The efficient separation of styrene(ST)and ethylbenzene(EB)remains a significant challenge in the petrochemical industry due to their similar physical properties and kinetic molecular sizes.In this study,we cleverly u...The efficient separation of styrene(ST)and ethylbenzene(EB)remains a significant challenge in the petrochemical industry due to their similar physical properties and kinetic molecular sizes.In this study,we cleverly utilized the voids of a fluorescent flexible hydrogen-bonded organic framework(X-HOF-10)constructed from a pure organic phenothiazine derivative with three cyano groups(PTTCN)to selectively adsorb and separate ST and EB based on their slight size difference.Single crystal structure analysis and fluorescence spectra reveal that the adsorption process of ST involves a gate-opening mechanism accompanied by a fluorescent color switch behavior.Upon simple heating,ST can be released from the voids through a gate-closing process.Conversely,exposure to EB vapor does not promote X-HOF-10a to adsorb EB due to its slightly larger size in comparison with ST,facilitating a single crystal to single crystal transition,leading to the formation of a new non-porous crystal without EB.Under equimolar vapor condition,X-HOF-10a transforms into X-HOF-10 rather than X-HOF-11 owing to the superior stability of X-HOF-10over X-HOF-11,accompanied by selective adsorption of ST.The purity of ST can reach 92%after release from the framework,which further increases to over 98%when exposed to the mixed vapor containing 90%ST.Additionally,this HOF material exhibits recyclability without any discernible loss in performance.展开更多
Thank you once again for the floor,and for the opportunity to share some thoughts with you.I want to share a story of two parallel journeys,two parallel transformations.The transformation of the role of information,an...Thank you once again for the floor,and for the opportunity to share some thoughts with you.I want to share a story of two parallel journeys,two parallel transformations.The transformation of the role of information,and the transformation of the role of libraries.Transformations that also matter crucially for IFLA,for the global library field,because they demand a transformation of us as well.展开更多
A flexible metal-organic framework of la Cu（FMA）（4,4＇-Bpe）0.s （FMA=fumarate; 4,4＇Bpe=trans-bis-（4-pyridyl）ethylene） that exhibits vip molecule-controlled gate-opening adsorption has been reported, in which...A flexible metal-organic framework of la Cu（FMA）（4,4＇-Bpe）0.s （FMA=fumarate; 4,4＇Bpe=trans-bis-（4-pyridyl）ethylene） that exhibits vip molecule-controlled gate-opening adsorption has been reported, in which the flexible pores can be enlarged by CO2 molecules rather than CH4 and N2 under a certain gate-opening pressure. The CO2 uptake can be sharply improved from 6.85 cm3 gq at 0.60 atm to 33.7 cm3 g^-1 at 1 atm due to the gate-opening effect, thus resulting in the notably enhanced adsorption selectivities for CO2/CH4 （32：1, v/v） and CO2/N2 （48：1, v/v） separations at room temperature.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 Scientific Research Foundation of Tianjin Normal University(No.5RL151)the Tianjin Research Innovation Project for Postgraduate Students(No.2022SKY252)+1 种基金the National Natural Science Foundation of China(NSFC,Nos.22265026,22002108)the Project of Qinghai Science&Technology Department(No.2024-ZJ-935)。
文摘The efficient separation of styrene(ST)and ethylbenzene(EB)remains a significant challenge in the petrochemical industry due to their similar physical properties and kinetic molecular sizes.In this study,we cleverly utilized the voids of a fluorescent flexible hydrogen-bonded organic framework(X-HOF-10)constructed from a pure organic phenothiazine derivative with three cyano groups(PTTCN)to selectively adsorb and separate ST and EB based on their slight size difference.Single crystal structure analysis and fluorescence spectra reveal that the adsorption process of ST involves a gate-opening mechanism accompanied by a fluorescent color switch behavior.Upon simple heating,ST can be released from the voids through a gate-closing process.Conversely,exposure to EB vapor does not promote X-HOF-10a to adsorb EB due to its slightly larger size in comparison with ST,facilitating a single crystal to single crystal transition,leading to the formation of a new non-porous crystal without EB.Under equimolar vapor condition,X-HOF-10a transforms into X-HOF-10 rather than X-HOF-11 owing to the superior stability of X-HOF-10over X-HOF-11,accompanied by selective adsorption of ST.The purity of ST can reach 92%after release from the framework,which further increases to over 98%when exposed to the mixed vapor containing 90%ST.Additionally,this HOF material exhibits recyclability without any discernible loss in performance.
文摘Thank you once again for the floor,and for the opportunity to share some thoughts with you.I want to share a story of two parallel journeys,two parallel transformations.The transformation of the role of information,and the transformation of the role of libraries.Transformations that also matter crucially for IFLA,for the global library field,because they demand a transformation of us as well.
基金supported by an award AX-1730 from the Welch Foundation (BC)
文摘A flexible metal-organic framework of la Cu（FMA）（4,4＇-Bpe）0.s （FMA=fumarate; 4,4＇Bpe=trans-bis-（4-pyridyl）ethylene） that exhibits vip molecule-controlled gate-opening adsorption has been reported, in which the flexible pores can be enlarged by CO2 molecules rather than CH4 and N2 under a certain gate-opening pressure. The CO2 uptake can be sharply improved from 6.85 cm3 gq at 0.60 atm to 33.7 cm3 g^-1 at 1 atm due to the gate-opening effect, thus resulting in the notably enhanced adsorption selectivities for CO2/CH4 （32：1, v/v） and CO2/N2 （48：1, v/v） separations at room temperature.
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.
