The development of new stimuli-responsive materials with controllable properties has been highly desirable in the past decade owing to their increasing application demand in various areas.In this work,two tripyridyl-t...The development of new stimuli-responsive materials with controllable properties has been highly desirable in the past decade owing to their increasing application demand in various areas.In this work,two tripyridyl-triazine-based zinc bromide complexes,[ZnBr_(2)(2-TPT)](1)and[ZnBr_(2)(2-TPT)]·C_(6)H_(5)CH_(2)OH(2)(2-TPT=2,4,6-tri(2-pyridyl)-1,3,5-triazine),have been prepared through the solvent evaporation method,and exhibit lattice solvent controlled photochromic performance in the crystalline state as well as solvent-induced photochromism in the solution state.Furthermore,the two complexes display tunable photochromic and photoluminescence properties in the crystalline state through the reversible desorption-adsorption of lattice benzyl alcohol molecules.Crystalline 1 and 2 are very sensitive to triple photostimulation(sunlight,ultraviolet light and X-ray irradiation)and exhibit excellent photochromic behaviors with distinct coloration contrast(light blue for 1vs.deep blue for 2),which is ascribed to different supramolecular frameworks via weak interactions(lone pair-πandπ⋯πinteractions).Meanwhile,crystalline 1 and 2 also exhibit completely different quenching efficiency during the coloration-decoloration processes,which is a typical example of a photo-stimuli dual-output responsive system and could be potentially applied in optical switches.The photochromic mechanism of photoinduced intermolecular electron transfer(PIET)has been carefully verified by the combination of experimental and theoretical investigations.展开更多
Allylic amines and 1,3-oxazinanes are valuable molecular skeletons in organic synthesis and pharmaceutical industry.A straightforward way to such two types of compounds by solvent-controlled rare-earth metal Lewis aci...Allylic amines and 1,3-oxazinanes are valuable molecular skeletons in organic synthesis and pharmaceutical industry.A straightforward way to such two types of compounds by solvent-controlled rare-earth metal Lewis acid-catalyzed transformations of 2-(hetero)aryl-N-sulfonylazetidines:the ring-opening isomerization of azetidines to allylic amines and the annulation of azetidines with aldehydes to 1,3-oxazinanes are reported.These two reactions feature scalability,low catalyst loading,mild reaction conditions,excellent yields and regioselectivity with demonstrated utility in three-step product transformations to naftifine,abamine and abamine SG.展开更多
Methods for promoting product and reducing energy consumption in a solvent dewaxing device are putforward.Then,the authors mainly discuss about adaptive database,mathematical modeling,mathematical op-timized control a...Methods for promoting product and reducing energy consumption in a solvent dewaxing device are putforward.Then,the authors mainly discuss about adaptive database,mathematical modeling,mathematical op-timized control algorithm,expert optimized control system and intelligent alarming system etc.At last,hard-ware and software of the intelligent optimized control system are introduced.Field test is finally chosen for thisstudy and proved that the intelligent optimized control system is effective.展开更多
The mixed-alkali-metal borates NaK(B_(5)O_(8))(OH)·H2O(1),NaK_(6)[(B_(4)O_(5))(OH)_(4)]3(OH)·C_(2)H_(5)OH(2)and Na_(0.33)K_(1.67)(B_(4)O_(5))(OH)_(4)·3H_(2)O(3)have been solvothermally synthesized using...The mixed-alkali-metal borates NaK(B_(5)O_(8))(OH)·H2O(1),NaK_(6)[(B_(4)O_(5))(OH)_(4)]3(OH)·C_(2)H_(5)OH(2)and Na_(0.33)K_(1.67)(B_(4)O_(5))(OH)_(4)·3H_(2)O(3)have been solvothermally synthesized using various polar organic solvents.Compounds 1 and 2 crystallize in the centrosymmetric space groups P1¯and R3¯c,respectively.展开更多
