A dinuclear cation with both four- and five-coordinate cobalt(II).
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abstract
The reaction of cobalt dichloride with the lithium salt of 2,6-diphenyliminopiperidine, Li(DPhIP), leads to the Co2(DPhIP)3+ cation. The DPhIP ligands in this cation each coordinate in such a way that two adjacent nitrogen atoms are chelated to one cobalt atom while the remaining one is bonded to the other cobalt atom. This leads to a structure in which one Co(II) ion is four-coordinate while the other is five-coordinate. The Co-Co distance of ca. 3.1 implies that there is no direct metal to metal bonding.