How to prepare anhydrous salt of LnCl3. xH2O?

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Andreas Orthaber

Just a guess, but I think treatment with xs. (COCl)2 and subsequent removal of all volatiles under reduced pressure should work.

László Kótai

Dear Vasantha

The easiest way (e.g. for LaCl3) is the dehydration by heat in N2-HCl stream in order to avoid of LaOCl formation. Without HCl really LaOCl is formed, but in the presence of HCl not. . The exact process is given in "Brauer: Handbuch der Preparativen Anorganische Chemie, p. 846-847). The other ways are: reaction of NH4Cl and LnCl3.xH2O and reaction of La2O3 with NH4Cl, or La2O3 reaction with Cl2-S2Cl2 mixt.

If you want to do any of these you can find them in the book mentioned, if you cannot get it, do not hesitate to contact with me I will send you the pdf of the pages.