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Chemphyschem. 2010 Mar 15;11(4):865-9. doi: 10.1002/cphc.200900910.

How far can we go? Quantum-chemical investigations of oxidation state +IX.

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  • 1Institut für Anorganische und Analytische Chemie, Albert-Ludwigs Universität Freiburg, Albertstrasse 21, D-79104 Freiburg i. Br., Germany.

Abstract

The highest known oxidation state of any element is +VIII. After the recent discovery of Ir(VIII)O(4) under cryogenic conditions, we have investigated the stability of cationic species [MO(4)](+) (M=Rh,Ir,Mt). Such compounds would formally represent the new oxidation state +IX, which is experimentally unknown so far for the whole periodic table. [IrO(4)](+) is predicted to be the most promising candidate. The calculated spin-orbit (SO) coupling shows only minor effects on the stability of the iridium species, whereas SO-coupling increases enormously for the corresponding Eka-Iridium (Meitnerium) complexes and destabilizes these.

PMID:
20127784
[PubMed]
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