192372-16-0Relevant academic research and scientific papers
Synthesis, characterisation and alkylation reactions of lanthanide β-diketiminates; crystal structures of and
Hitchcock, Peter B.,Lappert, Michael F.,Tian, Shuh
, p. 1945 - 1952 (2007/10/03)
Treatment of two equivalents of the sodium β-diketiminate Na(L-L) 1 with a lanthanide metal(III) chloride, LnCl3, yielded the mononuclear complex (Ln = Ce 3, Pr, Nd 5, Sm or Yb); similarly two equivalents of 1 with TmI3 gave (L-L = N(R)C(Ph)C(H)C(Ph)NR; R = SiMe3>.When 3 was mixed with either one or two equivalents of Li(CHR2) in diethyl ether, the only new cerium-containing product was 9.Lanthanide metal(III) β-diketiminates (Ln = Sm or Yb) or and 13 were obtained from (Ln = Sm or Yb) and K(L-L) in thf, or YbI2 and K(L-L) or K(L-L') in Et2O t)NR; thf = tetrahydrofuran>.The various lanthanide metal β-diketiminates were characterised by elemental analysis, mass spectrometry and multinuclear NMR spectra.The last of these indicated (by variable-temperature experiments) that for 13 two isomers were present.X-Ray diffraction data for 5 and 9 revealed that for each of these crystalline mononuclear complexes the metal atom is well shielded, due to the extremely sterically demanding monoanionic - ligand, which has some η5 character in these molecules.
