Bis (7- diethylaminocoumarin) ketone- 3(DACK) and diphenyliodonium salt (DPIO)combination as an effective photoinitiation system for radical polymerization has been investigated. The sensitized photolysis of DACK/DPIO...Bis (7- diethylaminocoumarin) ketone- 3(DACK) and diphenyliodonium salt (DPIO)combination as an effective photoinitiation system for radical polymerization has been investigated. The sensitized photolysis of DACK/DPIO leads to bleaching of DACK and decomposition of DPIO to generate initiating radical species. The electron transfer sensitization occurs mainly from the triplet state of DACK. The photobleaching obeyed a second-order kinetics and the rate constant was evaluated to be 31.3mol^(-1)·1·s^(-1) Photopolymerization of MMA initiated by DACK/DPIO was carried out in acetonitrile solution. The polymerization rate was found to be proportional to the concentration of DACK, DPIO and MMA with the exponents of 0.34, 0.40 and 1.0 respectively. The initiated efficiency is comparable to those of small molecular ketones.The sensitized photoinitiation mechanism has been discussed.展开更多
Eight new brominated 2＇（4＇）-nitro-3-hydroxy diphenyl ethers have been designed and synthesized. The structures of new compounds were confirmed by ^1H NMR, IR and HRMS. The bioactivity tests showed that these compo...Eight new brominated 2＇（4＇）-nitro-3-hydroxy diphenyl ethers have been designed and synthesized. The structures of new compounds were confirmed by ^1H NMR, IR and HRMS. The bioactivity tests showed that these compounds possessed antibacterial activities against the tested bacteria. These new compounds cannot be transformed into dioxins when they were manufactured and used.展开更多
A novel compound of 1,2-dis（1,3-diphenylpropan-2-yl）disulfane（C30H30S2,Mr=454.27）was synthesized in ethanol with 1,3-diphenyl-2-propanone as raw materials,giving high yield of product（90%）.Its structure was dete...A novel compound of 1,2-dis（1,3-diphenylpropan-2-yl）disulfane（C30H30S2,Mr=454.27）was synthesized in ethanol with 1,3-diphenyl-2-propanone as raw materials,giving high yield of product（90%）.Its structure was determined by IR,1H NMR,MS,elemental analysis and X-ray diffraction.The crystal belongs to monoclinic,space group C2 with a=18.727（3）,b=6.5179（9）,c=13.7576（18）,β=131.0610（10）o,V=1266.2（3）3,Z=2,Dc=2.136 g/cm3,μ=1.078 mm-1,F（000）=843,R=0.0490 and wR=0.1247 for 3211 observed reflections with I2（I）.X-ray analysis reveals that the molecule is not symmetrical.There exist no classical hydrogen bonds andπ-πstacking interactions.Moreover,the thermal stability of compound 3 was investigated.展开更多
3-(1-Naphthyl)-2,5-diphenyl-2H-tetrazolium chloride was prepared from benzaldehyde-phenylhydrazone by coupling with 1-naphthylamine diazonium salt followed by oxidation with chlorine in 72%overall yield.
文摘Bis (7- diethylaminocoumarin) ketone- 3(DACK) and diphenyliodonium salt (DPIO)combination as an effective photoinitiation system for radical polymerization has been investigated. The sensitized photolysis of DACK/DPIO leads to bleaching of DACK and decomposition of DPIO to generate initiating radical species. The electron transfer sensitization occurs mainly from the triplet state of DACK. The photobleaching obeyed a second-order kinetics and the rate constant was evaluated to be 31.3mol^(-1)·1·s^(-1) Photopolymerization of MMA initiated by DACK/DPIO was carried out in acetonitrile solution. The polymerization rate was found to be proportional to the concentration of DACK, DPIO and MMA with the exponents of 0.34, 0.40 and 1.0 respectively. The initiated efficiency is comparable to those of small molecular ketones.The sensitized photoinitiation mechanism has been discussed.
文摘Eight new brominated 2＇（4＇）-nitro-3-hydroxy diphenyl ethers have been designed and synthesized. The structures of new compounds were confirmed by ^1H NMR, IR and HRMS. The bioactivity tests showed that these compounds possessed antibacterial activities against the tested bacteria. These new compounds cannot be transformed into dioxins when they were manufactured and used.
基金Supported by the Natural Science Foundation of Hubei Province(No.2012FFB01103)the Hubei Provincial Department of Education(No.Q20131905)+2 种基金the National Natural Science Foundation of China(No.21262011)the Fund of Ethnic Affairs Commission of China(No.12HBZ010)the Team Research for Excellent Mid-aged and Young Teachers of Higher Education of Hubei Province(T201006)
文摘A novel compound of 1,2-dis（1,3-diphenylpropan-2-yl）disulfane（C30H30S2,Mr=454.27）was synthesized in ethanol with 1,3-diphenyl-2-propanone as raw materials,giving high yield of product（90%）.Its structure was determined by IR,1H NMR,MS,elemental analysis and X-ray diffraction.The crystal belongs to monoclinic,space group C2 with a=18.727（3）,b=6.5179（9）,c=13.7576（18）,β=131.0610（10）o,V=1266.2（3）3,Z=2,Dc=2.136 g/cm3,μ=1.078 mm-1,F（000）=843,R=0.0490 and wR=0.1247 for 3211 observed reflections with I2（I）.X-ray analysis reveals that the molecule is not symmetrical.There exist no classical hydrogen bonds andπ-πstacking interactions.Moreover,the thermal stability of compound 3 was investigated.
文摘3-(1-Naphthyl)-2,5-diphenyl-2H-tetrazolium chloride was prepared from benzaldehyde-phenylhydrazone by coupling with 1-naphthylamine diazonium salt followed by oxidation with chlorine in 72%overall yield.
