As previously mentioned, the potassium cation in 2-Dy makes it difficult to fully assess the structural changes in comparison to other reported homoleptic Dy(III) heterocyclic compounds which do not contain such a bridging unit. We had, therefore, attempted to remove the K + ion using 18-crown-6, similar to the synthesis of 3-Tb. However, we observed the formation of the divalent species 4-Dy which is found to be a perfectly straight sandwich complex (Ct-Dy-Ct = 180°). It is noteworthy that the reports of divalent dysprosium compounds are rather scarce.