Abstract
BY acting with iso-butylenediamine upon a new compound, namely, the mixed -diammine Pt(NH3) (NH2Et)Cl2, we have obtained a mixture of two isomeric -plato-tetrairimines of formula [Pt(NH3) (NH2Et) (NH2.CH2.CMe2.NH2)]Cl2, which have been separated. These substances, which are necessarily both of -structure owing to the presence of the chelate group, do not become interchanged, and they give rise to plato-salts which are unmistakably different. A similar pair of isomeric -plato-tetrammines, [Pt(NH2.CH2.CMe2.NH2)2]Cl2, has also been obtained in admixture, giving rise to a mixture of two different plato-salts which have been separated. The pairs of isomerides almost certainly represent cis- and trans- forms in each case, and their existence seems to us to afford the first authentic chemical evidence of planar structure among the plato-tetrammines, in agreement with Cox's evidence based on the X-ray crystal diagram of [Pt(NH3)4]Cl2.
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DREW, H., HEAD, F. Stereochemistry of Platinum. Nature 132, 210 (1933). https://doi.org/10.1038/132210b0
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DOI: https://doi.org/10.1038/132210b0
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