Zur Kristallchemie der Oxoplatinate

On the Crystal Chemistry of Oxoplatinates Referring to the coordination of Pt²⁺ and Pt⁴⁺ by oxygen the crystal structures of oxoplatinates will be systemized. Pt²⁺ exclusively shows in solids a square and planar coordination well known and typical for Cu²⁺, Pd²⁺ and Ni²⁺ too. Often mixed valences (Pt²⁺/Pt⁴⁺) are observed in square planar oxygen surrounding. Some exceptionally rare coordination is the dumbbell like O—Pt²⁺—O. The crystal chemistry of Pt⁴⁺ resembles the countless metal ions showing octahedral coordination by oxygen. Despite different compositions the compounds BaLn₂PtO₅, Ba₃Cu₂Ln₂PtO₁₀, Ba₅Ln₈Zn₄O₂₁, Ba₁₃Ln₈Zn₄Pt₄O₃₇ and Ba₁₇Ln₁₆Zn₈Pt₄O₅₇ show amazing relationships of polyhedra connections. Additionally will be shown that Ba₄Sm₄Zn₃PtO₁₅ is isotypic to Ba₆Nd₂Al₄O₁₅ and Ba₄NaCu_{0, 5}Pt_{1, 5}O₈ to Ba₁₅Pt₆O₂₇. Oxoplatinates containing lone pair active elements show one side open polyhedra. The positions of the free (s²) electrons are calculated using the Coulomb terms of lattice energy.