White light emitting systems of pure organic materials have attracted extensive research interest due to their better compatibility and functional scalability.The reported organic white light materials are mainly base...White light emitting systems of pure organic materials have attracted extensive research interest due to their better compatibility and functional scalability.The reported organic white light materials are mainly based on the multi-channel emission regulation of the compound itself or the mixing of multicolor luminescence materials,but studies on the dependence between multicolor luminescence and the external environment are lacking,which limits the application of these materials in areas such as identification and sensing.This paper reports that the 4-or 3?hydroxyl-substituted naphthalimides NapH1 and NapH2 form intermolecular hydrogen bonds with adjacent molecules in the environment,and undergo excited-state intermolecular proton transfer under irradiation,resulting in blue-yellow or blue-red dual fluorescence emission,respectively.Since the two compounds have different two-color luminescence channels and the two-color intensity ratio is affected by the environment,and the intermolecular hydrogen bond is determined by the hydrogen bond receptor,polarity,and temperature in the environment,the full spectrum from blue to red light and white light emission can be obtained by adjusting the mixing ratio of the two dyes and the solvent polarity and the ambient temperature.This environmentally sensitive white emission is used to detect the alkalinity of different papers,and the dyed paper can be used as a test strip for acid-base vapor detection.展开更多
Protein self-labeling tags achieve selective fusion and labeling of target proteins through genetic coding technology,but require exogenous fluorescent probes with fluorogenicity for protein tag binding to have the pe...Protein self-labeling tags achieve selective fusion and labeling of target proteins through genetic coding technology,but require exogenous fluorescent probes with fluorogenicity for protein tag binding to have the performance of wash-free fluorescence imaging in live cells.In this paper,we reported a fluorogenic probe 1 capable of ratiometric fluorescence recognition of SNAP-tag proteins.In this probe,the O6-benzylguanine derivative of 3-hydroxy-1,8-naphthalimide underwent a selective covalent linkage reaction with SNAP-tag protein.The hydroxyl group on the naphthalimide fluorophore formed a hydrogen bond with the functional group near the protein cavity.The excited state proton transfer occurred after illumination,to obtain the ratio fluorescence signal from blue emission to red emission,realizing the wash-free fluorescence imaging of the target proteins.展开更多
基金the National Natural Science Foundation of China(Nos.22225806,22078314,22278394)Dalian Institute of Chemical Physics(Nos.DICPI202227,DICPI202142).
文摘White light emitting systems of pure organic materials have attracted extensive research interest due to their better compatibility and functional scalability.The reported organic white light materials are mainly based on the multi-channel emission regulation of the compound itself or the mixing of multicolor luminescence materials,but studies on the dependence between multicolor luminescence and the external environment are lacking,which limits the application of these materials in areas such as identification and sensing.This paper reports that the 4-or 3?hydroxyl-substituted naphthalimides NapH1 and NapH2 form intermolecular hydrogen bonds with adjacent molecules in the environment,and undergo excited-state intermolecular proton transfer under irradiation,resulting in blue-yellow or blue-red dual fluorescence emission,respectively.Since the two compounds have different two-color luminescence channels and the two-color intensity ratio is affected by the environment,and the intermolecular hydrogen bond is determined by the hydrogen bond receptor,polarity,and temperature in the environment,the full spectrum from blue to red light and white light emission can be obtained by adjusting the mixing ratio of the two dyes and the solvent polarity and the ambient temperature.This environmentally sensitive white emission is used to detect the alkalinity of different papers,and the dyed paper can be used as a test strip for acid-base vapor detection.
基金supported by the National Natural Science Foundation of China(Nos.22225806,22078314 and 22278394)Dalian Institute of Chemical Physics(Nos.DICPI202227 and DICPI202142)。
文摘Protein self-labeling tags achieve selective fusion and labeling of target proteins through genetic coding technology,but require exogenous fluorescent probes with fluorogenicity for protein tag binding to have the performance of wash-free fluorescence imaging in live cells.In this paper,we reported a fluorogenic probe 1 capable of ratiometric fluorescence recognition of SNAP-tag proteins.In this probe,the O6-benzylguanine derivative of 3-hydroxy-1,8-naphthalimide underwent a selective covalent linkage reaction with SNAP-tag protein.The hydroxyl group on the naphthalimide fluorophore formed a hydrogen bond with the functional group near the protein cavity.The excited state proton transfer occurred after illumination,to obtain the ratio fluorescence signal from blue emission to red emission,realizing the wash-free fluorescence imaging of the target proteins.
