Niobium-based ethylene polymerization procatalysts bearing di- and triphenolate ligands
Niobium-based ethylene polymerization procatalysts bearing di- and triphenolate ligands
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DOI：
10.1016/j.ica.2005.05.013
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发表时间：
2005-09-01
影响因子：
2.8
通讯作者：
Elsegood, MRJ
中科院分区：
文献类型：
--
作者：
Redshaw, C;Homden, DM;Elsegood, MRJ
[NbCl_5]与二酚2，2 ′-CH_3CH [4，6-（Bu-t）（2）C_6 H_2 OH]（2）（LH_2）反应，经后处理，得到红色晶体配合物[NbCl（NCMe）L-2]（1）。在相似条件下，[NbOCl_3]与硫桥联苯酚2，2 '-S[4，6-（Bu-t）（2）C_6H_2 OH]（2）（（LH_2）-H-s）形成橙子配合物[NbCl（L-S）（2）]（2）。I（.）2 MeCN和2分别显示单体6-和7-配位络合物。考察了在烷基铝助催化剂存在下，I和2对乙烯的聚合行为，并与已知的铌芳氧化物[Nb（Me-L-2）Cl-2/（2）（3），{Nb[（Bu-t-L-2）H]（2）Cl-（NCMe）}（4）和[Nb（Bu-t-L-2）Cl-2]（5），衍生自线性连接的芳氧化物三聚体2，6-bis（4，6-二甲基水杨基）-4-叔丁基苯酚[（Me-L 2）H-3]和2，6-双（4-甲基-6-叔丁基水杨基）-4-叔丁基苯酚[（Bu-t-L-2）H-3]。3（.）4 MeCN也有报道。(c)2005 Elsevier B. V.保留所有权利。
Interaction of [NbCl5] with the diphenol 2,2'-CH3CH[4,6-(Bu-t)(2)C6H2OH](2) (LH2) affords, after work-up, the red crystalline complex [NbCl(NCMe)L-2] (1). Under similar conditions, [NbOCl3] and the sulfur-bridged diphenol 2,2'-S[4,6-(Bu-t)(2)C6H2OH](2) ((LH2)-H-s) afford the orange complex [NbCl(L-S)(2)] (2). Crystal structure determinations of I (.) 2MeCN and 2 reveal monomeric 6- and 7-coordinate complexes, respectively. The polymerization behaviour of I and 2 towards ethylene, in the presence of alkylaluminium co-catalysts has been examined and has been compared with that of the known niobium aryloxides [Nb(Me-L-2)Cl-2/(2) (3), {Nb[(Bu-t-L-2)H](2)Cl-(NCMe)} (4) and [Nb(Bu-t-L-2)Cl-2] (5), derived from the linear-linked aryloxide trimers 2,6-bis(4,6-dimethylsalicyl)-4-tert-butylphenol [(Me-L 2)H-3] and 2,6-bis(4-methyl-6-tert-butylsalicyl)-4-tert-butylphenol [(Bu-t-L-2)H-3]. The crystal structure of the acetonitrile solvate of 3 (.) 4MeCN, is also reported. (c) 2005 Elsevier B.V. All rights reserved.