Ternäre Varianten des Pyrit-Typs: Darstellung und Struktur von SrPt4P6, SrPt4As6, BaPt4As6 und BaPt2P3 / Ternary Pyrite-Type Derivatives: Preparation and Crystal Structure of SrPt4P6, SrPt4As6, BaPt4As6 and BaPt2P3

The isotypic compounds SrPt4P6 , SrPt4As6 and BaPt4As6 were found to crystallize with a Pyrite-type derivative structure (monoclinic, C2/c, Z = 4) in which one Sr or Ba atom per formula unit occupies the position of a P2 or As2 pair. BaPt2P3 forms another Pyrite-type related structure (monoclinic, P21/c, Z = 4) built up by Ba2Pt and Pt3P6 layers. All crystal structures were refined from four-circle diffractometer data, the lattice constants are: SrPt4P6: a = 825.2(1) pm, b = 798.4(1) pm, c = 1142.8(1) pm, β = 90.74(2)°; SrPt4As6: a = 858.2(1) pm, b = 832.1(1) pm, c = 1194.5(1) pm, β = 91.00(2)°; BaPt4As6: a = 868.8(1) pm, b = 833.3(1) pm, c = 1197.1(1) pm, β = 90.81(2)°; BaPt2P3 a = 835.2(1) pm, b = 577.6(1) pm, c = 1157.4(1) pm, β = 106.73(2)°.