کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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66753 | 48448 | 2010 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Stereospecific polymerizations of 1,3-butadiene catalyzed by Co(II) complexes ligated by 2,6-bis(benzimidazolyl)pyridines Stereospecific polymerizations of 1,3-butadiene catalyzed by Co(II) complexes ligated by 2,6-bis(benzimidazolyl)pyridines](/preview/png/66753.png)
The tridentate 2,6-bis(benzimidazolyl)pyridine ligands were combined with CoCl2 to prepare a series of complexes of the general formula: [Py(Bm-R)2]CoCl2 (where Py = pyridyl, Bm = benzimidazolyl, R = H (3a); –Me (3b); –Bz (3c)). These complexes were characterized by mass and elemental analysis, along with X-ray diffraction analysis. The geometry around the five coordinated Co atom in 3c consists of a distorted square pyramid in which cobalt is surrounded by tridentate N^N^N ligand and two chlorines. The Co(II) complexes exhibited high catalytic activities for the polymerization of 1,3-butadiene on activation with alkylaluminums to yield predominantly cis-1,4-polybutadiene with high molecular weight. Choice of cocatalysts was found to be a decisive factor in determining the activity and product microstructure. Ethylaluminum sesquichloride (EASC) was found to be the most efficient one resulting in polymers with about 97% 1,4-cis content. The ligand modification by N-alkylation shows considerable influence on the catalytic activity by virtue of variation of electronic environment of the active centers. The stereoselectivity of the catalysts was consistent for a wide range of reaction conditions, except the formation of a considerable amount of 1,4-trans inserted units at high temperature.
Highly stereoregular polybutadiene polymers with 1,4-cis isomeric content is synthesized using a series of 2,6-bis(benzimidazolyl)pyridine Co(II) on activation with alkylaluminum cocatalysts under moderate reaction conditions.Figure optionsDownload high-quality image (49 K)Download as PowerPoint slide
Journal: Journal of Molecular Catalysis A: Chemical - Volume 325, Issues 1–2, 15 June 2010, Pages 84–90