Transparent single crystals of a new iodate Cs5[Sc2(IO3)9](IO3)2 were synthesized under mild hydrothermal conditions. X-ray diffraction crystal was used to determine the large structure with 52 independent atoms, sp. gr. P21/c. The building blocks [Sc(IO3)6]3− Sc octahedra and six (IO3) groups are condensed into framework; contains additional isolated groups. Large Cs cations occupy holes form ...