A metal-free,visible-light-induced strategy has been developed for the diborylation of gem-dibromoalkanes.This reaction enables the construction of structurally diverse alkyl gem-diboronates at room temperature via vi...A metal-free,visible-light-induced strategy has been developed for the diborylation of gem-dibromoalkanes.This reaction enables the construction of structurally diverse alkyl gem-diboronates at room temperature via visible-light-induced C—Br bond activation using B2cat2 as the boron source.Through a tandem in-situ dibromination/diborylation process,a onepot transformation from aldehydes to alkyl gem-diboronates has been achieved.Additionally,sunlight irradiation has been demonstrated as a viable alternative for inducing this reaction,enabling gram-scale synthesis with practical applicability.展开更多
Fluorescence anisotropy was employed for the investigation of the association between AlS 4Pc and BSA. The average binding number of AlS 4Pc to BSA was calculated and the constants of association reaction occurring in...Fluorescence anisotropy was employed for the investigation of the association between AlS 4Pc and BSA. The average binding number of AlS 4Pc to BSA was calculated and the constants of association reaction occurring in the medium of pH 7 0 were shown. The results revealed that the interaction between AlS 4Pc and BSA was strong, which implied that AlS 4Pc may be stored and transferred by serum albumin. The merits of the method used were also pointed out.展开更多
In thes pape, the solld state. polymer thin films of 8-hydroxylquinoline aluminum (Alq3) were mad by spdring coat method. The fluorescence efficiencies and the luminscence spectra of them were measured via the laser s...In thes pape, the solld state. polymer thin films of 8-hydroxylquinoline aluminum (Alq3) were mad by spdring coat method. The fluorescence efficiencies and the luminscence spectra of them were measured via the laser systeIns. Various experimental factors were considered and tested. It was found tha the peak wavelength of the lundnescence spectra of the Alq3 polymer films shifted and that the purity of the samples affected its fiuorescence efficiencies: the fluorescence deencies of impure sampls were about three-fourth of that of the purified ones; fluorescence efficiencies of Alq3 doped in PMMA polymer was higher than tha doped in PC and PEO.Under certain condihons, transparent thin film 10 layers can be achieved. This kind of polymer thin film of Alq3 exhibits well fluorescence response, bu also has good stability . Spin coat method can greatly reduce the technical requirements comparing with the vacuum plating method.展开更多
Solubilities (S) of KBPh4 in water, methanol, ethanol, 1-propanol, 1-butanol,1-pentanol, 1-hexanol, 1-octanol at 288.15, 298.15, 308.15, 318.15, 328.15K have been determined by the spectrophotometry. These data can be...Solubilities (S) of KBPh4 in water, methanol, ethanol, 1-propanol, 1-butanol,1-pentanol, 1-hexanol, 1-octanol at 288.15, 298.15, 308.15, 318.15, 328.15K have been determined by the spectrophotometry. These data can be expressed by 1gS=-(1.4184-0.8725lgn)/(1-132.45T-1), where n are the atomic number of carbon for the straight chains monohydric alcohols; T is the temperatuxe. The standard transfer free energies (△tG) of KBPh4 from water to straight chains monohydric alcohols in the temperature ranges of 288.15-328.15K have been calculated. The results can be expressed as △tG=-18.029+5.766×10-5T2+(6.817×10-2-5.302×10-10T3)-1lgn.展开更多
文摘A metal-free,visible-light-induced strategy has been developed for the diborylation of gem-dibromoalkanes.This reaction enables the construction of structurally diverse alkyl gem-diboronates at room temperature via visible-light-induced C—Br bond activation using B2cat2 as the boron source.Through a tandem in-situ dibromination/diborylation process,a onepot transformation from aldehydes to alkyl gem-diboronates has been achieved.Additionally,sunlight irradiation has been demonstrated as a viable alternative for inducing this reaction,enabling gram-scale synthesis with practical applicability.
文摘Fluorescence anisotropy was employed for the investigation of the association between AlS 4Pc and BSA. The average binding number of AlS 4Pc to BSA was calculated and the constants of association reaction occurring in the medium of pH 7 0 were shown. The results revealed that the interaction between AlS 4Pc and BSA was strong, which implied that AlS 4Pc may be stored and transferred by serum albumin. The merits of the method used were also pointed out.
文摘In thes pape, the solld state. polymer thin films of 8-hydroxylquinoline aluminum (Alq3) were mad by spdring coat method. The fluorescence efficiencies and the luminscence spectra of them were measured via the laser systeIns. Various experimental factors were considered and tested. It was found tha the peak wavelength of the lundnescence spectra of the Alq3 polymer films shifted and that the purity of the samples affected its fiuorescence efficiencies: the fluorescence deencies of impure sampls were about three-fourth of that of the purified ones; fluorescence efficiencies of Alq3 doped in PMMA polymer was higher than tha doped in PC and PEO.Under certain condihons, transparent thin film 10 layers can be achieved. This kind of polymer thin film of Alq3 exhibits well fluorescence response, bu also has good stability . Spin coat method can greatly reduce the technical requirements comparing with the vacuum plating method.
文摘Solubilities (S) of KBPh4 in water, methanol, ethanol, 1-propanol, 1-butanol,1-pentanol, 1-hexanol, 1-octanol at 288.15, 298.15, 308.15, 318.15, 328.15K have been determined by the spectrophotometry. These data can be expressed by 1gS=-(1.4184-0.8725lgn)/(1-132.45T-1), where n are the atomic number of carbon for the straight chains monohydric alcohols; T is the temperatuxe. The standard transfer free energies (△tG) of KBPh4 from water to straight chains monohydric alcohols in the temperature ranges of 288.15-328.15K have been calculated. The results can be expressed as △tG=-18.029+5.766×10-5T2+(6.817×10-2-5.302×10-10T3)-1lgn.
