Issue 3, 1972

Structural disorder in the geometric isomers of L-tris{(–)propylenediamine}cobalt(III) salts

Abstract

Single-crystal and X-ray powder data are used to show that salts of the complex ions cis- and trans-L-tris[(–)-propylenediamine]cobalt(III) fall into two classes with regard to disorder of the complex ions. In the first class typified by the dithionate and tris(malonato)-chromate(III) salts, the geometric isomers are indistinguishable since the cations are disordered giving rise to an average D3 symmetry. In the second class typified by the bromide salt, the cis-isomer has an ordered (C3 symmetry) structure. In this case the lattice does not have space to accommodate the disordered cation or the trans-isomer. The trans-isomer does not crystallise but forms an amorphous glass.

A survey of nine salts revealed none in which the trans-isomer had an ordered arrangement and it was, therefore, impossible directly to prove its existence by X-ray structure analysis.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1972, 295-297

Structural disorder in the geometric isomers of L-tris{(–)propylenediamine}cobalt(III) salts

P. F. Crossing and M. R. Snow, J. Chem. Soc., Dalton Trans., 1972, 295 DOI: 10.1039/DT9720000295

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