CONSPECTUS:Luminescent nano/micro molecular crystals with well-defined shapes and morphologies have exhibited great potential for various photonic applications.The molecular orientation and packing greatly influence t...CONSPECTUS:Luminescent nano/micro molecular crystals with well-defined shapes and morphologies have exhibited great potential for various photonic applications.The molecular orientation and packing greatly influence the optical and electronic characters of the crystals.Noncovalent intermolecular interactions can not only determine the growth direction but also induce the formation of polymorphs,bringing more possibilities for the property optimization and functional applications.Besides,light-harvesting energy transfer(LHEnT)is a vital process in natural photosynthesis,the mimic of which provides a simple and practical means for solar energy conversion and the preparation of luminescent materials.With an energy donor and acceptor pair with suitable energy levels and similar molecular size and solubility,it is convenient to fabricate LHEnT molecular crystals with tunable optoelectronic and emission properties by dispersing acceptors into the donor lattices.展开更多
The N--N linkage in hydrazine is thermally stable when it is tetrasubstituted and there are electron-withdrawinggroups attached to the nitrogen atoms. Our research on the synthesis of polymers contaning N--N linkages ...The N--N linkage in hydrazine is thermally stable when it is tetrasubstituted and there are electron-withdrawinggroups attached to the nitrogen atoms. Our research on the synthesis of polymers contaning N--N linkages is reviewed. TheN,N-bisimide structure has been introduced in the backbone of polymers as well as a pendant group in poly(aryl ether)s togive very thermoxidatively stable polymers with very high glass transition temperatures. Most of the polymers form tough,flexible films. N-Aminotriazoles also form stable imides by reaction with anhydrides and these N-imidotriazole groups havebeen introduced as pendent groups on poly(aryl ether)s. The polymers are highly fluorescent materials. Three methods for thesynthesis of polymers containing the tetrasubstituted-azine structure will be discussed: (1) oxidative coupling of bisimines;(2) condensation of bishydrazones with diketones; (3) poly(aryl ether azines) from the azine formed from 4-fluorobenzo-phenone by reaction with salts of bisphenols.展开更多
基金the National R&D Program of China(2023YFE0125200)National Natural Science Foundation of China(grants 22305251,22090021,and 21925112)for funding support。
文摘CONSPECTUS:Luminescent nano/micro molecular crystals with well-defined shapes and morphologies have exhibited great potential for various photonic applications.The molecular orientation and packing greatly influence the optical and electronic characters of the crystals.Noncovalent intermolecular interactions can not only determine the growth direction but also induce the formation of polymorphs,bringing more possibilities for the property optimization and functional applications.Besides,light-harvesting energy transfer(LHEnT)is a vital process in natural photosynthesis,the mimic of which provides a simple and practical means for solar energy conversion and the preparation of luminescent materials.With an energy donor and acceptor pair with suitable energy levels and similar molecular size and solubility,it is convenient to fabricate LHEnT molecular crystals with tunable optoelectronic and emission properties by dispersing acceptors into the donor lattices.
文摘The N--N linkage in hydrazine is thermally stable when it is tetrasubstituted and there are electron-withdrawinggroups attached to the nitrogen atoms. Our research on the synthesis of polymers contaning N--N linkages is reviewed. TheN,N-bisimide structure has been introduced in the backbone of polymers as well as a pendant group in poly(aryl ether)s togive very thermoxidatively stable polymers with very high glass transition temperatures. Most of the polymers form tough,flexible films. N-Aminotriazoles also form stable imides by reaction with anhydrides and these N-imidotriazole groups havebeen introduced as pendent groups on poly(aryl ether)s. The polymers are highly fluorescent materials. Three methods for thesynthesis of polymers containing the tetrasubstituted-azine structure will be discussed: (1) oxidative coupling of bisimines;(2) condensation of bishydrazones with diketones; (3) poly(aryl ether azines) from the azine formed from 4-fluorobenzo-phenone by reaction with salts of bisphenols.
