Abstract

AbstractThe cover picture shows the structure of the cation [ReO(cyclen‐H)I]+. This complex and the analogous [ReO(cyclen‐H)Cl]+ are the first examples of d transition metal oxo complexes anchored by a monoanionic cyclen ligand. The deprotonation of cyclen can be accounted by the enhanced Lewis acidity of the d2 rhenium center. Although the geometric contraints of cis‐octahedral cyclen could impose the cis‐ReO2 unit, the resulting cis‐dioxo complex, cis‐[ReO2(cyclen)]+, is very reactive, being readily converted into [ReO(cyclen‐H)X]+. Details are discussed in the article by I. Santos et al. on p. 243 ff.

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