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|Section2= |Section3= |Section7= |Section8= }} Praseodymium(III) chloride is the inorganic compound with the formula PrCl3. It is a blue-green solid that rapidly absorbs water on exposure to moist air to form a light green heptahydrate. ==Preparation== Praseodymium(III) chloride is prepared by treating praseodymium metal and hydrogen chloride:〔〔L. F. Druding, J. D. Corbett, "Lower Oxidation States of the Lanthanides. Neodymium(II) Chloride and Iodide", ''J. Am. Chem. Soc.'' 83, 2462 (1961); J. D. Corbett, ''Rev. Chim. Minerale'' 10, 239 (1973),〕 :2 Pr + 6 HCl → 2 PrCl3 + 3 H2 It is usually purified by vacuum sublimation.〔 Hydrated salts of praseodymium(III) chloride can be prepared by treatment of either praseodymium metal or praseodymium(III) carbonate with hydrochloric acid: :Pr2(CO3)3 + 6 HCl + 15 H2O → 2 ()Cl3 + 3 CO2 PrCl3∙7H2O is a hygroscopic substance, that will not crystallise from the mother liquor unless it is left to dry in a dessiccator. Anhydrous PrCl3 can be made by thermal dehydration of the hydrate at 400 °C in the presence of ammonium chloride.〔〔M. D. Taylor, P. C. Carter, "Preparation of anhydrous lanthanide halides, especially iodides", ''J. Inorg. Nucl. Chem.'', 24, 387 (1962); J. Kutscher, A. Schneider, ''Inorg. Nucl. Chem. Lett.'', 7, 815 (1971).〕 Alternatively the hydrate can be dehydrated using thionyl chloride.〔〔J. H. Freeman, M. L. Smith, "The preparation of anhydrous inorganic chlorides by dehydration with thionyl chlorid", ''J. Inorg. Nucl. Chem.'', 7, 224 (1958).〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Praseodymium(III) chloride」の詳細全文を読む スポンサード リンク
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