671802-46-3Relevant academic research and scientific papers
Neutral and cationic trimethylsilylmethyl complexes of the rare earth metals supported by a crown ether: Synthesis and structural characterization
Arndt, Stefan,Zeimentz, Peter M.,Spaniol, Thomas P.,Okuda, Jun,Honda, Masaru,Tatsumi, Kazuyuki
, p. 3622 - 3627 (2007/10/03)
The synthesis of a series of thermally robust, isolable trimethylsilylmethyl complexes of the rare earth metals stabilized by 12-crown-4 [Ln(CH2SiMe3)3(12-crown-4)] (Ln = Sc, Y, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) is reported. The crystallographically characterized yttrium and lutetium complexes [Ln(CH 2SiMe3)3(12-crown-4)] exhibit facial coordination of the crown ether at the neutral lanthanide trialkyl unit. The coordination geometry can be derived from a capped octahedron. VT NMR spectroscopic studies revealed a labile coordination of the crown ether in thf solution. Reaction of the diamagnetic derivatives with triethylammonium tetraphenylborate in thf results in the clean formation of the cationic dialkyl complexes [Ln(CH2SiMe3)2(12-crown-4)(thf) y][BPh4] (Ln = Sc, Y, y = 0; Ln = Lu, y = 1), which also exhibit an exocyclic coordination of the crown ether to the cationic dialkyl lanthanide fragment.
