The structures of binary metal sulphides

All metal sulphides are solid at ordinary temperatures, and we are therefore concerned here only with their crystal structures. These compounds may be divided into three groups, the sulphides of 

GeS2 (3D framework of GeS4 groups sharing all vertices) 

Type of structure Coordination numbers o/M and S Name of structure Exampies 

Layer structures 6 3 Cadmium iodide (C 6) Cadmium chloride (C19) TiS2, ZrS2, SnS2, PtS2, TaS2, HfS2 TaS2 

The coordination numbers here are those of Fe by S and of S2 groups by Fe or other metal. 

---