丁二烯聚合铁催化体系FeCl_3-phen-Al(i-Bu)_3的紫外可见光谱

Synthesis of Polybutadiene with Iron-Catalyst System FeCl_3-phen-Al(i-Bu)_3 …UY-Vis Spectra of Catalyat System

紫外可见光谱表明,phen能与Fe(Ⅲ)、Fe(Ⅱ)、Al(Ⅲ)形成稳定络合物,其电荷转移跃迁吸收峰分别在355、515和260mm处;在FeCl_3^-phen-Al(i-Bu)_3体系中,随Al/Fe摩尔比由小到大,Fe(Ⅲ)-phen络合物逐渐减少,而Fe(Ⅱ)-phen络合物逐渐增多;Al(Ⅲ)、Fe(Ⅲ)、Fe(n)之间有竞争phen配体的现象存在。

In the iron - catalyst system O - phenanthioline ( phen ) could combine with Fe (Ⅲ), Fe (Ⅱ) and Ai (Ⅲ) to form stable complexes, and their absorption bands from the charge transfer between metal cation and phen ligand were 355 nm, 515nm and 260 nm respectively. The amount of Fe (Ⅲ) - phen complex would decrease with the increase of the mole ratio Al / Fe whereas Fe ( II ) ~ phen complex would increase. It was also found that there existed the competition for the phen Ligand among the components Al (Ⅲ), Fe (Ⅱ) and Fe (Ⅲ).