title: The formal oxidation states of iridium now run from -III to +IX.
authors.affiliation: Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Helsinki (Finland). Pekka.Pyykko@helsinki.fi.
authors.forename: Pekka
authors.initials: P
authors.lastname: Pyykkö
authors.forename: Wen-Hua
authors.initials: WH
authors.lastname: Xu
keywords: IR spectroscopy; ab initio calculations; mass spectrometry; oxidation states