Bi2O(XO4)(IO3)2 (XÂ =Â S, Se, Cr): Three-dimensional frameworks containing [Bi4O2]8+ clusters

The isostructural Bi2O(XO4)(IO3)2 (X = S, Se, Cr) exhibit three-dimensional framework structures that are composed of [Bi4O2]8+ tetrameric clusters, [IO3]− trigonal pyramids, and [XO4]2− (X = S, Se, Cr) tetrahedra. The [Bi4O2]8+ clusters are connected with each other via [XO4]2− groups to form [Bi4O2(XO4)2]4+ (X = S, Se, Cr) chains viewed down the [001] direction, and these chains are linked through [IO3]− groups to form three-dimensional framework structures.266