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Chalcogenides

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Oxygenated salts

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Neodymium(III) sulfate can be directly obtained by dissolving neodymium(III) oxide in sulfuric acid.[1] It is soluble in water, and its anhydrous form has a solubility of 8 g at 20˚C. Neodymium(III) nitrate can be obtained by dissolving neodymium(III) oxide in nitric acid.[2] Evaporating the resulting solution yields hydrated neodymium(III) nitrate, where the hexahydrate form is the most common. Heating the hexahydrate further will obtain the anhydrous form. Reacting neodymium(III) chloride with sodium arsenate in solution would obtain neodymium(III) arsenate,[3] which is a faint pink powder that is insoluble in water. It has good thermal stability, and its pKsp,c is 21.86±0.11.[4] Neodymium(III) oxalate is a rose-coloured crystal which decomposes from its decahydrate to its anhydrous form when heated, and when heated further, decomposes to Nd2O2C2O4,[5] and then finally obtaining neodymium(III) oxide.[6] Neodymium(III) carbonate is the carbonate of neodymium where neodymium exhibits the +3 oxidation state. It can be obtained by reacting neodymium(III) chloride with ammonium bicarbonate in water or from the hydrolysis of neodymium(III) chloroacetate:[7]

2Nd(C2Cl3O2)3 + 3H2O → Nd2(CO3)3 + 6CHCl3 + 3CO2

Neodymium(III) acetate is a purple solid[8] that is soluble in water.[9][10] The solubility of the compound increases when sodium acetate is added, forming a blue complex.[11] It can be obtained by the reaction of neodymium(III) chloride and sodium acetate:[12]

NdCl3 + 3Na(CH3COO) → Nd(CH3COO)3 + 3NaCl
  1. ^ 《无机化合物制备手册》.朱文祥 主编. 化学工业出版社. P701. 【XVI-97】八水硫酸钕（neodymium sulfate octahydrate）
  2. ^ 《无机化学丛书》.第七卷 钪 稀土元素. P233. 11.硝酸盐及其复盐
  3. ^ Gabisoniya, Ts. D.; Nanobashvili, E. M.. Synthesis of rare earth metal arsenates. Soobshcheniya Akademii Nauk Gruzinskoi SSR (1980), 97(2), 345-8. ISSN:0002-3167
  4. ^ Firsching, F. Henry. Solubility products of the trivalent rare-earth arsenates. Journal of Chemical and Engineering Data, 1992. 37 (4): 497-499. DOI:10.1021/je00008a028
  5. ^ Gunther, Paul L.; Rehaag, Hildegard. The thermal decomposition of oxalates. I. The formation of peroxides by the thermal decomposition of oxalates in a vacuum. Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen. 1938. 71B: 1771-1777. ISSN: 0365-9488.
  6. ^ Wendlandt, W. W. (1959). "Thermal Decomposition of Rare Earth Metal Oxalates". Analytical Chemistry. 31 (3): 408–410. doi:10.1021/ac60147a024. ISSN 0003-2700.
  7. ^ 《无机化学丛书》. 第七卷 钪 稀土元素. 易宪武 黄春晖 等编.科学出版社. tr. 174, 碳酸盐.ISBN=978-7-03-030574-9
  8. ^ Sonia Gomez Torres, Gerd Meyer (2008). "Anhydrous Neodymium(III) Acetate". Zeitschrift für anorganische und allgemeine Chemie. 634 (2): 231–233. doi:10.1002/zaac.200700407. ISSN 1521-3749.
  9. ^ "American elements - Neodymium acetate".
  10. ^ Perry, Dale L. (2016). Handbook of Inorganic Compounds (in German). CRC Press. p. 480. ISBN 978-1-4398-1462-8.
  11. ^ Holliday, A. K.; Massey, A. G. (2013). Non-Aqueous Solvents in Inorganic Chemistry (in German). Elsevier Science. p. 75. ISBN 978-1-4831-5941-6.
  12. ^ Mehrotra, R. C.; Misra, T. N.; Misra, S. N. Organic compounds of lanthanide elements: preparation of carboxylic acid salts of praseodymium and neodymium. Journal of the Indian Chemical Society, 1966. 1: 61-62. ISSN:0019-4522
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