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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Zinc halide template effects on the construction of[1 + 1] flexible Schiff-base macrocyclic complexes having pendant-armed dialdehyde components
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Zinc halide template effects on the construction of[1 + 1] flexible Schiff-base macrocyclic complexes having pendant-armed dialdehyde components

机译:卤化锌模板对具有侧挂臂二醛成分的[1 + 1]柔性席夫碱大环配合物的结构影响

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摘要

Two novel pendant-armed dialdehydes (1a and 1b) were prepared by a one-step reaction between5-chloro-3-(chloromethyl)-2-hydroxybenzaldehyde/5-methyl-3-(chloromethyl)-2-hydroxybenzaldehyde and cyclohexylamine involving two nucleophilic substitutions, and they were used to react with 1,3-propanediamine to prepare Schiff-base macrocyclic complexes in the presence of ZnX_2 salts (X = Cl, Br, and I). As a result, five dinuclear (2a, 2b, 3b, 4a, and 4b) and one mononuclear (3a) [1 + 1] flexible macrocyclic Zn(II) complexes have been structurally and spectrally characterized. The zinc centers in three pairs of macrocyclic complexes have the common four-coordinate tetrahedral geometry with one or two coordinated halide ions, where the template Zn(II) cations and the auxiliary halide anions with different sizes and coordination abilities are believed to play important roles in forming the resulting macrocyclic complexes. In addition, subtle alterations of electron-withdrawing and electron-donating substituted groups (Cl versus CH_3) in the macrocyclic backbone result in different 1H NMR and UV-vis spectra.
机译:通过5-氯-3-(氯甲基)-2-羟基苯甲醛/ 5-甲基-3-(氯甲基)-2-羟基苯甲醛与环己胺之间的一步反应,制备了两种新型的悬臂二醛(1a和1b)。亲核取代,并在ZnX_2盐(X = Cl,Br和I)存在下,将它们与1,3-丙二胺反应以制备席夫碱大环配合物。结果,已经在结构和光谱上表征了五个双核(2a,2b,3b,4a和4b)和一个单核(3a)[1 + 1]柔性大环Zn(II)配合物。三对大环配合物中的锌中心具有共同的四配位四面体几何结构,具有一个或两个配位的卤化物离子,其中模板Zn(II)阳离子和不同尺寸和配位能力的辅助卤化物阴离子据信起着重要的作用在形成所得的大环配合物中。此外,大环主链中吸电子和供电子取代基(Cl对CH_3)的细微变化导致不同的1H NMR和UV-vis光谱。

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