Uranyl complexes with (Hexamethyldisilyl)amido and nonafluoro-tert-butoxo ligands

Reaction of sodium nonafluoro-tert-butoxide with dinitratodioxouranium(VI)-bis (tetrahydrofuran), yields the diamagnetic perfluoroalkoxide UO2[OC(CF3)3]2 2HF. This complex is soluble in chlorinated hydrocarbons or ethers but is insoluble in aliphatic or aromatic hydrocarbons. The complex is not volatile and decomposes when heated to 1300C under vacuum. The asymmetric UO2 stretching frequency occurs at 928 cm-1. The IR and 1NHMR spectra were measured. The trans arrangement appears to be dominant. Reaction of sodium (hexamethyldidilyl)amide with uranyl chloride in THF yields the diamagnetic, orange-red amide UO2[N(SiMe3)2]. 2 THF. The complex is soluble in pentane though it does not sublime nor yield a molecular ion in the mass spectrometer. In the IR spectrum, a strong shoulder at 955 cm-1 on the asymmetric NSi2 vibration (935 cm-1) can be tentatively ascribed to the UO2 molecular vibration. The 1HNMR spectrum is invariant to -650C