Raman spectral studies of uranyl sulphate and its urea complex structural isomers

✍ Scribed by Eric Faulques; Richard E. Russo; Dale L. Perry

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 675 KB
• Volume: 49
• Category: Article
• ISSN: 1386-1425
• DOI: 10.1016/0584-8539(93)80216-w

✦ Synopsis

Abstr@-Using Raman spectroscopy, the authors have studied two forms of the dioxouranium(V1) sulphate complexes of the urea molecule, the bis(urea)dioxouranium(VI) sulphates a-and ~-UO#O,~2CO(NH,~. Raman spectra were recorded using the L = 488 and 647.1 nm laser excitation lines. For rl = 488 nm, the crystals exhibit strong, structured luminescence, with peaks separated by 857 cm-' (a-form) and 853 cm-' (/?-form). For rl = 647.1 nm, very intense Raman spectra are obtained which are similar but slightly different and can be used to distinguish each form. A comparison with the urea and uranyl sulphate hydrate (USH) spectra has clarified the Raman band assignment of the two parent a-and /%forms. Contributions of the urea donor ligand and the sulphate have been identified. Charge transfer to uranium and the uranium-oxygen force constant in the uranyl ion have been evaluated. The results agree with previous X-ray structural investigations.