Preparation and characterization of uranyl complexes with phosphonate ligands |
| |
Authors: | Z Hnatejko S Lis Z Stry?a |
| |
Institution: | (1) Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland;(2) Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland; |
| |
Abstract: | The preparation, spectroscopic characterization and thermal stability of neutral complexes of uranyl ion, UO2
2+, with phosphonate ligands, such as diphenylphosphonic acid (DPhP), diphenyl phosphate (DPhPO) and phenylphosphonic acid (PhP)
are described. The complexes were prepared by a reaction of hydrated uranyl nitrate with appropriate ligands in methanolic
solution. The ligands studied and their uranyl complexes were characterized using thermogravimetric and elemental analyses,
ESI-MS, IR and UV–Vis absorption and luminescence spectroscopy as well as luminescence lifetime measurements. Compositions
of the products obtained dependent on the ligands used: DPhP and DPhPO form UO2L2 type of complexes, whereas PhP forms UO2L complex. Based on TG and DTG curves a thermal stability of the complexes was determined. The complexes UO2PhP·2H2O and UO2(DPhPO)2 undergo one-step decomposition, while UO2PhP · 2H2O is decomposed in a two-step process. The thermal stability of anhydrous uranyl complexes increases in the series: DPhPO < PhP < DPhP.
Obtained IR spectra indicate bonding of P–OH groups with uranyl ion. The main fluorescence emission bands and the lifetimes
of these complexes were determined. The complex of DPhP shows a green uranyl luminescence, while the uranyl emission of the
UO2PhP and UO2(DPhPO)2 complexes is considerably weaker. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|