Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China.
J Am Chem Soc. 2020 Sep 23;142(38):16471-16478. doi: 10.1021/jacs.0c07969. Epub 2020 Sep 10.
Here we report the first two-dimensional (2D) supramolecular polymer, which has varying structure and function arising from the perturbation of noncovalent metal···metal interactions in response to acid-base stimuli. This 2D assembly possesses a positively charged, honeycomb-like nanostructure consisting of trinuclear alkynylplatinum(II) terpyridine complexes appended with acid-sensitive dimethylamino groups. Upon addition of acids and bases, reversible switching mediated by protonation and deprotonation of dimethylamino and dimethylammonium moieties intrinsically alters the positive charge density of the constituent cationic units, which causes interior cavities to adaptively adjust their size, accompanied by drastic photoluminescence changes. When water molecules pass through the membranes obtained from 2D supramolecular polymers, the permeating flux can also be tuned by the pH values of the buffer media. This work paves the way toward supramolecularly engineered 2D smart materials with stimuli-responsive properties.
在这里，我们报告了第一个二维（2D）超分子聚合物，它具有不同的结构和功能，这是由于非共价金属···金属相互作用受到酸碱刺激的干扰而产生的。这种 2D 组装体具有正电荷的、类似蜂窝状的纳米结构，由三核炔基铂（II）三联吡啶配合物与酸敏感的二甲氨基基团组成。在添加酸和碱时，通过二甲氨基和二甲铵部分的质子化和去质子化进行可逆切换，从本质上改变了构成阳离子单元的正电荷密度，这导致内部腔自适应地调整其大小，同时伴随着剧烈的荧光变化。当水分子通过 2D 超分子聚合物得到的膜时，渗透通量也可以通过缓冲介质的 pH 值进行调节。这项工作为具有刺激响应特性的超分子工程 2D 智能材料铺平了道路。
