Nickel(II) Complexes Bearing N,O-Chelate Ligands: Synthesis, Solid-Structure Characterization, and Reactivity toward the Polymerization of Polar Monomer
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- 作者：Xiaohui He ; Yingzheng Yao ; Xiang Luo ; Junkai Zhang ; Yunhai Liu ; Ling Zhang ; and Qing Wu
- 刊名：Organometallics
- 出版年：2003
- 出版时间：November 24, 2003
- 年：2003
- 卷：22
- 期：24
- 页码：4952 - 4957
- 全文大小：142K
- 年卷期：v.22,no.24(November 24, 2003)
- ISSN：1520-6041
文摘
Two new moisture- and air-stable bis(
-ketoamino)nickel(II) complexes Ni[R1C(O)CHC(NAr)R2]2 (Ar 
2,6-iPr2C6H3; R1 = R2 = CH3, 1; R1 = C6H5, R2 = CH3, 2), together withthe moderately stable complex Ni2[CH3C(O)CHC(O)CH3]4[H2NtBu]2 (3), which bears amonoanionic O,O-chelate bidentate -diketone and an sp3-N atom of tBuNH2 mixed ligands,were synthesized and characterized. The solid-state structures of the complexes have beendetermined by single-crystal X-ray diffractions. Additionally, these new complexes act ascatalyst precursors for methyl methacrylate polymerization after activation with methylaluminoxane (MAO). The polymers obtained by 1 and 2 show broader polydispersity thanthat obtained by 3. 13C NMR analyses indicate that these catalytic systems initiate MMApolymerization to yield PMMA with rich syndiotacticity microstructure.
-ketoamino)nickel(II) complexes Ni[R1C(O)CHC(NAr)R2]2 (Ar 2,6-iPr2C6H3; R1 = R2 = CH3, 1; R1 = C6H5, R2 = CH3, 2), together withthe moderately stable complex Ni2[CH3C(O)CHC(O)CH3]4[H2NtBu]2 (3), which bears amonoanionic O,O-chelate bidentate -diketone and an sp3-N atom of tBuNH2 mixed ligands,were synthesized and characterized. The solid-state structures of the complexes have beendetermined by single-crystal X-ray diffractions. Additionally, these new complexes act ascatalyst precursors for methyl methacrylate polymerization after activation with methylaluminoxane (MAO). The polymers obtained by 1 and 2 show broader polydispersity thanthat obtained by 3. 13C NMR analyses indicate that these catalytic systems initiate MMApolymerization to yield PMMA with rich syndiotacticity microstructure.