Hydroxoplatinate(IV) von Calcium,Strontium und Barium

Hydroxoplatinates(IV) of Calcium, Strontium, and Barium CaPt(OH)₆, CaPtO₂(OH)₂, SrPt(OH)₆ · 2 H₂O, and BaPt(OH)₆ were prepared by precipitation from alkali hydroxoplatinate(IV) solution with earth alkali salt solutions, and characterized by X-ray diffraction and chemical analysis. The crystal structure of CaPt(OH)₆, space group P3 1c-;D, with isolated octahedral Pt(OH)₆ ions, was determined by X-ray powder data. Probable hydrogen positions are calculated, and hydrogen bonding is discussed.