Crystal structure of Pb3(IO4(OH)2)2.

The structure of the title compound, trilead(II) bis-[di-hydroxido-tetra-oxido-iodate(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 IO4(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 octa-hedral IO4(OH)2 (3-) anions are arranged in rows extending parallel to [021], forming a distorted hexa-gonal 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 inter-actions between the IO4(OH)2 octa-hedra, further consolidating the crystal packing.