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Adams' catalyst is prepared from chloroplatinic acid H 2 PtCl 6 or ammonium chloroplatinate, (NH 4) 2 PtCl 6, by fusion with sodium nitrate. The first published preparation was reported by V. Voorhees and Roger Adams. [2] The procedure involves first preparing a platinum nitrate which is then heated to expel nitrogen oxides. [3]
When heated to 150–180 °C, it decomposes with autooxidation to plutonium (VI) with the formation of plutonyl nitrate (PuO 2 (NO 3) 2).Upon evaporation of concentrated nitric acid solutions of plutonium nitrate and alkali metal nitrates, double nitrates of the composition M 2 [Pu(NO 3) 6] are formed, where M = Cs +, Rb +, K +, Tl +, NH 4 +, analogous to ceric ammonium nitrate.
An aqueous solution of rhodium chloride, chloroplatinic acid, and sodium nitrate is evaporated and then fused in a porcelain dish between 460-480°C until the oxides of nitrogen cease (≈10 minutes).
The title complex is one of several platinum ammine complexes. Hexaammineplatinum(IV) chloride; Trichlorotriammineplatinum(IV) chloride [2] cis-Tetrachlorodiammineplatinum(IV) [3] trans-Tetrachlorodiammineplatinum(IV) (RN 16986-23-5) [3]
The complex is so poorly soluble that this step is employed in the isolation of platinum from ores and recycled residues. [3] As analyzed by X-ray crystallography, the salt crystallizes in a cubic motif reminiscent of the fluorite structure. The [PtCl 6] 2− centers are octahedral. The NH 4 + centers are hydrogen bonded to the chloride ligands ...
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Plutonium(IV) iodate is an inorganic compound with the chemical formula Pu(IO 3) 4, it is a salt which decomposes into plutonium(IV) oxide above 540 °C. [3] It can be generated in the reaction of plutonium(IV) nitrate and iodic acid, but this method cannot obtain a pure product; [3] Another preparation method is the reaction of plutonium(IV) nitrate or plutonium(IV) chloride with potassium ...
Sodium hexachloroplatinate(IV), the sodium salt of chloroplatinic acid, is an inorganic compound with the formula Na 2 [PtCl 6], consisting of the sodium cation and the hexachloroplatinate anion. As explained by Cox and Peters, anhydrous sodium hexachloroplatinate, which is yellow, tends to form the orange hexahydrate upon storage in humid air.
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