ORGANOMETALLIC COMPOUNDS OF THE LANTHANOI DS .3. SYNTHESIS AND CHARACTERIZATION OF CATIONIC METALLOCENE COMPLEXES OF THE LANTHANOIDES - X-RAY CRYSTAL-STRUCTURE OF [CP(2)(ASTERISK)YB(THF)(2)][BPH(4)]

Cationic organolanthanoide compounds [(C(5)H(4)R)(2)Sm(THF)(2)] [BPh(4 )] (R = (t)Bu (1), SiMe(3) (2)), [Pyr(2)Sm(THF)][BPh(4)] (3) (Pyr* = NC(4)H(2)(t)Bu(2)-2,5), [Cp(2)Ln-(THF)(2)][BPh(4)] (Cp* = C(4)Me(5); Ln = Y (4), Yb (5)), and [(C(5)Me(4)Et)(2)Ln(THF)(2)] [BPh(4)] (Ln = Y (6), Sm (7)) have been synthesized by oxidation of the divalent metal locenes [(C(5)H(4)R)(2)Sm(THF)(2)] (R = (t)Bu, SiMe(3)), [Pyr(2)Sm(TH F)], [Cp(2)(Y)b(THF)], and [(C(5)Me(4)Et)(2)Sm(THF)] with Ag[BPh(4)] a nd by protolysis of the lanthanoide alkyls [Cp(2)YMe(THF)], [Cp(2)*Yb CH(SiMe(3))(2)], and [(C(5)Me(4)Et)(2)LnCH(SiMe(3))(2)] (Ln = Y, Sm) b y [NEt(3)H][BPh(4)]. The H-1- and C-13-NMR spectra of the new compound s are discussed. 5 crystallizes in the space group P2(1)/c with a = 10 .604(7), b = 21.749(3), c = 19.124(4) Angstrom, beta = 96.47(4)degrees , Z = 4 and V = 4383(3) Angstrom(3) (R = 0.0291 for 8517 observed refl ections with F-o greater than or equal to 4 sigma (F-o).