Hypocrellin A and B in methanol were autosensitized and photooxygenated to 1,4,6, 7 and 2,5,8,9 respectively.1 in methanol was photooxygenated to 6 and 7 under the sensitization by HB.1 in methanol was photooxygenated...Hypocrellin A and B in methanol were autosensitized and photooxygenated to 1,4,6, 7 and 2,5,8,9 respectively.1 in methanol was photooxygenated to 6 and 7 under the sensitization by HB.1 in methanol was photooxygenated to 7 under the sensitization by Rose bengal.1 in benzene ir- radiated with medium-pressure-mercury lamp was photolyzed to 3 in the presence of iodine.展开更多
Beijing suffered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutant...Beijing suffered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutants, physical and chemical properties of single particles, and the profile of water-soluble ions in PM2.5 during the three episodes. Regional and photochemically aged air masses, which were characterized as having high values of O3 and SO2, were hypothesized to have played a dominant role in the first episode. After mixing local air masses with freshly-emitted primary pollutants, the concentration of NOx continued to increase and the size of SO42-, NO3- and NH4＋ in the particle population continued to become smaller. The amount of elemental carbon-rich and organic carbonrich particles in the scaled single particles （0.2-2 μm） and water-soluble K＋ in PM2.s also increased in the episodes. All the available information suggests that the biomass or fuel burning sources in or around Beijing may have had a huge impact on the last two episodes.展开更多
A new aminated-perylenequinone derivative 2 was synthesized by the reaction of 1 (hypocrellin B) with 6-aminohexanoic-acid. The structure of 2 was identified by UV-Vis, MS, IR and H-1-NMR. Thc amphiphility spectrum an...A new aminated-perylenequinone derivative 2 was synthesized by the reaction of 1 (hypocrellin B) with 6-aminohexanoic-acid. The structure of 2 was identified by UV-Vis, MS, IR and H-1-NMR. Thc amphiphility spectrum and photochemical properties of 2 were reported.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘Hypocrellin A and B in methanol were autosensitized and photooxygenated to 1,4,6, 7 and 2,5,8,9 respectively.1 in methanol was photooxygenated to 6 and 7 under the sensitization by HB.1 in methanol was photooxygenated to 7 under the sensitization by Rose bengal.1 in benzene ir- radiated with medium-pressure-mercury lamp was photolyzed to 3 in the presence of iodine.
基金supported by the National Natural Scientific Foundation of China(No.41005065,41375132)the National Department Public Benefit Research Foundation(No.201409003,201009001,201309011)Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB05030400)
文摘Beijing suffered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutants, physical and chemical properties of single particles, and the profile of water-soluble ions in PM2.5 during the three episodes. Regional and photochemically aged air masses, which were characterized as having high values of O3 and SO2, were hypothesized to have played a dominant role in the first episode. After mixing local air masses with freshly-emitted primary pollutants, the concentration of NOx continued to increase and the size of SO42-, NO3- and NH4＋ in the particle population continued to become smaller. The amount of elemental carbon-rich and organic carbonrich particles in the scaled single particles （0.2-2 μm） and water-soluble K＋ in PM2.s also increased in the episodes. All the available information suggests that the biomass or fuel burning sources in or around Beijing may have had a huge impact on the last two episodes.
基金the National Natural Science Foundation of China (Project No.39830090 and No.39970871) for their financial support to this resea
文摘A new aminated-perylenequinone derivative 2 was synthesized by the reaction of 1 (hypocrellin B) with 6-aminohexanoic-acid. The structure of 2 was identified by UV-Vis, MS, IR and H-1-NMR. Thc amphiphility spectrum and photochemical properties of 2 were reported.
