Uranium(VI) Sulfilimine Complexes: A New Class of Nitrogen Analogues of the Uranyl Ion
作者:V. Cliff Williams、Matthias Müller、Michael A. Leech、Robert G. Denning、Malcolm L. H. Green
DOI:10.1021/ic991294w
日期:2000.6.1
The compound tetraphenylphosphonium tetrachlorooxo-S,S-diphenylsulfiliminatour [Ph4P][UOCl4(NSPh2)], has been prepared in high yield from [Ph4P][UOCI5] and [Ph2S=NSiMe3]. An X-ray structure of this compound shows that the uranium atom has a pseudooctahedral geometry with oxygen and nitrogen atoms in trans positions. The structure of the analogous phosphoriminato complex [Ph4P][UOCl4(NPPh3)] has been determined for comparison. Derivatization of the sulfide group shows that only a limited range of functionalization confers stability toward reduction. The emission spectrum of the first electronic excited state reveals a greatly reduced energy compared with that of the uranyl ion. This red shift in the transition is consistent with the weakening of the U-N bond relative to the U-O bond.
Uranium−Sulfilimine Chemistry: Synthesis and Characterization of Cp*<sub>2</sub>UCl(NSPh<sub>2</sub>) and Cp*<sub>2</sub>U(NSPh<sub>2</sub>)<sub>2</sub>
作者:Kanahara A. N. S. Ariyaratne、Roger E. Cramer、John W. Gilje
DOI:10.1021/om020678i
日期:2002.12.1
Two imido derivatives of U(IV), CP*2UCl(NSPh2) (1; Cp* = pentamethylcyclopentadienyl) and CP*U-2(NSPh2)(2) (2), have been prepared in high yield from CP*2UCl2 and LiNSPh2. Alternatively, 1 and 2 can be synthesized by treating CP*2UCl[(CH2)(2)PPh2] with anhydrous HNSPh2. CP*U-2(NSPh2)(2) is the first structurally characterized uranium bis(sulfilimide) complex. Its short U-N distance suggests significant uranium-imido multiple-bond character.