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苏志教授在CHEMICAL SCIENCE发表研究论文

发布时间:17-12-19 16:42:54 文章来源:化科院 浏览次数: [ 字号:


Bond breakage under pressure in a metal organic framework
Su, Z (Su, Zhi)[ 1,2 ](苏志); Miao, YR (Miao, Yu-Run)[ 1 ] ; Zhang, GH (Zhang, Guanghui)[ 3 ] ; Miller, JT (Miller, Jeffrey T.)[ 3 ] ; Suslick, KS (Suslick, Kenneth S.)[ 1 ]*

[ 1 ] Univ Illinois, Dept Chem, 1209 W Calif St, Urbana, IL 61801 USA
[ 2 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Nanjing 210023, Jiangsu, Peoples R China
[ 3 ] Purdue Univ, Davidson Sch Chem Engn, W Lafayette, IN 47907 USA

CHEMICAL SCIENCE,201712,8(12),8004-8011

The internal free volume of porous materials diminishes upon mechanical compression, and such volume collapse can have chemical consequences. We report here the endothermic bond breakage in a metal-organic framework (MOF) during compression-induced collapse. Upon bulk compression at 1.9 GPa, the effective number for Zr-O bonds between Zr(IV) ions and carboxylate groups in UiO-66 decreased from 4.0 to 1.9, as determined by EXAFS, and the internal free volume was synchronously collapsed. Consistent with the EXAFS data, IR spectra confirmed conversion of syn-syn bridging carboxylates to monodentate ligation, thus establishing mechanochemical reactions induced by external compression of MOFs. Substantial mechanical energy (similar to 4 kJ g(-1)) was absorbed by UiO-66 nanocrystals during compression, as demonstrated from nanocompression of single crystals (600 nm) in situ during scanning electron microscopy, which establishes the potential application of MOFs as mechanical energy absorbers for hydrostatic and shock compression.


文章链接:
http://pubs.rsc.org/en/Content/ArticleLanding/2017/SC/C7SC03786D#!divAbstract
 


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