Creating Coordination-Based Cavities in a Multiresponsive Supramolecular Gel

被引:57
作者
Wei, Shi-Chao [1 ]
Pan, Mei [1 ]
Fan, Yuan-Zhong [1 ]
Liu, Haoliang [1 ]
Zhang, Jianyong [1 ]
Su, Cheng-Yong [1 ,2 ]
机构
[1] Sun Yat Sen Univ, MOE Lab Bioinorgan & Synthet Chem, State Key Lab Optoelect Mat & Technol, Lehn Inst Funct Mat,Sch Chem & Chem Engn, Guangzhou 510275, Guangdong, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Organ Chem, State Key Lab Organometall Chem, Shanghai 200032, Peoples R China
关键词
coordination cages; coordination modes; palladium; photochromism; supramolecular gels; METAL-ORGANIC FRAMEWORK; BUILDING-BLOCKS SBBS; DRUG-DELIVERY; ORGANOGELS; VESICLES; MOLECULES; DISCRETE; CAGES; POLYMER; ENCAPSULATION;
D O I
10.1002/chem.201406517
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Creating cavities in varying levels, from molecular containers to macroscopic materials of porosity, have long been motivated for biomimetic or practical applications. Herein, we report an assembly approach to multiresponsive supramolecular gels by integrating photochromic metal-organic cages as predefined building units into the supramolecular gel skeleton, providing a new approach to create cavities in gels. Formation of discrete O-Pd2L4 cages is driven by coordination between Pd2+ and a photochromic dithienylethene bispyridine ligand (O-PyFDTE). In the presence of suitable solvents (DMSO or MeCN/DMSO), the O-Pd2L4 cage molecules aggregate to form nanoparticles, which are further interconnected through supramolecular interactions to form a three-dimensional (3D) gel matrix to trap a large amount of solvent molecules. Light-induced phase and structural transformations readily occur owing to the reversible photochromic open-ring/closed-ring isomeric conversion of the cage units upon UV/visible light radiation. Furthermore, such Pd2L4 cage-based gels show multiple reversible gel-solution transitions when thermal-, photo-, or mechanical stimuli are applied. Such supramolecular gels consisting of porous molecules may be developed as a new type of porous materials with different features from porous solids.
引用
收藏
页码:7418 / 7427
页数:10
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