Synthesis and crystal structure of the new quaternary thiophosphate KPbPS4

The new lead potassium thiophosphate KPbPS4 was synthesized by reacting Pb with an in situ formed melt of K2S3, P2S5 and S. Its structure was determined by single crystal X-ray diffraction. KPbPS4 crystallizes as yellow crystals in the orthorhombic system, space group Pnma (no. 62), a=17.045(3) Åa=17.045(3) Å, b=6.660(1) Åb=6.660(1) Å, c=6.473(1) Åc=6.473(1) Å, V=734.9(3) Å3V=734.9(3) Å3, Z=4Z=4. The structure is isotypic with that of KEuPS4 and consists of two-dimensional [PbPS4]nn− anionic layers extending in the yz plane, separated by alkali cations. The layers are comprised of alternating zigzag parallel chains of PbS6 trigonal prisms running along [010] connected by PS4 tetrahedral units.

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