采用单溶剂萃取过滤的方法除去改质煤沥青中的喹啉不溶物(QI)得到净化煤沥青,通过分子量分析、元素分析、红外光谱分析、紫外分析、1H-NMR(Nuclear Magnetic Resonance)等方法对其进行结构表征。结果表明:该净化沥青的平均相对分子质量...采用单溶剂萃取过滤的方法除去改质煤沥青中的喹啉不溶物(QI)得到净化煤沥青,通过分子量分析、元素分析、红外光谱分析、紫外分析、1H-NMR(Nuclear Magnetic Resonance)等方法对其进行结构表征。结果表明:该净化沥青的平均相对分子质量为411,平均分子式为C31.41H19.19N0.29S0.08O0.52,平均每个分子的杂原子的总和数(N+O+S)<1.0个。红外分析结果表明样品中含有苯环结构,杂原子氧以羟基、R—O—R形式存在;氮以胺基(NH—)或叔氮的形式存在。紫外分析表明样品中含有三环及三环以上化合物,采用改进的Brown-Lander模型计算得知,该样品平均结构为八环稠环结构,面性排列(即迫位缩合)为主;线性排列(即渺位缩合)为辅。展开更多
Benzosiloles fused to heterocycles such as thiophene, benzothiophene, and benzofuran, and indole- and benzosilole-fused dibenzosiloles were prepared by palladium-catalyzed intramolecular coupling of the corresponding...Benzosiloles fused to heterocycles such as thiophene, benzothiophene, and benzofuran, and indole- and benzosilole-fused dibenzosiloles were prepared by palladium-catalyzed intramolecular coupling of the corresponding 2-（arylsilyl）aryl triflates in good to high yields. Molecular and crystal structures of 5,7-dihydro-5,5,7,7-tetrakis（1-methylethyl）bis[1]benzosilolo-[2,3-b：3＇, 2＇-d]thiophene, 6-methyl-12,12-diisopropyl-12H-indololo[3,2-b][1]silafluorene, and 5,5,11,11-tetraisopropyl-5,11H-benzosilolo[3,2-c]silafluorene were determined by X-ray diffraction analysis. The UV absorption spectra of the （di）benzosilole derivafives in cyclohexane red-shifted when compared to 1,1-diisopropyldibenzosilole, indicating that replacing a benzene ring of dibenzosilole by the heterocycles as well as fusion of indole and benzosilole moieties onto dibenzosilole narrowed the HOMO- LUMO gaps of the n-conjugation system. The thiophene-fused benzosiloles were faintly fluorescent in solution and in the solid state, whereas the dibenzosiloles exhibited luminescence with moderate and high quantum yields in cyclohexane and in microcrystals, respectively. In other words, aggregation-induced emission was observed for the dibenzosiloles. Notably, 5,5,11,1 1- tetraisopropyl-5,11H-benzosilolo[3,2-c]silafluorene in microcrystals exhibited violet fluorescence （λmax = 396 nm） with a quantum yield of 0.70. Density functional theory （DFT） calculations of the prepared （di）benzosiloles were also performed.展开更多
文摘采用单溶剂萃取过滤的方法除去改质煤沥青中的喹啉不溶物(QI)得到净化煤沥青,通过分子量分析、元素分析、红外光谱分析、紫外分析、1H-NMR(Nuclear Magnetic Resonance)等方法对其进行结构表征。结果表明:该净化沥青的平均相对分子质量为411,平均分子式为C31.41H19.19N0.29S0.08O0.52,平均每个分子的杂原子的总和数(N+O+S)<1.0个。红外分析结果表明样品中含有苯环结构,杂原子氧以羟基、R—O—R形式存在;氮以胺基(NH—)或叔氮的形式存在。紫外分析表明样品中含有三环及三环以上化合物,采用改进的Brown-Lander模型计算得知,该样品平均结构为八环稠环结构,面性排列(即迫位缩合)为主;线性排列(即渺位缩合)为辅。
基金supported by Grants-in-Aid for Creative Research (16GS0209)Scientific Research (22350081)from the Ministry of Education,Culture,Sports,Science and Technology,Japan
文摘Benzosiloles fused to heterocycles such as thiophene, benzothiophene, and benzofuran, and indole- and benzosilole-fused dibenzosiloles were prepared by palladium-catalyzed intramolecular coupling of the corresponding 2-（arylsilyl）aryl triflates in good to high yields. Molecular and crystal structures of 5,7-dihydro-5,5,7,7-tetrakis（1-methylethyl）bis[1]benzosilolo-[2,3-b：3＇, 2＇-d]thiophene, 6-methyl-12,12-diisopropyl-12H-indololo[3,2-b][1]silafluorene, and 5,5,11,11-tetraisopropyl-5,11H-benzosilolo[3,2-c]silafluorene were determined by X-ray diffraction analysis. The UV absorption spectra of the （di）benzosilole derivafives in cyclohexane red-shifted when compared to 1,1-diisopropyldibenzosilole, indicating that replacing a benzene ring of dibenzosilole by the heterocycles as well as fusion of indole and benzosilole moieties onto dibenzosilole narrowed the HOMO- LUMO gaps of the n-conjugation system. The thiophene-fused benzosiloles were faintly fluorescent in solution and in the solid state, whereas the dibenzosiloles exhibited luminescence with moderate and high quantum yields in cyclohexane and in microcrystals, respectively. In other words, aggregation-induced emission was observed for the dibenzosiloles. Notably, 5,5,11,1 1- tetraisopropyl-5,11H-benzosilolo[3,2-c]silafluorene in microcrystals exhibited violet fluorescence （λmax = 396 nm） with a quantum yield of 0.70. Density functional theory （DFT） calculations of the prepared （di）benzosiloles were also performed.
