KIrO and KIrO, Low-Dimensional Iridates with Infinite IrO Chains.

A previously unreported 1D iridate, KIrO, has been grown by a flux method in O-rich environment, and its crystal structure was determined via single crystal structural analysis. It exhibits straight chains of face-sharing [IrO] octahedra, which are arranged along the crystallographic axis, separated by nonmagnetic K ions. No magnetic transitions are observed during measured range, and the material is electrically insulating. Potentially interesting electronic behavior for KIrO is supported by electronic structure calculations. A structurally related material, KIrO, which displays similar fundamental geometric units but in a different spatial arrangement-zigzag chains-based on edge and face sharing [IrO] octahedra, is also reported. Both materials are of interest for probing the properties of a 1D system with strong spin-orbit coupling.