Abstract
The photodecomposition of the two title compounds has been carried out at 254 nm, and a single decarboxylation of the ligand was observed in each case. The decarboxylated complexes that resulted were characterized by visible and infrared spectroscopy, and it was concluded that uranium(IV) products were produced as a result of the reaction. The quantum yield of the ethylenediaminetetraacetic acid (EDTA) complex was found to be 0.84 ± 0.02, and the quatum yield of the diethylenetriaminepentaacetic acid (DTPA) was 0.50 + 0.01. The photoproducts could be isolated free from starting material or secondary photoproducts, since these other materials were not water-soluble. When the photoproduct was obtained in solid form, however, it formed as a plastic-like material, and this observation suggested polymerization of the uranium(IV) complexes due to radical reactions that occurred during the photolysis process.
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