Studies on Dimethylglyoximo cobalt(III) Complexes. 1. The Preparation and Some Properties of Tris-(dimethylglyoximo)-cobalt(III)

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Abstract
Tris-(dimethylglyoximo)-cobalt(III) was newly synthesized by making use of dipotassium dimethylglyoximate. The crystals are quite stable in the atmosphere similarly to other so-called luteo-complexes, and orangeyellow in color. It is soluble in organic solvents, e.g., chloroform, alcohol and dioxane, as well as in water, but insoluble in benzene and acetone. The absorption spectrum of this compound in aqueous solution was measured, and it was concluded that dimethylglyoxime is a considerably hypsochromic ligand. Some discussions concerning the stabilities of bis-(dimethylglyoximo)-cobalt(III) complexes were given and they reached the following conclusions: (1) the distinguished stability of bis-(dimethylglyoximo)-derivatives is probably due to the O–H–O hydrogen bonds which are expected for the planar configuration of two dimethylglyoximic ions, and (2) the synthesis of tris-(dimethylglyoximo)-cobalt(III) can be successfully achieved only by interrupting the formation of those hydrogen bonds in the course of co-ordination of the ligands.

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