Abstract
Noble metal halide compounds are an exciting class of materials which display unique crystal chemistry with temperature and pressure. Here we report two new compounds, single-valence formamidinium platinum iodide [(FA)2PtIVI6] and mixed-valence methylammonium gold iodide [(MA)2AuIAuIIII6]. Structural changes between 300K and 100K have been monitored. The compounds crystallize in two different perovskite-related structure classes, with the added complexity of a disordered, “tumbling”, organic cation at 300K. This tumbling is significantly reduced at 100K. (FA)2PtIVI6 undergoes in-phase octahedral tilting similar to related vacancy-ordered perovskite materials. At 100K, (MA)2AuIAuIIII6 undergoes a transition which facilitates stronger Au–I covalent bonding as made evident by a contraction of the unit cell and distances between Au and I atoms in the ab plane.
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