Acta Chimica Sinica ›› 1979, Vol. 37 ›› Issue (2): 111-118.

### 异戊二烯聚合催化体系Ln(naph)3-Al(i-C4H9) 3-Al2(C2H5) 3Cl3中稀土金属离子的价态

1. 中国科学院吉林应用化学研究所
• 投稿日期:1978-02-01 发布日期:2013-06-03

### THE VALENCE STATE OF RARE EARTH METAL IONS IN THE CATALYST SYSTEM Ln(naph)3-Al(i-C4H9)3-Al2(C2H5)3Cl3 FOR POLYMERIZATION OF ISOPRENE

WANG FO-SONG, ZHAO XIAO-JIANG, JIANG CHENG-DE, GONG ZHI

1. Kirin Institute of Applied Chemistry, Academia Sinica
• Received:1978-02-01 Published:2013-06-03

Spoctrophotometric study of the valence of rare earth ions in catalyst system Ln(napb)3-Al(i-C4H9)3-Al2(C2H5)3Cl3 has shown that ions of Pr, Nd, Gd, and Er in the catalyst system are in a valence state of 3, and the difference in Choir oatalytio activity toward isoprene polymerization is not due to the difference in their valence state. The catalytio activity of the system Ln(napb)3-Al(i-C4H9)3-Al2(C2H5)3Cl3 is related to the absorption intensity at 582 mμ. The stronger is the absorption, the higher is the catalytic activity. With increasing Al/Ln molar ratio and ageing time of the catalyst, the absorption intensity at 582 mμ and the catalytic activity are also inoreased.