首页> 外文期刊>Chemistry: A European journal >One-Step Versus Multistep Equilibrium of Carbazole-Bridged Dinuclear Zinc(II) Complex Formation: Metal-Assisted pi-Association and -Dissociation Processes
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One-Step Versus Multistep Equilibrium of Carbazole-Bridged Dinuclear Zinc(II) Complex Formation: Metal-Assisted pi-Association and -Dissociation Processes

机译:咔唑桥联双核锌(II)配合物形成的一步与多步平衡:金属辅助的π缔合和解离过程

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摘要

This work demonstrates a selection criteria that determines whether molecular assembly occurs through a one-step or stepwise manner in ligand-bridged dinuclear zinc(II) (Zn2+) complex formation, which is associated with the stacking of building blocks. The building blocks of carbazole ligands (L-1 and L-4) that contain two imidazole moieties at the 3,6-positions form 4:2 complexes (i.e., [L](4)(Zn2+)(2)) at a molar ratio of 0.50 ([Zn2+]/[L](0)=0.50), thereby providing stacking between the carbazole ligands. At the molar ratio of 0.67 ([Zn2+]/[L](0)=0.67), the 4:2 complexes change to 3:2 complexes (i.e., [L](3)(Zn2+)(2)) with no -stacked carbazole unit. In contrast, when the imidazole groups in L-1 are replaced with benzoimidazole groups (L-3), L-3 also yields the 4:2 complex [(L-3)(4)(Zn2+)(2)] at a molar ratio of 0.50. However, there is no structural transition from (L-3)(4)(Zn2+)(2) to other complex species above a molar ratio of 0.50. Similarly, when two imidazole groups are introduced into the carbazole ring at 2,7-positions (L-5), L-5 also gives the 4:2 complex [(L-5)(4)(Zn2+)(2)] that shows no structural transition to other complex species at a higher molar ratio.
机译:这项工作证明了选择标准,该选择标准确定分子组装是通过配体桥联的双核锌(II)(Zn2 +)配合物形成中的一步还是逐步进行,这与构件的堆积有关。在3,6-位含有两个咪唑部分的咔唑配体(L-1和L-4)的结构单元在a处形成4:2配合物(即[L](4)(Zn2 +)(2))。摩尔比为0.50([Zn2 +] / [L](0)= 0.50),从而在咔唑配体之间提供堆积。在摩尔比为0.67([Zn2 +] / [L](0)= 0.67)时,4:2的络合物变为3:2的络合物(即[L](3)(Zn2 +)(2)),没有堆积的咔唑单元。相比之下,当L-1中的咪唑基团被苯并咪唑基团(L-3)取代时,L-3还会在4位时生成4:2络合物[(L-3)(4)(Zn2 +)(2)]。摩尔比为0.50。但是,在摩尔比大于0.50时,从(L-3)(4)(Zn2 +)(2)到其他配合物没有结构过渡。同样,当在2,7位(L-5)的咔唑环中引入两个咪唑基团时,L-5还会生成4:2的配合物[(L-5)(4)(Zn2 +)(2)]在较高的摩尔比下,没有显示出向其他复杂物种的结构转变。

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