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crystal data
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, Dm = 2.87 (4), Dx = 2.912 Mg m-3 for the Ni compound, and a = 9.704 (2), c = 19.388 (4) Å, Dm = 3.12 (4), Dx = 3.115 Mg m-3 for the Pd compound. X-ray powder data are given.