Hydrolysis and Complex Formation of Cerium(IV) with Dioxysuccinic Acid in Sulfate Solutions

Sodium Cerium Phosphate, (Na,Ce)2Ce(PO4)2 ⋅ xH2O, with Mixed Cerium Oxidation States

“…It is probably due to the oxidation of water by Ce(IV) in the initial ceric phosphate solution. This solution is of an extremely acidic nature and it is well known that Ce(IV) is a rather strong oxidising agent ( E °(Ce 4+ /Ce 3+ )=+1.3…+1.7 V) and thus it can easily oxidise water ( E °(O 2 /H 2 O)=1.23 V, pH=0) [72–75] . On the other hand, the Ce(OH)PO 4 synthesised using a similar method contained no detectable traces of Ce(III) (see Figure 4).…”

“…This solution is of an extremely acidic nature and it is well known that Ce(IV) is a rather strong oxidising agent (E°(Ce 4 + /Ce 3 + ) = + 1.3… + 1.7 V) and thus it can easily oxidise water (E°(O 2 /H 2 O) = 1.23 V, pH = 0). [72][73][74][75] On the other hand, the Ce(OH)PO 4 synthesised using a similar method contained no detectable traces of Ce(III) (see Figure 4). Nevertheless, the exact reasons for the formation of the cerous species from the ceric phosphate solutions requires further studies.…”