writer：Tianzhu Zhang, Wen-Hua Sun*, Ting Li, and Xiaozhen Yang*
keywords：Molecular mechanics; QEq charge; Bis(imino)pyridyl Fe(II) and bis(imino)pyrimidyl Fe(II) complexes; Late-transition metal catalyst; Ethylene oligomerization/polymerization
source：期刊
specific source：Journal of Molecular Catalysis A-Chemical, 2004, 218: 119–124
Issue time：2004年
The metal atom net charge correlation (MANCC) was successfully used to study the relative catalytic activities of 20 bis(imino)pyridyl Fe(II) and bis(imino)pyrimidyl Fe(II) complexes for olefins polymerization/oligomerization through modifying the Dreiding force. The net charge range on the central metal Fe was found 0.6295–0.8310, which was considered in the present study as two areas, e.g. the lower charge area (0.6295–0.7000) and the higher charge area (0.7000–0.8310). The observations reveal that the catalytic activity of bis(imino)pyridyl Fe(II) and bis(imino)pyrimidyl Fe(II) complexes does not monotonously vary with the net charge on the central metal as we found for other
metal system before. There possibly is an interesting turning point around 0.7000. The activity increases with the net charge in the lower charge area, while the catalytic activity increases with reducing the net charge in the higher area. The reason that the Fe(II) catalysts possess such properties was discussed.