A supramolecular compound, [ Co（2,2＇-bipy） （ H2O）4 ] [ trans-1,4-chdc ] （ compound 1 ） （ 2,2＇-bipy = 2,2＇- bipyridine, 1,4-chdcH2 = 1,4-cyclohexanedicarboxylic acid）, was synthesized and characterized by si...A supramolecular compound, [ Co（2,2＇-bipy） （ H2O）4 ] [ trans-1,4-chdc ] （ compound 1 ） （ 2,2＇-bipy = 2,2＇- bipyridine, 1,4-chdcH2 = 1,4-cyclohexanedicarboxylic acid）, was synthesized and characterized by single-crystal Xray diffraction analysis, IR spectrometry, TG analysis, and elemental analyses. Single-crystal X-ray diffraction analysis revealed that [ Co（ 2,2＇-bipy） （ H2O）4 ]^2＋ units and adjacent 1,4-chdc^2- formed a single layer by hydrogen bonding and electrostatic interactions along the ac-plane, and two symmetry-related single layers interacted with each other by hydrogen bonding, resulting in a double layer, which further formed a 3-D structure by π-π stacking. The most attractive structural feature of compound 1 is that 1,4-chdc2- possesses only tram-conformation although there are both c/s- and tram-conformations in the raw material.展开更多
Untargeted metabolomics aims to comprehensively profile metabolites as many as possible in biological samples.Recently,ion mobility-mass spectrometry(IM-MS)has emerged as a powerful technology for untargeted metabolom...Untargeted metabolomics aims to comprehensively profile metabolites as many as possible in biological samples.Recently,ion mobility-mass spectrometry(IM-MS)has emerged as a powerful technology for untargeted metabolomics.The emerging role of IM-MS in untargeted metabolomics enables the separation of metabolite isomers and generation of multidimension data to support the identification of metabolites.In this review,we first introduced the basic principles of IM-MS instruments commonly used for untargeted metabolomics.Then,we demonstrated the application of IM-MS for metabolite separation and identification of both known and unknown metabolites.Finally,we discussed the future developments of IM-MS technology to improve untargeted metabolomics.展开更多
The synthesis of nanoporous materials that display a combination of molecular sieving(MS)and quantum sieving(QS)effects is still a challenging task.In this work,we have demonstrated the synthesis of a nanocaged metal...The synthesis of nanoporous materials that display a combination of molecular sieving(MS)and quantum sieving(QS)effects is still a challenging task.In this work,we have demonstrated the synthesis of a nanocaged metal–organic framework(MOF),ECUT-8,that has a dual-sieving capability.ECUT-8 afforded H_(2)/D_(2) isotope separation due to its extremely narrow window size(3.0Å),resulting in QS.Further,the framework flexibility of ECUT-8 was exploited for the separation of butane and hexane isomers due to its MS effect.Other desirable features of ECUT-8 include high thermal,water,and chemical stability,making it suitable for practical application.Herein,these results open up an avenue to design the effects of coexistence of multiple sieving in one material.展开更多
基金Supported by the National Natural Science Foundation of China (No. 20571014) and the Scientific Research Foundation forReturned Overseas Chinese Scholars, the Ministry of Education of China
文摘A supramolecular compound, [ Co（2,2＇-bipy） （ H2O）4 ] [ trans-1,4-chdc ] （ compound 1 ） （ 2,2＇-bipy = 2,2＇- bipyridine, 1,4-chdcH2 = 1,4-cyclohexanedicarboxylic acid）, was synthesized and characterized by single-crystal Xray diffraction analysis, IR spectrometry, TG analysis, and elemental analyses. Single-crystal X-ray diffraction analysis revealed that [ Co（ 2,2＇-bipy） （ H2O）4 ]^2＋ units and adjacent 1,4-chdc^2- formed a single layer by hydrogen bonding and electrostatic interactions along the ac-plane, and two symmetry-related single layers interacted with each other by hydrogen bonding, resulting in a double layer, which further formed a 3-D structure by π-π stacking. The most attractive structural feature of compound 1 is that 1,4-chdc2- possesses only tram-conformation although there are both c/s- and tram-conformations in the raw material.
基金The work was supported by National Natural Science Foundation of China(Grant No.31971356)Shang-hai Municipal Science and Technology Major Project(Grant No.2019SHZDZX02)。
文摘Untargeted metabolomics aims to comprehensively profile metabolites as many as possible in biological samples.Recently,ion mobility-mass spectrometry(IM-MS)has emerged as a powerful technology for untargeted metabolomics.The emerging role of IM-MS in untargeted metabolomics enables the separation of metabolite isomers and generation of multidimension data to support the identification of metabolites.In this review,we first introduced the basic principles of IM-MS instruments commonly used for untargeted metabolomics.Then,we demonstrated the application of IM-MS for metabolite separation and identification of both known and unknown metabolites.Finally,we discussed the future developments of IM-MS technology to improve untargeted metabolomics.
基金supported financially by the National Natural Science Foundations of China(nos.21966002,21871047,and 21861017)the Natural Science Foundation of Jiangxi Province of China(no.20181ACB20003)the Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province(no.20194BCJ22010).
文摘The synthesis of nanoporous materials that display a combination of molecular sieving(MS)and quantum sieving(QS)effects is still a challenging task.In this work,we have demonstrated the synthesis of a nanocaged metal–organic framework(MOF),ECUT-8,that has a dual-sieving capability.ECUT-8 afforded H_(2)/D_(2) isotope separation due to its extremely narrow window size(3.0Å),resulting in QS.Further,the framework flexibility of ECUT-8 was exploited for the separation of butane and hexane isomers due to its MS effect.Other desirable features of ECUT-8 include high thermal,water,and chemical stability,making it suitable for practical application.Herein,these results open up an avenue to design the effects of coexistence of multiple sieving in one material.
