Complex Formation between Uranium(VI) and alpha-D-Glucose 1-phosphate

The complex formation of uranium(VI) with alpha-D-glucose 1-phosphate (C₆H₁₁O₆PO₃ ^2-, G1P) was determined by time-resolved laser-induced fluorescence spectroscopy (TRLFS) at pH 4 and potentiometric titration in the pH range from 3 to 10. Both measurements show the formation of a 1:1 complex at lower pH values. The formation constant of UO₂(C₆H₁₁O₆PO₃) was calculated from TRLFS measurements to be log beta₁₁ = 5.72 ± 0.12, and from potentiometric titration log beta₁₁ = 5.40 ± 0.25, respectively.
It was found by potentiometric titration that at higher pH values the complexation changes to a 1:2 complex. The stability constant for this complex was calculated to be log beta₁₂ = 8.96 ± 0.18.