Metal–Organic Frameworks(MOFs)as effective catalysts can contribute to the effective green conversion of CO_(2).However,more studies have focused on the conversion of epoxides to cyclic carbonate systems,but the equa...Metal–Organic Frameworks(MOFs)as effective catalysts can contribute to the effective green conversion of CO_(2).However,more studies have focused on the conversion of epoxides to cyclic carbonate systems,but the equally important conversion of oxazolidinones has been rarely addressed.In general,the catalysts required for such reactions have to combine multiple different types of catalytic sites and synergistic effects at the same time.展开更多
Crystalline materials with well-defined structures and ordered molecular arrays can provide a new research platform to fabricate new smart materials with excellent stimulus response properties.Among them,Luminescent M...Crystalline materials with well-defined structures and ordered molecular arrays can provide a new research platform to fabricate new smart materials with excellent stimulus response properties.Among them,Luminescent Metal-Organic Frameworks(LMOFs)and Hydrogen-bonding Organic Frameworks(HOFs)show great promise for fluorescence detection to different pollutants.In order to further extend the smart sensing frameworks and enhance the relevant sensing performance,the present work specifically selects 4,4',4",4(")-([6,6'-biquinoxaline]-2,2',3,3'-tetrayl)tetrabenzoic acid(H4L)consisting of the bisquinoxaline functional group as an optical response group,and HOF(HUST-25,HUST=Huazhong University of Science and Technology),Zn-MOF(HUST-26),and Cd-MOF(HUST-27)were successfully obtained.HOF could achieve the fluorescence recognition of Fe^(3+),MnO_(4)^(-),Cr_(2)O_(7)^(2-),p-nitrotoluene(4-NP),2,4,6-trinitrotoluene(TNP)and metronidazole(MDZ).The detection range of Zn-MOF constructed using Zn ions was similar to that of HOF,but the detection sensitivity of metal cations was significantly improved.Although Cd-MOF formed a six-fold interpenetrating structure,it was still able to retain a large pore structure.The dense stacking structure increases the quinoxaline density,which effectively expanded the sensitivity and detection range of fluorescence sensing.Therefore,Cd-MOF showed better detection for nitro explosives,antibiotics,and organic small molecules with ketone groups.For example,compared to the previous literatures,Cd-MOF has a larger Ksv value for the nitro-explosive nitrobenzene(NB),indicating the very high detection sensitivity.The series frameworks can present excellent sensing properties mainly because the func-tional primitives can be uniformly distributed in the skeleton of the crystalline materials,forming an ordered molecular array that enables the efficient energy transfer between the external stimulus signal and the response function sites.The related results indicate that the introduction of bisquinoxaline groups with a large degree of conjugation and excellent optical properties into the frameworks can be one of the effective strategies to construct highly sensitive and universal fluorescence sensing crystalline materials.展开更多
基金the National Natural Science Foundation of China(Grants 92161123,21971078)the Frontier Project of Application Foundation of Wuhan Science and Technology Bureau of China(Grant No.2020010601012201)We gratefully acknowledge the Analytical and Testing Center,the Huazhong University of Science and Technology,for analysis and spectral measurements.We also thank the staff from the BL17B beamline of the National Center for Protein Sciences Shanghai(NCPSS)at Shanghai Synchrotron Radiation Facility for assistance during data collection.
文摘Metal–Organic Frameworks(MOFs)as effective catalysts can contribute to the effective green conversion of CO_(2).However,more studies have focused on the conversion of epoxides to cyclic carbonate systems,but the equally important conversion of oxazolidinones has been rarely addressed.In general,the catalysts required for such reactions have to combine multiple different types of catalytic sites and synergistic effects at the same time.
基金the National Natural Science Foundation of China(No.92161123,21971078)the Frontier Project of Application Foundation of Wuhan Science and Technology Bureau of China(No.2020010601012201).
文摘Crystalline materials with well-defined structures and ordered molecular arrays can provide a new research platform to fabricate new smart materials with excellent stimulus response properties.Among them,Luminescent Metal-Organic Frameworks(LMOFs)and Hydrogen-bonding Organic Frameworks(HOFs)show great promise for fluorescence detection to different pollutants.In order to further extend the smart sensing frameworks and enhance the relevant sensing performance,the present work specifically selects 4,4',4",4(")-([6,6'-biquinoxaline]-2,2',3,3'-tetrayl)tetrabenzoic acid(H4L)consisting of the bisquinoxaline functional group as an optical response group,and HOF(HUST-25,HUST=Huazhong University of Science and Technology),Zn-MOF(HUST-26),and Cd-MOF(HUST-27)were successfully obtained.HOF could achieve the fluorescence recognition of Fe^(3+),MnO_(4)^(-),Cr_(2)O_(7)^(2-),p-nitrotoluene(4-NP),2,4,6-trinitrotoluene(TNP)and metronidazole(MDZ).The detection range of Zn-MOF constructed using Zn ions was similar to that of HOF,but the detection sensitivity of metal cations was significantly improved.Although Cd-MOF formed a six-fold interpenetrating structure,it was still able to retain a large pore structure.The dense stacking structure increases the quinoxaline density,which effectively expanded the sensitivity and detection range of fluorescence sensing.Therefore,Cd-MOF showed better detection for nitro explosives,antibiotics,and organic small molecules with ketone groups.For example,compared to the previous literatures,Cd-MOF has a larger Ksv value for the nitro-explosive nitrobenzene(NB),indicating the very high detection sensitivity.The series frameworks can present excellent sensing properties mainly because the func-tional primitives can be uniformly distributed in the skeleton of the crystalline materials,forming an ordered molecular array that enables the efficient energy transfer between the external stimulus signal and the response function sites.The related results indicate that the introduction of bisquinoxaline groups with a large degree of conjugation and excellent optical properties into the frameworks can be one of the effective strategies to construct highly sensitive and universal fluorescence sensing crystalline materials.
