Preparation of Anhydrous Lanthanon Halides.
Preparation of Anhydrous Lanthanon Halides.
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DOI：
10.1021/cr60220a001
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发表时间：
1962-12
期刊：
影响因子：
62.1
通讯作者：
M. Taylor
中科院分区：
文献类型：
--
作者：
M. Taylor
一般元素，特别是镧系元素的最重要的化合物是无水卤化物，尤其是氯化物。氯化物广泛用于电解和金属热法生产金属。它们是制备许多其他无水化合物，特别是二价镧系化合物的原料。通常，无水氯化物用于研究镧系元素的热化学性质和研究它们在非水溶液中的反应。尽管自本世纪初以来，大多数制备无水卤化镧的方法已经为人所知，但研究人员在制备纯形式的这些化合物方面仍然遇到困难（28,74）。此外，一些研究者似乎不知道一些最早的方法的存在（74）。制备卤化镧的纯水溶液很容易。从这些溶液中分离出来的卤化镧在除去未结合的水后通常会保留6到7摩尔的水。在100℃以下，大部分水可以通过仔细脱水除去，但很难除去最后一摩尔的水而不使卤化物在一定程度上分解。通常情况下，我们会准备无水的
Among the most important compounds of elements in general and lanthanons in particular are the anhydrous halides, especially the chlorides. The chlorides are used widely for the production of metals both by elec-trolytic and metallothermic methods. They are the starting materials from which many other anhydrous compounds, especially the divalent lanthanon com-pounds, are prepared. Normally, anhydrouschlorides are used for studying thermochemical properties ofthe lanthanons and for studying their reactions in non-aqueous solutions. Although most of the methods for preparing the anhydrous lanthanon halides havebeen known since the beginning of this century, investigators still experience difficulty in preparing these com-pounds in pure form (28, 74). Also some investigators appear not to know of the existence of some of the earliest methods (74).Pure aqueous solutions of lanthanon halides are prepared readily. The lanthanon halides which separate from these solutions usually retain 6 to 7 moles of water after the unbound water has been removed. Most of the water can be removed by careful dehydration below 100 but it is difficult to remove the last mole of water without decomposing the halide to some extent. Normally, one would expect to prepare anhydrous