Highly symmetrical molecules with beautiful geometries are ubiquitous in nature.It has inspired creative ideas of the perfect combination of geometry and molecular structural chemistry.Some metal clusters with regular...Highly symmetrical molecules with beautiful geometries are ubiquitous in nature.It has inspired creative ideas of the perfect combination of geometry and molecular structural chemistry.Some metal clusters with regular geometric polyhedra have been reported,but such highly symmetric polyhedra for Al-oxo clusters are really scarce on account of the fast hydrolysis of Al^(3+)ions.Herein,a[Al_(12)(CH_(3)O)_(24)(NAP)_(12)]·4DMF·2H_(2)O·2CH_(3)OH(Al_(12),NAP−=2-naphthoic acid)nanoring was synthesized by the solvothermal reaction of AlCl_(3)·6H_(2)O,2-naphthoformic acid(HNAP)and triethylamine(Et_(3)N)in CH_(3)OH and DMF.Interestingly,the regulation from ring-shaped Al_(12) to[Al_(24)(OH)_(32)(CH_(3)O)_(22)(CH_(3)OH)_(2)(NAP)_(12)]·6Cl·2H_(2)O·2CH_(3)OH(Al_(24))metallocage is realized by only changing the reactive solvents.The Al_(24)metallocage can be seen as one of 13 Archimedean polyhedra,a truncated cube composed of eight Al_(3) triangles and six Al_(8) octagons by sharing vertical Al^(3+)ions.In addition,highresolution electrospray ionization mass spectrometry(HR-ESI-MS)reveals that the metallic skeletons of Al_(12) and Al_(24)can be maintained stable in CH_(3)OH and CH_(2)Cl_(2).Furthermore,Al_(12) and Al_(24)emit blue luminescence and exhibit photocurrent responses under LED light illumination.展开更多
Extractive distillation is an effective method for separating azeotropic or close boiling point mixtures by adding a third component.Various technologies for performing the extractive distillation process have been ex...Extractive distillation is an effective method for separating azeotropic or close boiling point mixtures by adding a third component.Various technologies for performing the extractive distillation process have been explored to protect the environment and save resources.This paper focuses on the improvement of these advanced technologies in recent years.Extractive distillation is retrieved and analyzed from the view of phase equilibrium,selection of solvent in extractive distillation,process design,energy conservation,and dynamic control.The quantitative structure–property relationship used in extractive distillation is discussed,and the future development of extractive distillation is proposed to determine how the solvent affects the relative volatility of the separated mixture.In the steady state design,the relationship between the curvature of the residue curve and parameters of the optimal steady state is also highlighted as another field worthy of further study to simplify the distillation process.展开更多
基金National Natural Science Foundation of China(NSFC-21171110)Natural Science Foundation of Science and Technology Agency of Shanxi Province(201901D111275)+1 种基金Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi(2020CG032)1331 Project of Shanxi Province.
文摘The development of new stimuli-responsive materials with controllable properties has been highly desirable in the past decade owing to their increasing application demand in various areas.In this work,two tripyridyl-triazine-based zinc bromide complexes,[ZnBr_(2)(2-TPT)](1)and[ZnBr_(2)(2-TPT)]·C_(6)H_(5)CH_(2)OH(2)(2-TPT=2,4,6-tri(2-pyridyl)-1,3,5-triazine),have been prepared through the solvent evaporation method,and exhibit lattice solvent controlled photochromic performance in the crystalline state as well as solvent-induced photochromism in the solution state.Furthermore,the two complexes display tunable photochromic and photoluminescence properties in the crystalline state through the reversible desorption-adsorption of lattice benzyl alcohol molecules.Crystalline 1 and 2 are very sensitive to triple photostimulation(sunlight,ultraviolet light and X-ray irradiation)and exhibit excellent photochromic behaviors with distinct coloration contrast(light blue for 1vs.deep blue for 2),which is ascribed to different supramolecular frameworks via weak interactions(lone pair-πandπ⋯πinteractions).Meanwhile,crystalline 1 and 2 also exhibit completely different quenching efficiency during the coloration-decoloration processes,which is a typical example of a photo-stimuli dual-output responsive system and could be potentially applied in optical switches.The photochromic mechanism of photoinduced intermolecular electron transfer(PIET)has been carefully verified by the combination of experimental and theoretical investigations.
