Spectral titration identifies a 1:3 complex of plutonium(VI) with oxalate, indicating its significance in aqueous chemistry.
The complexation of Pu(VI) with oxalate (L²⁻) in aqueous solution is scrutinized with an absorption spectral titration. The previously neglected 1:3 complex of PuO₂L₃⁴⁻ is identified, and the stability constants of the three successive complexes (PuO₂L(aq), PuO₂L₂²⁻, and PuO₂L₃⁴⁻) are calibrated to be 5.23 ± 0.04, 9.21 ± 0.08, and 10.61 ± 0.12, respectively.
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Yang et al. (2026) studied this question.
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