Letter | Published:

The Trimethylplatinic Group

Nature volume 162, pages 298299 (21 August 1948) | Download Citation



Pope and Peachey1 prepared diamminotrimethyl platinic iodide, (CH3)3PtI(NH3)2, readily soluble in alcohol, but sparingly soluble in water. We now find that pyridine added to trimethylplatinic iodide in benzene gives after concentration dipyridinotrimethyl-platinic iodide, (CH3)3PtI(C5H5N)2, m.p. 168°, without previous decomposition, and that similarly from all proportions of dipyridyl and trimethylplatinic iodide, dipyridyltrimethylplatinic iodide, (CH3)3PtI, dipy, is obtained, insoluble in water, but soluble in chloroform and acetone, m.p. 268–273°. It is apparently unchanged by boiling with dilute acetic acid, hydrochloric acid, ammonia or twice normal sodium hydroxide. It is, however, decomposed by ethylene diamine with formation of sesquiethylene-diaminetrimethylplatinic iodide, 2(CH3)3PtI.3en which may be recrystallized from water. The latter compound can also be prepared from excess of ethylene diamine and trimethylplatinic iodide in benzene. Its structure is probably : recalling that of iron enneacarbonyl2. On refluxing ethylenediamine with excess of trimethylplatinic iodide in benzene, trimethylplatinicmonoethylene-diamine iodide, m.p. 204° with decomposition, is obtained. Both ethylenediamine compounds are soluble in water. All four compounds, as also the stable association of trimethylplatinic acetylacetone into double molecules3,4, are examples of the familiar stability of 6-covalent compounds of quadrivalent platinum.

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  1. 1.

    and , J. Chem. Soc., 95, 571 (1909).

  2. 2.

    and , J. Chem. Soc., 289 (1939).

  3. 3.

    , J. Chem. Soc., 565 (1928).

  4. 4.

    and , J. Chem. Soc., 21 (1933).

  5. 5.

    , und "Handbuch der Physik", 24, 519.

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  1. Bristol University, and Mid-Essex Technical College and School of Art, Chelmsford.

    • W. J. LILE
  2. Universities of Bristol and Edinburgh.

    • R. C. MENZIES


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