Synthesis and Crystal Structure of In(OH)(SeO₃)

In(OH)(SeO 3 ), prepared by a hydrothermal reaction, crystallizes in a new structure type containing cis InO 4 (OH) 2 octahedra. These groups share both corners ( via OH) and edges ( via O) to result in a layered motif containing octahedral 8‐ring holes that resembles a single layer of the hollandite structure. The selenium atoms [as pyramidal (SeO 3 ) 2− selenite groups] decorate the 8‐ring holes and crosslink the sheets, leading to a three‐dimensional structure. Crystal data: In(OH)(SeO 3 ), M r = 258.79, triclinic, P 1 (No. 2), a = 5.6523 (2) Å, b = 7.9598 (3) Å, c = 8.0911 (3) Å, α = 87.925 (2)°, β = 79.679 (2)°, γ = 83.201 (3)°, V = 355.58 (2) Å 3 , Z = 4, R ( F ) = 0.023, wR ( F 2 ) = 0.054.