Crystal structure of Pb₃(IO₄(OH)₂)₂

Abstract

The structure of the title compound, trilead(II) bis[dihydroxidotetraoxidoiodate(VII)], was determined from a crystal twinned by non-merohedry with two twin domains present [twin fraction 0.73 (1):0.27 (1)]. It contains three Pb 2+ cations and two IO 4 (OH) 2 3− anions in the asymmetric unit. Each of the Pb 2+ cations is surrounded by eight O atoms (cut-off value = 3.1 Å) in the form of a distorted polyhedron. The octahedral IO 4 (OH) 2 3− anions are arranged in rows extending parallel to [021], forming a distorted hexagonal rod packing. The cations and anions are linked into a framework structure. Although H-atom positions could not be located, O...O distances suggest medium-strength hydrogen-bonding interactions between the IO 4 (OH) 2 octahedra, further consolidating the crystal packing.