High Quality Content by WIKIPEDIA articles! Palladium(II) cyanides are chemical species with the empirical formula Pd(CN)n(2-n)-. The dicyanide (n = 2, CAS: [2035-66-7]) is a coordination polymer which was the first pure palladium compound isolated. In his attempts to produce pure platinum metal in 1804, W.H. Wollaston added mercuric cyanide to a solution of impure platinum metal in aqua regia to precipitate palladium cyanide which was then ignited to recover palladium metal - a new element. It likely that the structure of palladiumcyanide consists of square planar Pd(II) centers which are linked by bridging cyanide ligands, which are bonded through both the carbon and nitrogen atoms. The CN stretch is seen at 2222 cm-1, typical of bridging cyanide ions. The compound is rather insoluble in water with a solubility product of log Ksp = -42.

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