Volatile fluorinated tertiary alkoxides of some lanthanides, tris-hexafluoro-tertiary butoxides of lanthanum, praseodymium and europium

Abstract From reactions involving M{N(SiMe 3 ) 2 } 3 (M = La, Pr, Eu) and hexafluoro-tert-butanol [(CF 3 ) 2 MeCOH, hftb.H) the following compounds have been isolated: [La(hftb) 3 ] n ( 1 ), [La(hftb) 3 (NH 3 )] n ( 2 ), [La 2 (hftb) 6 (NH 3 ) 4 ] ( 3 ), [La(hftb) 3 (Et 2 O) 0.33 ] n ( 4 ), [Pr(hftb) 3 ] n ( 5 ), [Pr 2 (hftb) 6 (NH 3 ) 4 ], ( 6 ), [Eu(hftb) 3 ] n ( 7 ) and [Eu 2 (hftb) 6 (NH 3 ) 2 ] ( 8 ). These compounds were characterized by elemental analyses and spectroscopic studies. The structure of [Pr 2 (hftb) 6 (NH 3 ) 4 ] ( 6 ) was determined by single-crystal X-ray diffraction. The molecule is a centrosymmetric dimer with the praseodymium atoms in a distorted octahedral configuration. The ammonia ligands are cis to each other, one is trans to a terminal hftb group and the other is trans to a bridging hftb group.