KSbI6O18: An antimony iodate semiconductor material with cyclic chiral S6-symmetric hexaiodate.

The antimony iodate KSbI 6 O 18 which contains cyclic S 6 -symmetric chiral hexaiodate has been successfully synthesized through hydrothermal reaction. It crystallizes in trigonal space group R-3 with cell parameters of a = 11.3057(6) Å, c = 11.3340(8) Å, γ = 120° and z = 3. Six corner-shared IO 4 groups form cyclic S 6 -symmetric chiral I 6 O 18 groups that are linked by Sb 5 + to form anionic [Sb(I 6 O 18 )] − framework with cavities filled by K + ions. Optical diffuse reflectance spectra indicate that KSbI 6 O 18 is a potential semiconductor with optical band gap of 2.96 eV. [ABSTRACT FROM AUTHOR]