文摘Allylic amines and 1,3-oxazinanes are valuable molecular skeletons in organic synthesis and pharmaceutical industry.A straightforward way to such two types of compounds by solvent-controlled rare-earth metal Lewis acid-catalyzed transformations of 2-(hetero)aryl-N-sulfonylazetidines:the ring-opening isomerization of azetidines to allylic amines and the annulation of azetidines with aldehydes to 1,3-oxazinanes are reported.These two reactions feature scalability,low catalyst loading,mild reaction conditions,excellent yields and regioselectivity with demonstrated utility in three-step product transformations to naftifine,abamine and abamine SG.
基金Supported by the Eighth Five Year plan Research Program(No.85-720-10-21).
文摘Methods for promoting product and reducing energy consumption in a solvent dewaxing device are putforward.Then,the authors mainly discuss about adaptive database,mathematical modeling,mathematical op-timized control algorithm,expert optimized control system and intelligent alarming system etc.At last,hard-ware and software of the intelligent optimized control system are introduced.Field test is finally chosen for thisstudy and proved that the intelligent optimized control system is effective.
基金financially supported by the National Natural Science Foundation of China(no.51432006,50925207,and 51172100)the Ministry of Science and Technology of China(no.2011DFG52970)+1 种基金the Ministry of Education of China for the Changjiang Innovation Research Team(no.IRT13R24)the Ministry of Education and the State Administration of Foreign Experts Affairs for the 111 Project(no.B13025).M.G.H.and C.Z.thank the Australian Research Council for support.
文摘The mixed-alkali-metal borates NaK(B_(5)O_(8))(OH)·H2O(1),NaK_(6)[(B_(4)O_(5))(OH)_(4)]3(OH)·C_(2)H_(5)OH(2)and Na_(0.33)K_(1.67)(B_(4)O_(5))(OH)_(4)·3H_(2)O(3)have been solvothermally synthesized using various polar organic solvents.Compounds 1 and 2 crystallize in the centrosymmetric space groups P1¯and R3¯c,respectively.
基金supported by the National Natural Science Foundation of China(no.22101148)the Natural Science Foundation of Shandong Province(no.ZR2021QB008).
文摘Highly symmetrical molecules with beautiful geometries are ubiquitous in nature.It has inspired creative ideas of the perfect combination of geometry and molecular structural chemistry.Some metal clusters with regular geometric polyhedra have been reported,but such highly symmetric polyhedra for Al-oxo clusters are really scarce on account of the fast hydrolysis of Al^(3+)ions.Herein,a[Al_(12)(CH_(3)O)_(24)(NAP)_(12)]·4DMF·2H_(2)O·2CH_(3)OH(Al_(12),NAP−=2-naphthoic acid)nanoring was synthesized by the solvothermal reaction of AlCl_(3)·6H_(2)O,2-naphthoformic acid(HNAP)and triethylamine(Et_(3)N)in CH_(3)OH and DMF.Interestingly,the regulation from ring-shaped Al_(12) to[Al_(24)(OH)_(32)(CH_(3)O)_(22)(CH_(3)OH)_(2)(NAP)_(12)]·6Cl·2H_(2)O·2CH_(3)OH(Al_(24))metallocage is realized by only changing the reactive solvents.The Al_(24)metallocage can be seen as one of 13 Archimedean polyhedra,a truncated cube composed of eight Al_(3) triangles and six Al_(8) octagons by sharing vertical Al^(3+)ions.In addition,highresolution electrospray ionization mass spectrometry(HR-ESI-MS)reveals that the metallic skeletons of Al_(12) and Al_(24)can be maintained stable in CH_(3)OH and CH_(2)Cl_(2).Furthermore,Al_(12) and Al_(24)emit blue luminescence and exhibit photocurrent responses under LED light illumination.
基金Supported by the National Natural Science Foundation of China(21676152)
文摘Extractive distillation is an effective method for separating azeotropic or close boiling point mixtures by adding a third component.Various technologies for performing the extractive distillation process have been explored to protect the environment and save resources.This paper focuses on the improvement of these advanced technologies in recent years.Extractive distillation is retrieved and analyzed from the view of phase equilibrium,selection of solvent in extractive distillation,process design,energy conservation,and dynamic control.The quantitative structure–property relationship used in extractive distillation is discussed,and the future development of extractive distillation is proposed to determine how the solvent affects the relative volatility of the separated mixture.In the steady state design,the relationship between the curvature of the residue curve and parameters of the optimal steady state is also highlighted as another field worthy of further study to simplify the distillation process.
