کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1335017 | 1500224 | 2016 | 5 صفحه PDF | دانلود رایگان |
The eight coordinate complexes of 1,2-bis(dimethylarsino)benzene, MCl4(diars)2 where M is Th or U, and 1,2-bis(dimethylphosphino)benzene, UCl4(diphos)2, are prepared and characterized. Both coordination complexes of uranium crystallize in the tetragonal crystal system in space group I4¯2m, in which the geometry is a D2d-dodecahedron. In solution the uranium complexes do not exchange with added free ligand on the NMR time scale but they undergo bidentate ligand exchange on the chemical time scale. The 31P{1H} NMR chemical shifts of UI4(diphos)2 and UX4(dmpe)2, X = Cl, Br, I range from 1500 to 2100 ppm and are strongly dependent on temperature.
The eight coordinate complexes UCl4[(1,2-Me2E)C6H4]2 (E = As, P) have a dodecahedral geometry in the solid state and exchange their bidentate chelating ligands slowly in solution.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 116, 25 September 2016, Pages 122–126