Syntheses,structures and catalytic activities of low-coordinated rare-earth metal complexes containing 2,2′-pyridylpyrrolides |
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| Authors: | Jun Du Shuangliu Zhou Xiuli Zhang Lijun Zhang Peng Cui Zeming Huang Yun Wei Xiancui Zhu Shaowu Wang |
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| Affiliation: | Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, China |
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| Abstract: | Reactions of the ligand precursors 2-(2′-pyridyl)-3,5-Me2-pyrrole ( L 1 H) and 2-(2-pyridyl)-3,4,5-Me3-pyrrole ( L 2 H) with [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 in toluene afforded a series of low-coordinated rare-earth metal bis-amido complexes L 1 RE[N(SiMe3)2]2 [RE = Y ( 1a ), Dy ( 1b ), Er ( 1c ), Yb ( 1d )] and L 2 RE[N(SiMe3)2]2 [RE = Y ( 2a ), Dy ( 2b ), Er ( 2c ), Yb ( 2d )]. With the ionic radius of rare-earth metal increasing, the reaction of L 1 H and [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 gave dinuclear complexes ( L 1 )2RE(μ-Cl)(μ-η5:η1:η1- L 1 )RE( L 1 )[N(SiMe3)2]2 [RE = Sm ( 1e ), Pr ( 1f )]; however, the reaction of L 2 H and [(Me3Si)2N]3Sm(μ-Cl)Li(THF)3 afforded ( L 2 )2Sm[N(SiMe3)2]2 ( 2e ). Results indicated that the ionic radius of rare-earth metal and subtle change in the ligands have substantial effects on the structure and bonding mode of complexes. The complexes showed a high catalytic activity for the ring-opening reaction of cyclohexene oxide with amines to afford various β-aminoalcohols under mild solvent-free conditions. |
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| Keywords: | 2,2'-pyridylpyrrolide catalysis rare-earth metal complex X-ray analysis |
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