Novel Thioborates of Cesium: Cs3BS3 and Li2CsBS3

The new compounds Li2CsBS3 and Cs3BS3 were prepared from the metal sulfide(s), amorphous boron and sulfur in solid state reactions at high temperatures. The crystal structures were determined by single crystal X-ray diffraction experiments. The purity of the products was proved by powder diffraction. Li2CsBS3 crystallizes in the orthorhombic space group Pnma (no. 62) with a = 10.004(2), b = 8.000(2), c = 8.082(2) Å , and Z = 4, while Cs3BS3 is isotypic to Rb3BS3 in the monoclinic space group P21/c (no. 14) with a = 10.397(1), b = 6.660(1), c = 13.618(1) Å , β = 101.31(1) °, and Z = 4. Both compounds contain isolated [BS3]3− anions with boron in a trigonal-planar coordination.