It's urgent to develop benzocyclobutene(BCB)-based polymers with low curing temperature for temperature-sensitive applications such as liquid crystal displays(LCDs)and flexible electronics.Herein,the effect of sub...It's urgent to develop benzocyclobutene(BCB)-based polymers with low curing temperature for temperature-sensitive applications such as liquid crystal displays(LCDs)and flexible electronics.Herein,the effect of substituents on the ring-opening behavior of BCB derivatives was investigated.The ring-opening activation energy barriers(ΔGA)of BCB derivatives with one or two substituents on the four-membered alkyl ring were systematically calculated using the B3LYP function.Both mono-and di-substituted BCBs adopted the conrotatory ring-opening process,obeying the Woodward-Hoffmann's Rules upon heating.The mono-/di-substituted BCBs exhibited 8.2%—69%lowerΔGA compared with BCB,attributed to the electronic effects of the substituents.Disubstituted BCBs with both electron-donating and electron-withdrawing groups,e.g.,1-NH_(2)-8-NO_(2)-BCB,demonstrated the lowestΔGA.In addition,BCB derivatives with amide/ester/acyloxy group modified on C1 position were synthesized as model molecules,and their ring-opening temperature can be decreased by 20℃ compared to the unsubstituted one,also consistent with our calculation results.This work combined theoretical calculation methods with experimental results to provide valuable insights into the design and synthesis of BCB derivatives and next-generation BCB functional packaging materials with low ring-opening temperature.展开更多
Construction of crystalline homo/heteroaggregation at micro/nanometer level from organicπ-conjugated systems is of great importance because the controllable morphologies(i.e.,size,shape,and dimension)could provide di...Construction of crystalline homo/heteroaggregation at micro/nanometer level from organicπ-conjugated systems is of great importance because the controllable morphologies(i.e.,size,shape,and dimension)could provide diverse optoelectronic properties for different applications in the electrooptical devices.In this review,we summarize our recent progress in the self-assembly of micro/nanostructures of organicπ-conjugated molecules via the heteroaggregation and homoaggregation strategies.We also discuss various factors(i.e.,temperature,solvents,and surfactants)that affect the aggregation process through a surfactant-assisted reprecipitation method.Moreover,their physical properties and possible applications in electronics and biofields are illustrated.展开更多
A novel dimesityl-decorated bistetracene derivative 8,16-dimesityltetraceno[2,1,12,11-opqra]tetracene（DMTA） has been synthesized and characterized. Its single crystal analysis demonstrates that the parent bistetrace...A novel dimesityl-decorated bistetracene derivative 8,16-dimesityltetraceno[2,1,12,11-opqra]tetracene（DMTA） has been synthesized and characterized. Its single crystal analysis demonstrates that the parent bistetracene backbone is almost in a plane without any intermolecular 7 r-stacking interaction. DMTA exhibited the low-energy absorption at 560/607 nm and emission spectra at 617/663 nm, respectively.The fabricated device based on DMTA doping into 2,6-bis（3-（9 H-carbazol-9-yl）phenyl）pyridine（1 %） as an emitter present a maximum brightness of 632 cd/m^2 at 14.7 V with the CIE coordinate of（0.623,0.349）.展开更多
基金supported by the National Natural Science Foundation of China(Nos.22075298,2022000168)Beijing Municipal Natural Science Foundation(No,2212053).
文摘It's urgent to develop benzocyclobutene(BCB)-based polymers with low curing temperature for temperature-sensitive applications such as liquid crystal displays(LCDs)and flexible electronics.Herein,the effect of substituents on the ring-opening behavior of BCB derivatives was investigated.The ring-opening activation energy barriers(ΔGA)of BCB derivatives with one or two substituents on the four-membered alkyl ring were systematically calculated using the B3LYP function.Both mono-and di-substituted BCBs adopted the conrotatory ring-opening process,obeying the Woodward-Hoffmann's Rules upon heating.The mono-/di-substituted BCBs exhibited 8.2%—69%lowerΔGA compared with BCB,attributed to the electronic effects of the substituents.Disubstituted BCBs with both electron-donating and electron-withdrawing groups,e.g.,1-NH_(2)-8-NO_(2)-BCB,demonstrated the lowestΔGA.In addition,BCB derivatives with amide/ester/acyloxy group modified on C1 position were synthesized as model molecules,and their ring-opening temperature can be decreased by 20℃ compared to the unsubstituted one,also consistent with our calculation results.This work combined theoretical calculation methods with experimental results to provide valuable insights into the design and synthesis of BCB derivatives and next-generation BCB functional packaging materials with low ring-opening temperature.
基金National Natural Science Foundation of China,Grant/Award Number:21672051Natural Science Foundation of Hebei Province for Distinguished Young Scholar,Grant/Award Number:B2017201072+4 种基金Natural Science Foundation of Hebei Province,Grant/Award Number:B2020201044KeyResearch Projects of Science andTechnology Project of Hebei Education Department,Grant/Award Number:ZD2020128talent training project of Hebei Province,Grant/Award Number:A201902006City University of Hongkong,111 Project,Grant/Award Number:D20015State Key Laboratory of Supramolecular Structure and Materials,Jilin University,Grant/Award Number:sklssm2020041。
文摘Construction of crystalline homo/heteroaggregation at micro/nanometer level from organicπ-conjugated systems is of great importance because the controllable morphologies(i.e.,size,shape,and dimension)could provide diverse optoelectronic properties for different applications in the electrooptical devices.In this review,we summarize our recent progress in the self-assembly of micro/nanostructures of organicπ-conjugated molecules via the heteroaggregation and homoaggregation strategies.We also discuss various factors(i.e.,temperature,solvents,and surfactants)that affect the aggregation process through a surfactant-assisted reprecipitation method.Moreover,their physical properties and possible applications in electronics and biofields are illustrated.
基金financially supported by the National Natural Science Foundation of China(Nos. 21102031, 21442010 and 21672051)the Natural Science Foundation of Hebei Province for Distinguished Young Scholar(No. B2017201072)+1 种基金Cultivation Project (No. B2015201183)the Natural Science Foundation of Hebei University (No. 2015JQY02)
文摘A novel dimesityl-decorated bistetracene derivative 8,16-dimesityltetraceno[2,1,12,11-opqra]tetracene（DMTA） has been synthesized and characterized. Its single crystal analysis demonstrates that the parent bistetracene backbone is almost in a plane without any intermolecular 7 r-stacking interaction. DMTA exhibited the low-energy absorption at 560/607 nm and emission spectra at 617/663 nm, respectively.The fabricated device based on DMTA doping into 2,6-bis（3-（9 H-carbazol-9-yl）phenyl）pyridine（1 %） as an emitter present a maximum brightness of 632 cd/m^2 at 14.7 V with the CIE coordinate of（0.623,0.349）.
