The ring has been a romantic fascination throughout the ages,embodying not only beauty and order but also harboring numerous undisclosed properties awaiting discovery.In the realm of supramolecular chemistry,macrocycl...The ring has been a romantic fascination throughout the ages,embodying not only beauty and order but also harboring numerous undisclosed properties awaiting discovery.In the realm of supramolecular chemistry,macrocycles,with a cyclic structure and a central cavity like a doughnut,captivate the attention of scientists[1].In 1967,Pedersen's groundbreaking revelation that alkali metal ions could"fall into"the cavities of a cyclic ether named crown ether,even in organic solvents,unveiled a novel universe of macrocycle chemistry.Since then,numerous macrocyclic structures in nature have been discovered,isolated,and scrutinized.Drawing inspiration from nature,chemists endeavor to explore the vast potential of macrocyclic compounds by designing and synthesizing artificial macrocycles with diverse structural features and recognition properties.展开更多
Inclusion complexes of nitro-compounds using β-cyclodextrin and hydroxypropyl-β-cyclodextrin as host molecule have been studied by cyclic voltammetric method. The inclusion constants of the corresponding complexes h...Inclusion complexes of nitro-compounds using β-cyclodextrin and hydroxypropyl-β-cyclodextrin as host molecule have been studied by cyclic voltammetric method. The inclusion constants of the corresponding complexes have been determined. Strong inclusion complexation by hydroxypropyl-β-cyclodextrin has been verified展开更多
Reaction of p-t-butylcalix[6]arene with ethylene oxide gives a water soluble host compound with a hydrophobic cavity and it can include organic molecules and ions in aqueous solution.
Key intermediate bis[2-amino-4,5-(15-crown-5)phenyl]diselenide was obtained by the convenient redox method. Crown-ether type host molecule containing Se-Se bond 2,11-dioxo-4,5:8,9-di(benzo[4',5']-15-crown-5)-6...Key intermediate bis[2-amino-4,5-(15-crown-5)phenyl]diselenide was obtained by the convenient redox method. Crown-ether type host molecule containing Se-Se bond 2,11-dioxo-4,5:8,9-di(benzo[4',5']-15-crown-5)-6,7-diselena-3,10,16-triazabicyclo[10,3,1]hexadeca-1(16), 4, 8, 12, 14-pentaene was synthesized with high dillution technique.展开更多
A new phase transition compound,2-methoxyanilinium perchlorate-18-crown-6（1） {（oCH3OC6H4NH3）＋（18-crown-6） ClO4 },has been synthesized and separated as crystals.Differential scanning calorimetry（DSC） measureme...A new phase transition compound,2-methoxyanilinium perchlorate-18-crown-6（1） {（oCH3OC6H4NH3）＋（18-crown-6） ClO4 },has been synthesized and separated as crystals.Differential scanning calorimetry（DSC） measurements show a pair of sharp peaks at 225 K（heating） and 210 K（cooling）,indicating the phase transition is first-order.Dielectric anomalies observed at 225 K（heating）and 210 K（cooling） further confirm the phase transition.The crystal structures determined at 298 K and123 K are both triclinic in P 1.The most distinct difference between room-temperature and lowtemperature structures is the order–disorder transition of the host 18-crown-6 molecule,which is the driving force of the phase transition.展开更多
The design of host molecules capable of recognizing charged vips with high selectivity remains a central pursuit in supramolecular chemistry,underpinning advances in fields ranging from molecular sensing and ion tra...The design of host molecules capable of recognizing charged vips with high selectivity remains a central pursuit in supramolecular chemistry,underpinning advances in fields ranging from molecular sensing and ion transport to catalysis and biomimetic systems.At the heart of these efforts lies the strategic use of non-covalent interactions—forces that govern molecular recognition,guide self-assembly,and dictate functional performance[1].While hydrogen bonding has long dominated this space,a new class of highly directional and tunable interactions has emerged as a powerful alternative:theσ-hole interactions,particularly halogen bonding(XB)and chalcogen bonding(ChB).XB and ChB arise from anisotropic electron distributions on halogen(Group 17)and chalcogen(Group 16)atoms,where electron-withdrawing substituents create localized positive regions—σ-holes—capable of engaging in attractive interactions with Lewis bases[2,3].These interactions have rapidly gained prominence as precise molecular design tools,enabling breakthroughs in crystal engineering,self-assembled architectures,and organocatalysis.In the realm of anion recognition,XB and ChB donors often outperform traditional hydrogen-bond-based systems in both affinity and selectivity,highlighting their potential as next-generation supramolecular binding motifs[4,5].展开更多
