907570-65-4Relevant academic research and scientific papers
Synthesis and reactivity of uranium(iv) amide complexes supported by a triamidotriazacyclononane ligand
Antunes, Maria Augusta,Dias, Marta,Monteiro, Bernardo,Domingos, Angela,Santos, Isabel C.,Marques, Noemia
, p. 3368 - 3374 (2007/10/03)
Reaction of [U{(SiMe2NPh)3-tacn}Cl] with LiNEt 2 or LiNPh2 affords the corresponding amide compounds, [U{(SiMe2NPh)3-tacn}(NR2)] (R = Et (1), R = Ph (2)). The complexes have been fully characterized by spectroscopic methods and the solid-state structure of 1 was determined by single-crystal X-ray diffraction analysis. The six nitrogen atoms of the tris(dimethylsilylanilide)triazacyclononane ligand are in a trigonal prismatic configuration with the nitrogen atom of the diethylamide ligand capping one of the trigonal faces of the trigonal prism. Crystallization of 2 from CH 3CN solution gave crystals of the six-membered heterocycle [U{(SiMe2NPh)3-tacn}{κ2-(HNC(Me)) 2CCN}] (3). The reactivity of the amides was investigated. Both compounds undergo acid-base reactions with protic substrates such as HOC 6H2-2,4,6-Me3, 3,5-Me2pzH (pz = pyrazolyl) and HSC5H4N to give the corresponding [U{(SiMe2NPh)3-tacn}X] (X = OC6H 2-2,4,6-Me3 (4), 3,5-Me2pzH (5), κ 2-SC5H4N (6)) complexes. The solid-state structures of 3 and 6 were determined by single-crystal X-ray diffraction and revealed that the compounds are eight-coordinate with dodecahedral geometry. The Royal Society of Chemistry 2006.
