【作者】 朱嘉星； 凌云；

【Author】 Jiaxing Zhu;Yun Ling;Department of Chemistry, University of Fudan;

【机构】 复旦大学化学系；

【摘要】 柔性金属骨架有机结构（Flexible Metal-Organic Frameworks,Flexible MOFs）是一种在外界刺激条件下发生可逆相变的金属有机骨架材料（MOFs）,由于其具有晶态结构所少有的结构柔性而被广泛研究。其柔性一般源于柔性次级构筑单元中配位键的解离。车辅式单元作为最常见的柔性次级构筑单元,在Zn（BDC）（dabco）、MIL-88等结构中被报道。然而,由于车辅式单元中的配位键较弱,易扭曲、断裂,导致MOFs材料发生不可逆相变,限制了此类柔性材料的应用。我们通过向含有车辅式单元的MOFs结构中,引入含有强配位键的三氮唑双核次级构筑单元,构建了含有多种次级构筑单元的柔性MOFs材料^[1]。这类材料既保持了车辅式单元中配位键的解离所带来的结构柔性,同时引入三氮唑双核单元,提升了结构的稳定性。此外,我们通过配体替换^[2]、客体分子交换^[3]、金属掺杂^[4]等后修饰策略,合成了一系列柔性MOFs材料。使用这种策略,为我们合成柔性MOFs材料及调节骨架柔性提供了思路和方法,也为我们之后进一步研究这类具有多种次级构筑单元的柔性MOFs材料性质打下基础。更多还原

【Abstract】 Flexible metal-organic Frameworks （Flexible MOFs）,which can also be called soft porous crystals （SPCs）,have reversible phase transition phenomenon under external stimulation.Flexible MOFs have been widely studied for its rare structural flexibility among the crystalline structures.The flexibility of MOFs is generally derived from the dissociation of coordination bonds in the flexible secondary building units （SBUs）.The paddle-wheel unit,which is the most common soft SBUs,has been reported in Zn（BDC）（dabco）,MIL-88 and other flexible structures.However,due to the relatively weak coordination bond in the paddle-wheel SBUs,it will easily dissociate and fracture,which leads to the irreversible phase transition of MOFs and limits the application of such flexible materials.To solve this problem,we introduce the triazolate di-nuclear SBU,which has strong coordination bonds,into the MOFs structure to construct flexible MOFs with multiple SBUs^[1].This kind of material not only has the structural flexibility,but also maintains the structural stability under external stimulation.In addition,we synthesized a series of flexible MOFs materials through post-modification strategies such as ligand substitution^[2],guest molecule exchange^[3],and metal doping^[4].By using these strategies,we have laid a foundation for our further study on the properties of flexible MOFs materials with multiple SBUs.更多还原