Complexation of uranium(VI) with aromatic acids such as hydroxamic and benzoic acid investigated by TRLFS


Complexation of uranium(VI) with aromatic acids such as hydroxamic and benzoic acid investigated by TRLFS

Glorius, M.; Moll, H.; Geipel, G.; Bernhard, G.

The complex formation of uranium(VI) with salicylhydroxamic, benzohydroxamic, and benzoic acid was investigated by time-resolved laser-induced fluorescence spectroscopy (TRLFS). We observed in all three systems a decrease in the fluorescence intensity with increasing ligand concentration. All identified complexed uranyl species are of the type MpLqHr. In the uranium(VI)-salicylhydroxamate system a 1:1 complex with a stability constant of log β111 = 17.34 ± 0.06 and a 1:2 complex with a stability constant of log β122 = 35.0 ± 0.11 was identified. Also in the uranium(VI)-benzohydroxamate system the stability constants are determined to be log β110 = 7.92 ± 0.11 and log β120 = 16.88 ± 0.49. In the uranium(VI)-benzoate system only a 1:1 complex is existent with a stability constant of log β110 = 3.56 ± 0.05.

Keywords: Uranyl; Hydroxamic acid; Spectroscopy; TRLFS; Complexation

  • Journal of Radioanalytical and Nuclear Chemistry 277(2008)2, 371-377

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Publ.-Id: 9610