Studies on Crystals of Metallic Tris-ethylenediamine-complexes. I. The Crystal Structure of Dl-Tris-ethylenediamine-cobalt (III) Chloride Trihydrate, [Co en3]Cl3·3H2O

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Abstract
The crystal structure of [Co en3]Cl3·3H2O has been determined by X-ray methods. It is trigonal D3d4–P\bar3c1 with four formula units in a cell of dimensions: a=11.50±0.02, c=15.52±0.04 Å. The configuration of the two stereoisomeric complex ions [Co en3]3+ is described. The three ethylenediamine molecules in a complex ion assume “ gauche ” forms; their nitrogen atoms form a slightly distorted octahedron around a central cobalt atom. It is shown that ionic bonds essentially link the complex ions in the structure. The watermolecules are weakly associated to chlorine it is found that a single crystal can be completely dehydrated by gently heating at 120°C, without bringing about any remarkable change in its appearance, except a loss. of transparency. A single crystal oscillation photograph was obtained even after complete dehydration.