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"[2-(2-{Bis[2-(1H-imidazol-2-ylmethyleneamino)ethyl]amino}ethyliminomethyl)imidazolido]cobalt(III) bis(tetrafluoridoborate) monohydrate"
A.M. Atria, G. Corsini, A. Talamilla, M.T. Garland and R. Baggio
Acta Cryst. C 64(12) (2008) m387-m389
Abstract
The title compound, [Co(C18H23N10)](BF4)2·H2O, is the result of complexing a Co cation (initially in a CoII state) with tris[2-(1H-imidazol-2-ylmethyleneamino)ethyl]amine (L), obtained by a condensation process involving imidazole-2-carbaldehyde and tris(2-aminoethyl)amine. Both the Co cation and the ligand were modified in the synthesis process, the cation via oxidation to CoIII, and the ligand via deprotonation to convert it into the 2-(2-{bis[2-(1H-imidazol-2-ylmethyleneamino)ethyl]amino}ethyliminomethyl)imidazolide anion (L-). The ligand chelates the metal centre in a hexadentate fashion, forming a slightly distorted octahedral CoN6 chromophore. Packing is governed by N–HN hydrogen bonds defining zigzag chains. A similar structure in the literature is discussed, and the wrong assignment of the oxidation state, given therein to the Co cation, is corrected.
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