Synthesis, Molecular Structure, and Solution-Dependent Behavior of Nickel Complexes Chelating Anilido−Imine Donors and Their Catalytic Activity toward Olefin Polymerization
摘要:
A series of novel nickel complexes (1-4) bearing anilido-imine ligands, [((ArN)-N-1=CHC6H4NAr2)NiBr](2) (Ar-1 = Ar-2 = 2,6-dimethylphenyl, 1; Ar-1 = 2,6-dimethylphenyl, Ar-2 = 2,6-diisopropylphenyl, 2; Ar-1 = Ar-2 = 2,6-diisopropylphenyl, 3; Ar-1 = 2,6-diisopropylphenyl, Ar-2 = 2,6-dimethylphenyl, 4), have been synthesized and characterized. The solid-state structures of the complexes 1, 2, and 4 were confirmed by X-ray single-crystal analyses to be in the form of a dinuclear and bromine-bridged structure. However, there is an equilibrium that shifts between the monomer and dimer in solution, which has been monitored using H-1 NMR and UV-vis spectrophotometry. The themodynamic parameters for the equilibriums were calculated to be DeltaH = +13.68 kJ/mol and DeltaS = 40.32 J/(mol K) for 1 and DeltaH = +8.35 kJ/mol and DeltaS = 15.21 J/(mol K) for 3. All nickel complexes show low activities for ethylene oligomerization with MAO as cocatalyst but high catalytic activities for norbornene polymerization in the presence of MAO.
Syntheses, Characterization, and Luminescent Properties of Monoethylzinc Complexes with Anilido–Imine Ligands
作者:Qing Su、Wei Gao、Qiao‐Lin Wu、Ling Ye、Guang‐Hua Li、Ying Mu
DOI:10.1002/ejic.200700182
日期:2007.9
The syntheses of three anilido-imineligands of the general formula ortho-C 6 H 4 (NHAr')(CH=NAr" [Ar' = 7-(2,4-Me 2 )-C 9 H 4 N, Ar" = 2,6-Me 2 C 6 H 3 (2a); Ar' = 7-(2,4-Me 2 )C 9 H 4 N, Ar"= 2,6-Et 2 C 6 H 3 (2b); Ar' = 7-(2,4-Me 2 )C 9 H 4 N, Ar"= 2,6-iPr 2 C 6 H 3 (2c)] and four zinc(II) complexes of the general formula [orho-C 6 H 4 (NHAr')(CH=NAr")]ZnEt [Ar' = 7-(2,4-Me 2 )C 9 H 4 N, Ar"= 2
所有化合物均通过元素分析和 1 H 和 13 C NMR 光谱表征。化合物 2a、2b、3b 和 3c 的分子结构由单晶 X 射线晶体学确定。X射线分析表明配合物3b和3c以二聚体形式存在,喹啉环中的N原子与另一个Zn原子配位,使Zn原子四配位。研究了配体2a-2d和配合物3a-3d在溶液和固态中的发光特性。