Diverse coordination behaviors of the silyl-linked bis(amidinate) ligand [SiMe2{NC(Ph)N(Ph)}(2)](2-) to zirconium center

作者：Bai Sheng Di^*; Tong Hong Bo; Guo Jian Ping; Zhou Mei Su; Liu Dian Sheng; Yuan Shi Fang

来源：Polyhedron, 2010, 29(1): 262-269.

DOI：10.1016/j.poly.2009.08.029

• Zirconium
• Silyl-linked
• Bis(amidinate)
• Tris(amidinate)
• Rearrangement

The reactions between the silyl-linked bis(amidinate) ligand [SiMe2{NC(Ph)N(Ph)Li(thf)(2)}(2)] and ZrCl4 in different stoichiometric chemistry, 2:1. 1:1, and 1:2, were explored. The resulting zirconium compounds, 1, 2, and 3, showed different molecular structural features which were confirmed by X-ray crystallographic analysis. The metal center in I was located in a highly saturated coordination environment with four amidinate moieties. Compound 2 exhibited an unprecedented linked tris(amidinate) N-C-N-Si-N-C-N-Si-N-C-N skeleton formed after the intermolecular rearrangement. In compound 3, a novel silyl-linked imino-amidinate ligand via the intramolecular rearrangement was involved. The mechanism for the formation Of Compounds 2 and 3 was proposed. Compound 2 was found to be a highly active catalyst for ethylene polymerization in the presence of methylalumoxane (MAO).

• 出版日期2010-1-13
• 单位中国科学院长春应用化学研究所; 山西大学