Cl]2 were easily prepared by the reaction of palladium(II) chloride with Hphpz and Htlpz in methanol in the presence of lithium chloride. These [M(N-C)CI]2 complexes reacted with tri-n-butylphosphine (PBu3) and pyridine (py) to give the adducts [M(N-C)ClL](L = PBu3, py). Ethylenediamine(en) and acetylacetone(Hacac) gave IPd(phpz)(en)]Cl and [Pd(phpz)(acac)] respectively. These new complexes are characterized by means of1H-n.m.r. and i.r. spectra, and probable structures are proposed.

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  1. 1.

    S. Trofimenko,Inorg. Chem., 12, 1215 (1973).

  2. 2.

    M. Nonoyama,J. Organometal. Chem., 86, 263 (1975).

  3. 3.

    J. R. Ferraro,Low Frequency Vibrations of Inorganic and Coordination Compounds, Plenum Press, New York 1971,p. 111.

  4. 4.

    L. J. Bellamy,The Infrared Spectra of Complex Molecules, 2nd Edit., Methuen, London 1966, p. 75.

  5. 5.

    T. G. Appleton, H. C. Clark, and L. E. Manzer,Coord. Cheat. Rev., 10, 335 (1973).

  6. 6.

    Y. Nakamura and K. Nakamoto,Inorg. Chem., 14, 63 (1975).

  7. 7.

    K. Nakamoto,Infrared Spectra of Inorganic and Coordination Compounds, 2nd Edit., Wiley-Interscience, New York 1973,p. 247.

  8. 8.

    R. W. Berg and K. Rasmussen,Spectrocbim. Acta, 28A, 2319 (1972).

  9. 9.

    W. J. Geary,Coord. Chem. Rev., 7, 81 (1971).

  10. 10.

    I. L. Finar and K. E. Godfrey,J. Chem. Soc., 1954, 2293.

  11. 11.

    M. Nonoyama,J. Organometal. Chem., 74, 115 (1974):82, 271 (1974).

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Correspondence to Matsuo Nonoyama.

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Nonoyama, M., Takayanagi, H. Synthesis of organo-platinum(II) and -palladium(II) complexes ofN-phenyl- andN-(p-Tolyl)pyrazole. Transition Met Chem 1, 10–13 (1975).

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  • Chloride
  • Lithium
  • Acetic Acid
  • Platinum
  • Catalysis