کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1323854 | 977307 | 2006 | 6 صفحه PDF | دانلود رایگان |
Reactions of LnCl3, NaBH4 and ArONa (Ar = C6H2-t-Bu3-2,4,6) in a molar ratio of 1:3:1 in THF afforded the aryloxide lanthanide borohydrides of (ArO)Ln(BH4)2(THF)2 (Ln = Yb (1), Er (2)). They were characterized by elemental analysis, infrared spectrum and X-ray crystallography. The two complexes are neutral and isostructural. The lanthanide atom is nine-coordinated by an aryloxide ligand, two borohydride ligands and two THF ligands in a trigonal bipyramidal geometry. Both of the BH4 ligands in each monomeric complex are η3-coordinated. These complexes displayed moderate high catalytic activities for the polymerization of methyl methacrylate. The polymerization temperature had great influence on the catalysis. At about 0 °C, the catalysts showed the polymerization activity best.
The title complexes were synthesized by ‘one pot’ reactions of LnCl3, NaBH4 and ArONa (Ar = C6H2-t-Bu3-2,4,6) in a molar ratio of 1:3:1 in THF. They are isostructural. Both of the BH4 ligands in each monomeric complex are η3-coordinated. These complexes displayed moderate high catalytic activities for the polymerization of methyl methacrylate. At about 0 °C, the catalysts showed the polymerization activity best.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 691, Issue 11, 15 May 2006, Pages 2534–2539