...
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Vanadyl calix[6]arene complexes: synthesis, structural studies and ethylene homo-(co-)polymerization capability
【24h】

Vanadyl calix[6]arene complexes: synthesis, structural studies and ethylene homo-(co-)polymerization capability

机译:钒基杯[6]芳烃配合物:合成,结构研究和乙烯均(共)聚合能力

获取原文
获取原文并翻译 | 示例
           

摘要

Treatment of p-tert-butylcalix[6]areneH(6) ((LH6)-H-6) with in situ [LiVO(Ot-Bu)(4)] afforded, after work-up, the dark green complex [Li(MeCN)(4)][V-2(O)(2)Li(MeCN)((LH2)-H-6)(2)]center dot 8MeCN (1 center dot 8MeCN). On one occasion, the reaction led to the formation of a mixture of products, the bulk of which differing from 1 only in the amount of solvate, viz. 2 center dot 9.67MeCN. The second minor, yellow product has the formula {[(VO2)(2)((LH2)-H-6)(Li(MeCN)(2))(2)]center dot 2MeCN}(n) (3 center dot 2MeCN), and comprises a 1D polymeric structure with links through the (LH2)-H-6 ligand and Li2O2 units. When the reverse order of addition was employed such that lithium tert-butoxide (7.5 equivalents) was added to (LH6)-H-6, and subsequently treated with VOCl3 (2 equiv.), the complex {[VO(THF)][VO(mu-O)](2)Li(THF)(Et2O)][L-6]}center dot 2Et(2)O center dot 0.5THF (4 center dot 2Et(2)O center dot 0.5THF), which contains a trinuclear motif possessing a central, octahedral vanadyl centre linked via oxo bridges to two tetrahedral (C-3v) vanadyl centres, was isolated. The calix[6] arene in 4 is severely twisted and adopts a 'down, down, down, down, out, out' conformation. Use of excess lithium tert-butoxide led to a complex very similar to 4, differing only in the solvent of crystallization, namely 5 center dot t(2)O center dot 2THF. The ability of 1 and 5 to act as pre-catalysts for ethylene polymerization in the presence of a variety of co-catalysts and under various conditions has been investigated. Co-polymerization of ethylene with propylene and with 1-hexene have also been conducted; results are compared versus VO(OEt) Cl-2.
机译:处理后,用原位[LiVO(Ot-Bu)(4)]处理对叔丁基杯[6]芳烃H(6)((LH6)-H-6),得到深绿色配合物[Li (MeCN)(4)] [V-2(O)(2)Li(MeCN)((LH2)-H-6)(2)]中心点8MeCN(1个中心点8MeCN)。在一种情况下,该反应导致形成产物的混合物,其产物的仅溶剂合物的量即1不同于1。 2个中心点9.67MeCN。第二副黄色产物具有式{[(VO2)(2)((LH2)-H-6)(Li(MeCN)(2))(2)]中心点2MeCN}(n)(3中心点2MeCN),并包含一维聚合物结构,该结构具有通过(LH2)-H-6配体和Li2O2单元的链接。当采用相反的添加顺序,以便将叔丁醇锂(7.5当量)添加到(LH6)-H-6中,然后用VOCl3(2当量)处理时,络合物{[VO(THF)] [ VO(mu-O)](2)Li(THF)(Et2O)] [L-6]}中心点2Et(2)O中心点0.5THF(4中心点2Et(2)O中心点0.5THF),分离出含有三核基序的基序,该基序具有通过氧代桥连接到两个四面体(C-3v)钒基中心的中央八面体钒基中心。杯[6]芳烃在4中严重扭曲,并采用“向下,向下,向下,向下,向下,向外,向外”构型。使用过量的叔丁醇锂会形成非常类似于4的络合物,仅在结晶溶剂方面有所不同,即5个中心点t(2)O中心点2THF。已经研究了在各种助催化剂存在下和在各种条件下1和5充当乙烯聚合的预催化剂的能力。还已经进行了乙烯与丙烯以及与1-己烯的共聚合。将结果与VO(OEt)Cl-2进行比较。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号