Characterization and structural determination of a new sodium lanthanum phosphate thiosulfate, Na2La[PO4][S2O3]

Syntheses and Structures of the First Lanthanide–Thiosulfate Complexes and the Subsequent Formation of Mixed Thiosulfate–Sulfite Compounds

“…Interactions between hard lanthanide cations and relatively soft thiosulfate anions are hypothesized to yield noteworthy structures due to the incongruent nature of the two ions (on the basis of the Pearson definition of hard–soft acids and bases, HSAB). − The thiosulfate anions are known to form complex ions with a variety of metal cations, often with exceedingly high solubilities. However, there are little to no data on lanthanide thiosulfate compounds, with the exception of a lanthanum phosphate thiosulfate . Trial and error eventually led to the synthesis and subsequent crystallization of the first lanthanide thiosulfate compound with salts of lanthanide­(III) chloride and potassium thiosulfate.…”

“…However, there are little to no data on lanthanide thiosulfate compounds, with the exception of a lanthanum phosphate thiosulfate. 37 Trial and error eventually led to the synthesis and subsequent crystallization of the first lanthanide thiosulfate compound with salts of lanthanide(III) chloride and potassium thiosulfate. Unbeknownst to the authors, the potassium chloride ion pair within the structure itself is the lynchpin for the crystallization of this elusive, ostensibly highly soluble compound.…”

“…Herein we will present a series of the first lanthanide thiosulfate and lanthanide mixed thiosulfate−sulfite structures. Apart from a lanthanum mixed phosphate−thiosulfate created with sodium monothiophosphate in a Na 2 S 4 flux, 37 these are the first lanthanide thiosulfate compounds to be synthesized. The compounds presented herein grant insights into the intricate fundamental interactions that occur between soft thiosulfate anions and hard lanthanide cations.…”