One-Step Versus Multistep Equilibrium of Carbazole-Bridged Dinuclear Zinc(II) Complex Formation: Metal-Assisted π-Association and -Dissociation Processes
作者:Norie Inukai、Tsuyoshi Kawai、Junpei Yuasa
DOI:10.1002/chem.201403036
日期:2014.11.10
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 π stacking of building blocks. The building blocks of carbazole ligands (L1 and L4) 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
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)(Zn 2+)配合物形成中的一步还是逐步进行,这与构件的π堆积有关。咔唑配体的构建块(大号1和大号4含有两个咪唑片断在3,6-位置)形成的4:2络合物(即,[大号] 4 (锌2+)2)以摩尔比0.50([Zn 2+ ] / [ L ] 0 = 0.50),从而在咔唑配体之间提供π堆积。摩尔比为0.67([Zn2+ ] / [大号] 0 = 0.67),4:2络合物更改为3:2层的复合物(即,[大号] 3 (锌2+)2),没有π堆叠咔唑单元。相反,当在咪唑基团大号1与苯并咪唑基团(取代大号3),大号3也产生了4:2配合物[(大号3)4 (锌2+)2 ]以0.50的摩尔比。然而,没有来自结构转变(大号3)4 (锌2+)2与摩尔比大于0.50的其他复杂物种。类似地,当两个咪唑基引入咔唑环在2,7-位置(大号5),