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Serendipitous formation and characterization of K₂[Pd(NO₃)₄]·2HNO₃
- Zoller, Michael, Bruns, Jörn, Heymann, Gunter, Wurst, Klaus, Huppertz, Hubert
- Zeitschrift für Naturforschung 2019 v.74 no.4 pp. 381-387
- X-ray diffraction, anions, cations, crystal structure, crystallization, glass, nitrates, nitric acid, palladium, potassium
- A potassium tetranitratopalladate(II) with the composition K₂[Pd(NO₃)₄] · 2HNO₃ was synthesized by a simple solvothermal process in a glass ampoule. The new compound crystallizes in the monoclinic space group P2₁/c (no. 14) with the lattice parameters a = 1017.15(4), b = 892.94(3), c = 880.55(3) Å, and β = 98.13(1)° (Z = 2). The crystal structure of K₂[Pd(NO₃)₄] · 2HNO₃ reveals isolated complex [Pd(NO₃)₄]²⁻ anions, which are surrounded by eight potassium cations and four HNO₃ molecules. The complex anions and the cations are associated in layers which are separated by HNO₃ molecules. K₂[Pd(NO₃)₄] · 2HNO₃ can thus be regarded as a HNO₃ intercalation variant of β-K₂[Pd(NO₃)₄]. The characterization is based on single-crystal X-ray and powder X-ray diffraction.