Bis-(5-ethyl, 5-phenylbarbiturato)-bisimidazole Complexes of Copper(II), Nickel(II), and Cobalt(II)

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Abstract
In a recent communication Wang and Craven1 reported that in the bis (5,5-diethylbarbiturato)-bisimidazole complexes of cobalt(II) and zinc(II), the metals are tetrahedrally coordinated by nitrogen atoms. These authors2–3 have also shown that the corresponding nickel(II) complexes crystallize in three crystalline forms (green, orange, and pale-blue) and each form corresponds to a different arrangement of ligands around the central nickel atom (Table I). They have also shown by X-ray crystallography that the corresponding copper(II) and a pale-blue crystalline form of the nickel(II) complexes are six-coordinated as shown in Figure 1. Here, each metal is coordinated in a square-planar arrangement by a N and 0 from each barbiturate (53-diethylbarbiturate) residue forming unusual four-membered rings. Because of this interesting stereochemical finding, and because of the biological importance of barbiturate complexes, the corresponding phenobarbiturate (5-ethyl, 5-phenylbarbiturate) complexes have been prepared and investigated.

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