具有尺寸和电荷选择性多功能分子吸附能力的电荷可转变型金属-有机框架材料

通过研究具有两种轮桨状构筑基元和四种纳米笼子结构锌基金属-有机框架(Zn-MOF)的染料吸附特性和机理,发现其分子吸附的普适性, 以及尺寸和电荷的选择性。由于Zn-MOF孔道内漂浮着抗衡阴离子, 及框架上有可配位位点, 所以它能通过离子交换机理吸附阴性染料、框架上电荷转变机理吸附阳性染料、主客体相互作用吸附中性染料, 表现出优越的分子吸附多功能性。Zn-MOF内带电荷纳米笼的尺寸选择性和电荷选择性的共同作用为设计具有更高水平兼容性和识别性的优异多孔材料铺平了道路。

Charge-switchable Metal-organic Framework for Size/Charge-selective Molecular Inclusions

Highly size/charge-selective molecular inclusions by a charge-switchable zinc-based metal-organic framework (Zn-MOF) have been achieved, which comprises of two kinds of paddle-wheel building units and four kinds of nanocages. Featuring counter anions floating in the pore and accessible coordination sites on the skeleton, Zn-MOF represents exceptional versatility in taking up anionic dyes by ion-exchange, cationic dyes by charge switch of skeleton, and neutral organic dyes by host-guest interactions. Both size and charge selectivities in the molecular inclusion by the charged nanocages in Zn-MOF provide an efficient way in designing superior porous materials with an enhanced level of compatibility and recognition.