title: Synthesis and structures of the first cationic perfluoroaryllanthanoid(II) complexes.
abstract: Tetraphenylborate salts of solvated pentafluorophenyllanthanoid(II) cations [Ln(C(6)F(5))(thf)(n)](+) (Ln=Eu, n=6 (1); Ln=Yb, n=5 (2)) were readily synthesized in high yield by reactions of ytterbium or europium with HgPh(C(6)F(5)) and Me(3)NHBPh(4) in THF. The structures of 1.THF and 2 confirmed the existence of well-separated ions and both 1 and 2 show notable thermal stability at room temperature. The cation in 2 was also observed in the remarkable mixed-valent complex [Yb(II)(C(6)F(5))(thf)(5)][Yb(III)(C(6)F(5))(2)[N(SiMe(3))(2)](2)] (3), fortuitously isolated in low yield from a reaction of ytterbium metal, HgPh(C(6)F(5)), and HN(SiMe(3))(2) in THF, and which additionally has an unusual bis(pentafluorophenyl)bis[bis(trimethylsilyl)amido)]ytterbate(III) anion. (171)Yb-(19)F coupling has been observed in the low-temperature (171)Yb NMR spectra of 2 and [Yb(C(6)F(5))(2)(thf)(4)].
authors.affiliation: School of Chemistry, Monash University, Wellington Rd., Victoria 3800, Australia. glen.deacon@sci.monash.edu.au
authors.forename: Glen B
authors.initials: GB
authors.lastname: Deacon
authors.forename: Craig M
authors.initials: CM
authors.lastname: Forsyth
mesh_terms: D002412:Cations / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry
chemical_list: D002412:Cations; D028581:Lanthanoid Series Elements; D009942:Organometallic Compounds