which solvent is use to dissolve the sodium lanthanide fluoride
( NaLnF4)?
If you want to extract pure salt of REE you can reflux LnF3 or MLnF4 with aqueous 10% NaOH, separate Ln(OH)3, dissolve it in mineral acid and repeat this to obtain fluoride-free salt. I do not think that there is a solvent in which this compound will dissolve without destruction. Perhaps melts of alkali metal fluorides or something like liquid ammonia.
Mr. Tashi,
In general, F-salts are among most stable forms. Try with MW.
I expect NaLnF4 to be soluble in high-boiling-point nonpolar solvents such as oleic acid (OA), oleylamine (OM), and 1-octadecene (ODE). This has to be confirmed by solubility tests in these solvents.
Actually I have synthesized the NaLnF4 sample.. I am looking for solvent to dissolved this...
A fluoride scavenger, such as boric acid (H3BO3), can be used in conjunction with HNO3 to obtain Ln nitrate solution. We use closed vessel microwave digestion to solubilize fluoride-bearing salt residues using HNO3 and a stoichiometric excess of H3BO3.
It is also noted that the resulting HBF4 can be removed from your sample by heating.
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