Revising the Highest Oxidation States of the 5d Elements: The Case of Iridium(+VII)

摘要

The quest for the highest achievable oxidation states of the transition-metal elements is of fundamental interest, not least because complexes in very high oxidation states may serve as oxidation agents.[1]-[3] The maximum oxidation states for the early transition metals follow the group number up to Group 8 (that is, [OsO4] and [RuO4], the lack of evidence for an existence of [FeO4] marks the exception). The trends for the later transition metals tend to be less clear-cut (see Figure 1 in Ref. [4]). In the 5d series, the trend of the experimentally suggested maximum oxidation states appears to be irregular (see filled circles and dotted line in Figure 1).