Formation Mechanism and Reversible Expansion and Shrinkage of Magnesium-Based Homochiral Metal-Organic Nanotubes
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- 作者：Min Liu ; Dr. Jian-Shen Feng ; Dr. Song-Song Bao and Prof. Dr. Li-Min Zheng
- 刊名：Chemistry - A European Journal
- 出版年：2017
- 出版时间：January 23, 2017
- 年：2017
- 卷：23
- 期：5
- 页码：1086-1092
- 全文大小：3386K
- ISSN：1521-3765
文摘
Two pairs of homochiral magnesium phosphonates, namely (R)-, (S)-[Mg(pemp)(H2O)2] (1) and (R)-, (S)-Mg10(pemp)10(H2O)10]⋅3 H2O (2) are reported (pemp2−=(R)- or (S)-(1-phenylethylamino) methylphosphonate). Compounds 1 show one-dimensional tubular structures. The tube wall is purely inorganic, containing six-membered rings made up of corner-sharing {MgO5N} octahedra and {PO3C} tetrahedra. The organic groups reside outside the tube. A bottom-up “direct growing” mechanism is proposed for the formation of the nanotubular structures of 1, based on the electrospray ionization mass spectrometry studies. Compounds 2 display two-dimensional layered structures containing cross-linked squashed nanotubes. Interestingly, the two structures can interconvert reversibly upon temperature and pH modulation. This is the first report of a metal–organic nanotube that can shrink and recover in a reversible manner.