EPR Spectroscopy Of Transformations Of Iridium(III) And Iridium(IV) Hydroxo Complexes In Alkaline Media
EPR spectroscopy of transformations of iridium(III) and iridium(IV) hydroxo complexes in alkaline media. Pankratov D.A., Komozin P.N., Kiselev Yu.M. //Russian Journal of Inorganic Chemistry. 2011. V.56. №11. P.1794-1799.
Processes that occur in strong alkaline solutions of iridium(III) and iridium(IV) hydroxo complexes have been studied by EPR and electronic absorption spectroscopy. It has been demonstrated that dissolution of iridium compounds in alkaline solutions should be accompanied by a series of complicated transformations involving oxygen, which lead to the formation of several binuclear iridium(III, III), (III, IV), and (IV, IV) dioxygen complexes.
Most research into the chemistry of platinum metals has focused on their complexes. However, the chemistry of their hydroxo complexes is still one of the least studied fields. There are both objective (experimental complexity of operation in alkaline and strong alkaline media, tendency to polymerization of many hydroxo compounds, and others) and subjective reasons for this situation. In particular, it is believed that the chemistry of platinum metal hydroxo complexes is insufficiently diverse. Nevertheless, we previously showed the possibility of the existence of platinum(IV) hydroxo complexes as mono- and binuclear as mono- (superoxo-) and bi- (hydroxo- and superoxo-) bridging superoxo complexes of different composition forming under oxidative conditions in strong alkaline media.