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首页> 外文期刊>Macromolecular chemistry and physics >An EPR Study of the V(IV) Species Formed Upon Activation of a Vanadyl Phenoxyimine Polymerization Catalyst with AlR3 and AlR2Cl (R = Me, Et)
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An EPR Study of the V(IV) Species Formed Upon Activation of a Vanadyl Phenoxyimine Polymerization Catalyst with AlR3 and AlR2Cl (R = Me, Et)

机译:EPR研究V(IV)物种在AlR3和AlR2Cl(R = Me,Et)活化氧钒基苯氧亚胺聚合催化剂后形成

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Vanadium(IV) complexes formed in the systems (L2VO)-O-IV/AlR3, (L2VO)-O-VI/AlR3/ETA, (L2VO)-O-VI/AlR2Cl, and (L2VO)-O-IV/AlR2Cl/ETA, where L is a phenoxyimine ligand (Scheme 1), R = Me or Et, and ETA is ethyltrichloroacetate, were monitored by EPR. It was shown, that at 20 degrees C, V(IV) complexes with proposed structures (L')V-IV(O)(R)(AlR3) are formed in the systems (L2VO)-O-IV/AlR(3)and (L2VO)-O-IV/AlR3/ETA, whereas complexes with proposed structures (L)V-IV(O)(R)(AlR2Cl) are formed in the systems (L2VO)-O-IV/AlR2Cl and (L2VO)-O-IV/AlR2Cl/ETA (L' is the modified initial ligand). The systems (L2VO)-O-IV/AlR3/ETA are inert towards polymerization of ethylene, whereas the systems (L2VO)-O-IV/AlR2Cl/ETA are moderately active in this reaction. The polymerization activity of the systems (L2VO)-O-IV/AlR2Cl/ETA correlates with the concentration of V(IV) species present in the reaction solution. V(IV) complexes of the type (L')V-IV(O)(R)(AlR2Cl) can be precursors of the active species of polymerization.
机译:(L2VO)-O-IV / AlR3,(L2VO)-O-VI / AlR3 / ETA,(L2VO)-O-VI / AlR2Cl和(L2VO)-O-IV /通过EPR监测AlR2Cl / ETA,其中L为苯氧基亚胺配体(方案1),R = Me或Et,ETA为三氯乙酸乙酯。结果表明,在20°C的体系(L2VO)-O-IV / AlR(3)中形成具有拟议结构(L')V-IV(O)(R)(AlR3)的V(IV)配合物)和(L2VO)-O-IV / AlR3 / ETA,而在(L2VO)-O-IV / AlR2Cl系统中形成具有拟议结构(L)V-IV(O)(R)(AlR2Cl)的配合物。 L2VO)-O-IV / AlR2Cl / ETA(L'是修饰的初始配体)。系统(L2VO)-O-IV / AlR3 / ETA对乙烯的聚合反应呈惰性,而系统(L2VO)-O-IV / AlR2Cl / ETA在该反应中具有中等活性。 (L2VO)-O-IV / AlR2Cl / ETA体系的聚合活性与反应溶液中存在的V(IV)种类的浓度相关。 (L')V-IV(O)(R)(AlR2Cl)类型的V(IV)络合物可以是聚合活性物质的前体。

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