Organic diradicaloids have unusual open-shell nature and properties and are promising materials for organic electronics,spintronics,energy storage and nonlinear optics.In this review,we focus on indeno-type organic di...Organic diradicaloids have unusual open-shell nature and properties and are promising materials for organic electronics,spintronics,energy storage and nonlinear optics.In this review,we focus on indeno-type organic diradicaloids and summarize their molecular design and synthesis,as well as topological structures,open-shell characters and diradical properties.The molecular systems are classified into indenofluorenes and diindenoacenes,indeno-based molecules with one-dimensional,two-dimensional and unique topological structures,and heterocyclic indeno-based molecules.By constructing these various topologicalπ-skeletons with tunable conjugation modes and variation of atomic composition,their key open-shell parameters,such as diradical characters and singlet-triplet energy gaps,along with the optical,electronic and magnetic properties,as well as stabilities are efficiently modulated.More attention may be paid to accurate computational analysis,rational design and synthesis,and novel functions of indeno-type diradicaloids,which will promote the development of radical chemistry and materials.展开更多
A series of cholesterol-appended quinacridone (QA) derivatives 1a-1d have been synthesized,in which 1b and 1c could form stable organogels in a wide range of organic solvents upon ultrasound irradiation.Field emission...A series of cholesterol-appended quinacridone (QA) derivatives 1a-1d have been synthesized,in which 1b and 1c could form stable organogels in a wide range of organic solvents upon ultrasound irradiation.Field emission scanning electronic microscope (FESEM) and transmission electron microscopy (TEM) of xerogels or precipitates indicated that 1b and 1c formed 1D fibrous nanostructure,while 1a assembled into 3D flower-like microstructures.The ultrasound-induced organogel process was characterized by kinetic UV-vis and photoluminescence spectroscopic methods suggesting the formation of ?-? aggregates in the gel state.Experimental results demonstrated that the ultrasound could promote molecules to contact frequently in the solution and induce semistable initial aggregates,which propagate to form nano/micro superstructures.The aggregation model was optimized by semiempirical AM1 calculation suggesting the hierarchical self-assembly process.In addition,the formed xerogel film exhibited mechanochromic property,and the phase transition process was accompanied by the fluorescence changes between yellowish green and orange.展开更多
基金National Natural Science Foundation of China(No.22175074)Jilin Scientific and Technological Development Program,China(No.20220101054JC).
文摘Organic diradicaloids have unusual open-shell nature and properties and are promising materials for organic electronics,spintronics,energy storage and nonlinear optics.In this review,we focus on indeno-type organic diradicaloids and summarize their molecular design and synthesis,as well as topological structures,open-shell characters and diradical properties.The molecular systems are classified into indenofluorenes and diindenoacenes,indeno-based molecules with one-dimensional,two-dimensional and unique topological structures,and heterocyclic indeno-based molecules.By constructing these various topologicalπ-skeletons with tunable conjugation modes and variation of atomic composition,their key open-shell parameters,such as diradical characters and singlet-triplet energy gaps,along with the optical,electronic and magnetic properties,as well as stabilities are efficiently modulated.More attention may be paid to accurate computational analysis,rational design and synthesis,and novel functions of indeno-type diradicaloids,which will promote the development of radical chemistry and materials.
基金supported by the National Natural Science Foundation of China (50773027 and 50733002)the National Basic Research Development Program (2009CB939700)111 Project (B06009)
文摘A series of cholesterol-appended quinacridone (QA) derivatives 1a-1d have been synthesized,in which 1b and 1c could form stable organogels in a wide range of organic solvents upon ultrasound irradiation.Field emission scanning electronic microscope (FESEM) and transmission electron microscopy (TEM) of xerogels or precipitates indicated that 1b and 1c formed 1D fibrous nanostructure,while 1a assembled into 3D flower-like microstructures.The ultrasound-induced organogel process was characterized by kinetic UV-vis and photoluminescence spectroscopic methods suggesting the formation of ?-? aggregates in the gel state.Experimental results demonstrated that the ultrasound could promote molecules to contact frequently in the solution and induce semistable initial aggregates,which propagate to form nano/micro superstructures.The aggregation model was optimized by semiempirical AM1 calculation suggesting the hierarchical self-assembly process.In addition,the formed xerogel film exhibited mechanochromic property,and the phase transition process was accompanied by the fluorescence changes between yellowish green and orange.
