Magnesium, zinc and aluminium complexes supported by tripodal diaminebis(aryloxido) ligands: synthesis, solid state and solution structure
作者:Ewa Kober、Zofia Janas、Tomasz Nerkowski、Lucjan B. Jerzykiewicz
DOI:10.1039/c3dt50938a
日期:——
The reactions of the diaminebis(aryloxido) ligand precursors [Me2NCH2CH2N(CH2-4-R-C6H3OH)2] [R = C(CH3)2CH2C(CH3)3, H22L11; R = CH3, H22L22] with MgnBu2, ZnEt2 and AlEt3 create complexes of general formula [M2(μ-L-κ4O,N,N,O)2] (M = Mg, 1a for L1 and 1b for L2; M = Zn, 2a for L1 and 2b for L2) and [Al2(μ-L-κ3O,N,N,O)2Et2] (3 for L1) in good yields. Compounds 1a–3 were characterized by NMR spectroscopy and ESI-MS experiments. The definitive molecular structure of 1b·CH2Cl2, 2a·H2O, 2b·CH2Cl2 and 3 was provided by a single-crystal analysis and revealed their dimeric nature with an M2O2 planar core. The L1 and L2 ligands coordinate as the dianions in a tetradentate/bridging manner in 1b, 2a, 2b and in a tridentate/bridging mode in 3. The NMR spectra showed that the solid state of these compounds is essentially retained in solution.
二氨基双(芳基氧)配体前体[Me2NCH2CH2N(CH2-4-R-C6H3OH)2][R = C(CH3)2CH2C(CH3)3, H22L11;R=CH3,H22L22]与 MgnBu2、ZnEt2 和 AlEt3 生成通式为[M2(μ-L-κ4O,N,N,O)2](M=Mg,1a 表示 L1,1b 表示 L2;M=Zn,2a 表示 L1,2b 表示 L2)和[Al2(μ-L-κ3O,N,N,O)2Et2](3 表示 L1)的复合物。通过核磁共振光谱和 ESI-MS 实验对化合物 1a-3 进行了表征。单晶分析提供了 1b-CH2Cl2、2a-H2O、2b-CH2Cl2 和 3 的确切分子结构,并揭示了它们具有 M2O2 平面核心的二聚体性质。核磁共振光谱显示,这些化合物的固态基本上保留在溶液中。