The pursuit of high-performance narrowband blue organic light-emitting diodes(OLEDs)is of paramount importance in both academic research and industrial applications.While obvious strides have been made in the design o...The pursuit of high-performance narrowband blue organic light-emitting diodes(OLEDs)is of paramount importance in both academic research and industrial applications.While obvious strides have been made in the design of narrowband blue emitters,the development of appropriate host materials has evidently trailed behind.Herein,we introduce a medium-ring strategy for crafting host molecules based on the heptagonal tribenzo[b,d,f]azepine(TBA)unit.The twisted three-dimensional(3D)architecture of the TBA framework not only endows the host molecules with fast hole-transporting pathways but also effectively reduces exciton quenching.Equipped with two TBA units,DTBA,synthesized with ease,demonstrates a huge horizontal orientation factor(Θ//)of 93.5%and a broad emission spectrum for accelerating the energy transfer process in the emitting layer,which contributes to enhancing device performance.We have fabricated high-performance narrowband blue OLEDs using DTBA as the host,FIrpic as the phosphor sensitizer,and the widely used boron-nitrogen-containing multiple resonance emitter BCz-BN.These devices exhibit a maximum external quantum efficiency(EQEmax)as high as 31.0%with an impressively lowefficiency roll-off.Even at a high luminance level of 10,000 cd m^(-2),the EQE value remains noteworthy at 20.3%,marking a significant advancement in BCz-BN-based devices.展开更多
A series of monobridged calixarenes 3a-f, cyclic biscalix arenes 4a-f, diametrically bridged at the upper rim with saturated aliphatic diester chains, have been synthesized. The results at dilute conditions show tha...A series of monobridged calixarenes 3a-f, cyclic biscalix arenes 4a-f, diametrically bridged at the upper rim with saturated aliphatic diester chains, have been synthesized. The results at dilute conditions show that the percentage of yields of mono , bis and oligo calixarenes are related to the length of the chains. With the shortening of the chains, the percentage of monocalixarenes decreased. All the calixarene moieties are in a cone conformation according to the AB quartet pattern of the methylene protons between the phenolic rings in the 1H NMR spectra.展开更多
文摘The ring has been a romantic fascination throughout the ages,embodying not only beauty and order but also harboring numerous undisclosed properties awaiting discovery.In the realm of supramolecular chemistry,macrocycles,with a cyclic structure and a central cavity like a doughnut,captivate the attention of scientists[1].In 1967,Pedersen's groundbreaking revelation that alkali metal ions could"fall into"the cavities of a cyclic ether named crown ether,even in organic solvents,unveiled a novel universe of macrocycle chemistry.Since then,numerous macrocyclic structures in nature have been discovered,isolated,and scrutinized.Drawing inspiration from nature,chemists endeavor to explore the vast potential of macrocyclic compounds by designing and synthesizing artificial macrocycles with diverse structural features and recognition properties.
文摘Inclusion complexes of nitro-compounds using β-cyclodextrin and hydroxypropyl-β-cyclodextrin as host molecule have been studied by cyclic voltammetric method. The inclusion constants of the corresponding complexes have been determined. Strong inclusion complexation by hydroxypropyl-β-cyclodextrin has been verified
文摘Reaction of p-t-butylcalix[6]arene with ethylene oxide gives a water soluble host compound with a hydrophobic cavity and it can include organic molecules and ions in aqueous solution.
