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Issue 47, 2015
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New honeycomb iridium(V) oxides: NaIrO3 and Sr3CaIr2O9

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We report the structures and physical properties of two new iridates, NaIrO3 and Sr3CaIr2O9, both of which contain continuous two-dimensional honeycomb connectivity. NaIrO3 is produced by room temperature oxidative deintercalation of sodium from Na2IrO3, and contains edge-sharing IrO6 octahedra that form a planar honeycomb lattice. Sr3CaIr2O9, produced via conventional solid-state synthesis, hosts a buckled honeycomb lattice with novel corner-sharing connectivity between IrO6 octahedra. Both of these new compounds are comprised of Ir5+ (5d4) and exhibit negligible magnetic susceptibility. They are thus platforms to investigate the origin of the nonmagnetic behavior exhibited by Ir5+ oxides, and provide the first examples of a J = 0 state on a honeycomb lattice.

Graphical abstract: New honeycomb iridium(v) oxides: NaIrO3 and Sr3CaIr2O9

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The article was received on 18 Aug 2015, accepted on 13 Oct 2015 and first published on 13 Oct 2015

Article type: Paper
DOI: 10.1039/C5DT03188E
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Citation: Dalton Trans., 2015,44, 20344-20351
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    New honeycomb iridium(V) oxides: NaIrO3 and Sr3CaIr2O9

    D. C. Wallace and T. M. McQueen, Dalton Trans., 2015, 44, 20344
    DOI: 10.1039/C5DT03188E

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