【摘要】 <正> 迄今为止关于锆的ESR研究报导甚少。CaMaTOB等发表了掺杂在YPO₄中的Zr³⁺的ESR谱参数; Abraham等报导了俘获干磷酸单晶中Zr³⁺的ESR研究;Kartel等用ESR手段表征了ZrPO₄的微孔结构;Robert等以LiAlH（OCMe₃）₃为还原剂由CP₂ZrCl（CH₂PPh₂）制得Cp₂ZrH（CH₂PPh₂）,然后热解所得产物,观测到Zr³⁺络合物的ESR信号;Atkinson等研究了有机金属锆系列化合物,获得有机自由基信号和Zr³⁺的ESR信号。本文研究ZrCl₄的Ziegler-Natta体系催化乙烯齐聚中锆的价态及自旋浓度的变化。更多还原

【Abstract】 ESR spectra of zirconium in ZrCl₄/AlEt₂Cl and ZrCl₄/AlEt₂Cl-n-C₄H₉ONa catalystsystems were recorded at various reaction times, the g=1.978, △Hpp=22.4×10^-4T. Thespin concentration s were determined for two systems. It is shown that Zr⁴⁺is first redu-ced to Zr³⁺, which is further reduced to lower state. The reduction rate of Zr⁴⁺andZr³⁺ in ZrCl₄/AlEt₂Cl-n-C₄H₉ONa system is lower than that in ZrCl₄/AlEt₂Cl system.This fact indicates that n-C₄H₉ONa plays an importent rolc in restraining reduction of Zr⁴⁺and Zr³⁺.更多还原