Abstract
The structure of the title compound, [CoCl(C 8 H 21 N 5 )]2ClO 4 , consists of octahedral [Co(trenenim)Cl] 2+ cations [where trenenim = N,N-bis(2-aminoethyl-N'-(2-aminoethylidene)ethane-1,2-diamine] with two perchlorate anions acting as counterions. The bond lengths and angles about N(2) and C(3) provide clear evidence for the presence of an imine bond. A short Co-N(2) distance of 1.863 (2) A reflects the fact that this N atom is an imine N atom. The corresponding Co-N distance in the related saturated system [Co(trenen)Cl] 2+ [where trenen = N,N,N'-tris-(2-aminoethyl)ethane-1,2-diamine] is also substantially shorter than the others. In both cases, the secondary N atom on the appended arm has a stronger affinity for Co III than the primary and tertiary N atoms within the ligand framework
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