کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1328519 | 977584 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Syntheses and molecular structures of mono(guanidinate) lanthanide borohydrides and their catalytic activity for MMA-polymerization Syntheses and molecular structures of mono(guanidinate) lanthanide borohydrides and their catalytic activity for MMA-polymerization](/preview/png/1328519.png)
The mono(guanidinate) lanthanide borohydride complexes of [(Me3Si)2NC(NCy)2]Ln(BH4)2(THF)2 (Ln = Yb (1), Er (2)) have been synthesized by the reactions of corresponding Ln(BH4)3(THF)3 with sodium guanidinate of [(Me3Si)2NC(NCy)2]Na in a 1:1 molar ratio in THF. They were characterized by elemental analysis, infrared spectrum and X-ray diffraction analysis. 1 and 2 have similar structures. The lanthanide ion was bonded by an η2-guanidinate ligand, two η3-BH4 ligands and two THF molecules as a distorted octahedron. The two BH4 ligands in a complex are equivalent and cis to each other. The structure of solvated sodium guanidinate of {[(Me3Si)2NC(NCy)2]Na(THF)}2 (3) was also presented. In a dimeric molecule of 3, each Na atom is bound to three nitrogen atoms from two guanidinate groups and one oxygen atom from the THF molecule. 1 and 2 displayed moderate high catalytic activity for the polymerization of methyl methacrylate. The Er complex is more active than the Yb complex.
The mono(guanidinate) lanthanide borohydride complexes of 1 and 2 have been synthesized by the reactions of Ln(BH4)3(THF)3 with sodium guanidinate of [(Me3Si)2NC(NCy)2]Na in a 1:1 molar ratio in THF. They were characterized by elemental analysis, infrared spectrum and X-ray diffraction analysis. The lanthanide ion was bonded by an η2-guanidinate ligand, two η3-BH4- ligands and two THF molecules as a distorted octahedron. The structure of solvated sodium guanidinate of {[(Me3Si)2NC(NCy)2]Na(THF)}2 (3) was also presented. 1 and 2 displayed moderate high catalytic activity for the polymerization of methyl methacrylate.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 691, Issue 15, 15 July 2006, Pages 3377–3382