文摘Key intermediate bis[2-amino-4,5-(15-crown-5)phenyl]diselenide was obtained by the convenient redox method. Crown-ether type host molecule containing Se-Se bond 2,11-dioxo-4,5:8,9-di(benzo[4',5']-15-crown-5)-6,7-diselena-3,10,16-triazabicyclo[10,3,1]hexadeca-1(16), 4, 8, 12, 14-pentaene was synthesized with high dillution technique.
基金supported by the National Natural Science Foundation of China (No. 21101025)
文摘A new phase transition compound,2-methoxyanilinium perchlorate-18-crown-6（1） {（oCH3OC6H4NH3）＋（18-crown-6） ClO4 },has been synthesized and separated as crystals.Differential scanning calorimetry（DSC） measurements show a pair of sharp peaks at 225 K（heating） and 210 K（cooling）,indicating the phase transition is first-order.Dielectric anomalies observed at 225 K（heating）and 210 K（cooling） further confirm the phase transition.The crystal structures determined at 298 K and123 K are both triclinic in P 1.The most distinct difference between room-temperature and lowtemperature structures is the order–disorder transition of the host 18-crown-6 molecule,which is the driving force of the phase transition.
文摘The design of host molecules capable of recognizing charged vips with high selectivity remains a central pursuit in supramolecular chemistry,underpinning advances in fields ranging from molecular sensing and ion transport to catalysis and biomimetic systems.At the heart of these efforts lies the strategic use of non-covalent interactions—forces that govern molecular recognition,guide self-assembly,and dictate functional performance[1].While hydrogen bonding has long dominated this space,a new class of highly directional and tunable interactions has emerged as a powerful alternative:theσ-hole interactions,particularly halogen bonding(XB)and chalcogen bonding(ChB).XB and ChB arise from anisotropic electron distributions on halogen(Group 17)and chalcogen(Group 16)atoms,where electron-withdrawing substituents create localized positive regions—σ-holes—capable of engaging in attractive interactions with Lewis bases[2,3].These interactions have rapidly gained prominence as precise molecular design tools,enabling breakthroughs in crystal engineering,self-assembled architectures,and organocatalysis.In the realm of anion recognition,XB and ChB donors often outperform traditional hydrogen-bond-based systems in both affinity and selectivity,highlighting their potential as next-generation supramolecular binding motifs[4,5].
基金supported by the National Natural Science Foundation of China(22031007,22275127)。
文摘The pursuit of high-performance narrowband blue organic light-emitting diodes(OLEDs)is of paramount importance in both academic research and industrial applications.While obvious strides have been made in the design of narrowband blue emitters,the development of appropriate host materials has evidently trailed behind.Herein,we introduce a medium-ring strategy for crafting host molecules based on the heptagonal tribenzo[b,d,f]azepine(TBA)unit.The twisted three-dimensional(3D)architecture of the TBA framework not only endows the host molecules with fast hole-transporting pathways but also effectively reduces exciton quenching.Equipped with two TBA units,DTBA,synthesized with ease,demonstrates a huge horizontal orientation factor(Θ//)of 93.5%and a broad emission spectrum for accelerating the energy transfer process in the emitting layer,which contributes to enhancing device performance.We have fabricated high-performance narrowband blue OLEDs using DTBA as the host,FIrpic as the phosphor sensitizer,and the widely used boron-nitrogen-containing multiple resonance emitter BCz-BN.These devices exhibit a maximum external quantum efficiency(EQEmax)as high as 31.0%with an impressively lowefficiency roll-off.Even at a high luminance level of 10,000 cd m^(-2),the EQE value remains noteworthy at 20.3%,marking a significant advancement in BCz-BN-based devices.
文摘A series of monobridged calixarenes 3a-f, cyclic biscalix arenes 4a-f, diametrically bridged at the upper rim with saturated aliphatic diester chains, have been synthesized. The results at dilute conditions show that the percentage of yields of mono , bis and oligo calixarenes are related to the length of the chains. With the shortening of the chains, the percentage of monocalixarenes decreased. All the calixarene moieties are in a cone conformation according to the AB quartet pattern of the methylene protons between the phenolic rings in the 1H NMR spectra.
