Observations and Mechanistic Insights on Unusual Stability of Neutral Nickel Complexes with a Sterically Crowded Metal Center
文献类型：期刊论文
| 作者 | Song DP ; Wang YX ; Mu HL ; Li BX ; Li YS |
| 刊名 | organometallics
 |
| 出版日期 | 2011 |
| 卷号 | 30期号:5页码:925-934 |
| 关键词 | ETHYLENE POLYMERIZATION CATALYSTS MOLECULAR-DYNAMICS SIMULATIONS FOCK-SLATER CALCULATIONS OLEFIN POLYMERIZATION NORBORNENE POLYMERIZATION PALLADIUM(II) COMPLEXES NI(II) COMPLEXES NI(II)-CATALYZED POLYMERIZATION NICKEL(II)-BASED CATALYSTS AQUEOUS DISPERSIONS |
| ISSN号 | 0276-7333 |
| 通讯作者 | li ys |
| 中文摘要 | a series of novel nickel(ii) methyl pyridine complexes based on beta-ketiminato and phenoxyiminato ligands, [(2,6-(i)pr(2)c(6)h(3))n=ch(8-r(1)c(10)h(7))o]ni(me)(py) (5a, r(1) = phenyl; 5b, r(1) = norbornyl), [(2,6-(i)pr(2)c(6)h(3))n=ch(8-r(1)c(10)h(5))o]ni(me)(py) (6a, r(1) = phenyl; 6b, r(1) = norbornyl), and [(2,6-(i)pr(2)c(6)h(3))n=chchc(2'-r(2)c(6)h(4))o]ni(me)(py) (7a, r(2) = h; 7b, r(2) = phenyl), have been synthesized and characterized. molecular structures of 5a and 6b were further confirmed by x-ray crystallographic analysis. these complexes showed very different catalytic properties for ethylene polymerization. design and construction of a special catalyst structure like 5a with a phenyl group directed toward the nickel(ii) center proved to be an effective strategy for improving catalyst stability. remarkably, according to (1)h nmr spectroscopy, bis-ligated deactivation of complex 5a was entirely avoided, while a rapid deactivation rate was observed with regard to the parent complex c without a phenyl group in the r(1) position. as a result, higher activities of complex 5a were obtained relative to complex c under the same polymerization conditions. in addition, the ligand backbone was found to have a great influence on polymerization behaviors. specifically, the polyethylenes with greatly decreased molecular weights were produced by neutral nickel phenoxyiminato catalysts 6a,b in comparison with values for the corresponding beta-ketiminato catalysts 5a,b. this is best explained by dft results that the ethylene insertion and chain termination barriers for complex 6a are very different from those of complex 5a. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000287955800002 |
| 公开日期 | 2012-06-11 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/44768]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Song DP,Wang YX,Mu HL,et al. Observations and Mechanistic Insights on Unusual Stability of Neutral Nickel Complexes with a Sterically Crowded Metal Center[J]. organometallics,2011,30(5):925-934. |
| APA | Song DP,Wang YX,Mu HL,Li BX,&Li YS.(2011).Observations and Mechanistic Insights on Unusual Stability of Neutral Nickel Complexes with a Sterically Crowded Metal Center.organometallics,30(5),925-934. |
| MLA | Song DP,et al."Observations and Mechanistic Insights on Unusual Stability of Neutral Nickel Complexes with a Sterically Crowded Metal Center".organometallics 30.5(2011):925-934. |
入库方式： OAI收割
来源：长春应用化学研究所
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