每周分享：Direct visualization of a guest-triggered crystal deformation based on a flexible ultramicroporous framework

       今天给大家分享的是2013年9月份《Nature Communications》上发表的一篇名为：Direct visualization of a guest-triggered crystal deformation based on a flexible ultramicroporous framework的文章，文章摘要如下：

Host–guest composites may exhibit abnormal and/or controllable physical properties that are unavailable for traditional solids. However, it is still very difficult to control or visualize the occupancy and motion of the guest. Here we report a flexible ultramicroporous coordination polymer showing exceptional guest-responsive thermal-expansion properties. The vacant crystal exhibits constant and huge thermal expansion over a wide temperature range not only in vacuum but also in air, as its ultramicroporous channel excludes air adsorption even at 77?K. More interestingly, as demonstrated by single-crystal X-ray crystallography, molecular dynamic simulations and solid-state nuclear magnetic resonance, it selectively responds to the molecular rearrangement of N,N-dimethylformamide, leading to conformation reversion of the flexible ligand, which transfers these actions to deform the whole crystal lattice. These results illustrate that combination of ultramicroporous channel and flexible pore surface could be an effective strategy for the utilization of external physical and chemical stimuli。

       该文章中材料表征采用的是美国麦克仪器ASAP 2020，使用该仪器获得材料氮气吸附脱附等温线。

详情可参考下面链接：

http://www.nature.com/ncomms/2013/130926/ncomms3534/full/ncomms3534.html?WT.ec_id=NCOMMS-20131001

网站地图