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The synthesis and physical properties of two new and one known Ir-Sn-Secompound are reported. Their crystal structures are elucidated withtransmission electron microscopy and powder X-ray diffraction. IrSn0.45Se1.55is a pyrite phase which consists of tilted corner-sharing IrX6 octahedra withrandomly distributed (Sn-Se)4- and (Se-Se)2- dimers. Ir2Sn3Se3 is a trigonallydistorted skutterudite that consists of cooperatively tilted corner-sharingIrSn3Se3 octahedra with ordered (Sn-Se)24- tetramers. Ir2SnSe5 is a layered,distorted \b{eta}-MnO2 (pyrolusite) structure consisting of a double IrSe6octrahedral row, corner-sharing in the a direction and edge-sharing in the bdirection. This distorted pyrolusite contains (Se-Se)2- dimers, Se2- anions,and each double row is "capped" with a (Sn-Se)n polymeric chain. Resistivity,specific heat, and magnetization measurements show that all three haveinsulating and diamagnetic behavior, indicative of low spin 5d6 Ir3+.Electronic structure calculations on Ir2Sn3Se3 show a single, spherical,non-spin-orbit split valence band, and suggest that Ir2Sn3Se3 is topologicallynon-trivial under tensile strain, due to inversion of Ir-d and Se-p states.

Anion-Anion Bonding and the Topology in Ternary Iridium Seleno-Stannides