Fluorinated tertiary alkoxides of some lanthanides: tris-trifluorotertiarybutoxides of lanthanum, praseodymium and europium

Abstract

From reactions involving M{N(SiMe 3) 2} 3 (M = La, Pr and Eu) and triflurotertiary butano[(CF 3)Me 2COH; tftb.H], the compounds [La(tftb) 3(thf) 1.5] ( 1), [Pr(tftb) 3 ( 2) and [Eu(tftb) 3] ( 3) have been isolated. From variable temperature 1H and 19F NMR studies it is suggested that 1 is a mixture of [La 3(tftb) 9(thf) 2] ( 1a) and [La 2(tftb) 6(thf) 4] ( 1b). X-ray crystallography has shown that 2 is the trimer [Pr 3(tftb) 9] and variable temperature 1H and 19F NMR suggests that 3 is also a trimer, [Eu 3(tftb) 9].