Identification of an iridium-containing compound with a formal oxidation state of IX

@article{Wang2014IdentificationOA,
  title={Identification of an iridium-containing compound with a formal oxidation state of IX},
  author={Guanjun Wang and Mingfei Zhou and James T. Goettel and Gary J. Schrobilgen and Jing Su and Jun Li and Tobias Schl{\"o}der and Sebastian Riedel},
  journal={Nature},
  year={2014},
  volume={514},
  pages={475-477}
}
One of the most important classifications in chemistry and within the periodic table is the concept of formal oxidation states. The preparation and characterization of compounds containing elements with unusual oxidation states is of great interest to chemists. The highest experimentally known formal oxidation state of any chemical element is at present VIII, although higher oxidation states have been postulated. Compounds with oxidation state VIII include several xenon compounds (for example… 

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