Crystal data for isotypic Cs₂[M(CN)₄]•H₂O compounds, M = Pt, Pd and Ni

Abstract

Cs₂[Pd(CN)₄]•H₂O and Cs₂[Ni(CN)₄]•H₂O were found to be isotypic with the known hexagonal Pt compound which shows an unusual helical chain of six [Pt(CN)₄]²⁻ groups in the unit cell, space group P6₁ or P6₅. The crystal data are a = 9.559(2) and c = 19.308(4) Å. D(m) = 2.87(4), D(x) = 2.912 Mg m⁻³ for the Ni compound, and a = 9.704(2), c = 19.388(4) Å, D(m) = 3.12(4), D(x) = 3.115 Mg m⁻³ for the Pd compound. X-ray powder data are given.