Three isomorphic ionic bismuth(Ⅲ)halides were synthesized,utilizing 2,2’-bipyridyl-1,1’-dioxide(bp2do)as the organic ligand decorated on the halobismuthate(Ⅲ)moieties,namely,[Ammim][BiBr_(4)(bp2do)](1,Ammim=1-ally...Three isomorphic ionic bismuth(Ⅲ)halides were synthesized,utilizing 2,2’-bipyridyl-1,1’-dioxide(bp2do)as the organic ligand decorated on the halobismuthate(Ⅲ)moieties,namely,[Ammim][BiBr_(4)(bp2do)](1,Ammim=1-allyl-2,3-dimethylimidazolium),[Ammim][BiCl_(4)(bp2do)](2)and[Amim][BiCl_(4)(bp2do)](3,Amim=1-allyl-3-methylimidazolium).They all crystallize in the space group of Pca2_(1)with a similar supramolecular packing mode.However,the average adjacent Bi–Bi distances are slightly different,that is 1>2>3.Moreover,they possess different phosphorescence quantum yields(QYs)with 0.38%for 1,27.83%for 2 and 34.76%for 3.Note that the QY of 3 remains the highest for bp2do-based halobismuthate hybrids.Their phosphorescence originates from the organic ligand bp2do,in which an inorganic-to-organic charge transfer(IOCT)process exists,as confirmed by density functional theory(DFT)calculations.The three compounds possess X-ray scintillation properties.Eventually,a WLED could be fabricated by mixing commercial nitride red phosphor with cyan-emitting 3.This study provides a method for the synthesis of organic ligand based ionic bismuth halide hybrids with higher QYs,and enriches X-ray scintillation materials.展开更多
Fourier transform infrared spectroscopy(FTIR) and constant heating rate experiments were performed to study the low temperature oxidation of coal treated by an ionic liquid,1-allyl-3-methylimidazolium chloride.The ine...Fourier transform infrared spectroscopy(FTIR) and constant heating rate experiments were performed to study the low temperature oxidation of coal treated by an ionic liquid,1-allyl-3-methylimidazolium chloride.The inerting effect of the ionic liquid toward the low temperature oxidation process is discussed.The results show that:(1) The hydroxyl content associated with hydrogen bonds,the aliphatic methyl content,the methylene group content,and the ether oxygen bond content are reduced in the treated coal.At the same time the content of aromatic C@C bonds is constant but these chemical bonds weaken and some substituted aromatic hydrocarbon content increases while other types decrease.This demonstrates that(AMIm)Cl dissolves and destroys the coal surface microstructure;(2) The oxygen consumption of the treated coal is less than what is seen in raw coal.The CO,CO 2,C 2 H 4,and C 2 H 6 content from the treated coal is reduced compared to the untreated coal;(3) The apparent activation energy for the oxidizing reaction is different in the treated and raw coals.Micro-structural changes and macroscopic gas production allow us to conclude that(AMIm)Cl can effectively inhibit low temperature oxidation of coal.展开更多
基金supported by the National Natural Science Foundation of China(No.21601181)the Natural Science Foundation of Fujian Province(No.2020J01118).
文摘Three isomorphic ionic bismuth(Ⅲ)halides were synthesized,utilizing 2,2’-bipyridyl-1,1’-dioxide(bp2do)as the organic ligand decorated on the halobismuthate(Ⅲ)moieties,namely,[Ammim][BiBr_(4)(bp2do)](1,Ammim=1-allyl-2,3-dimethylimidazolium),[Ammim][BiCl_(4)(bp2do)](2)and[Amim][BiCl_(4)(bp2do)](3,Amim=1-allyl-3-methylimidazolium).They all crystallize in the space group of Pca2_(1)with a similar supramolecular packing mode.However,the average adjacent Bi–Bi distances are slightly different,that is 1>2>3.Moreover,they possess different phosphorescence quantum yields(QYs)with 0.38%for 1,27.83%for 2 and 34.76%for 3.Note that the QY of 3 remains the highest for bp2do-based halobismuthate hybrids.Their phosphorescence originates from the organic ligand bp2do,in which an inorganic-to-organic charge transfer(IOCT)process exists,as confirmed by density functional theory(DFT)calculations.The three compounds possess X-ray scintillation properties.Eventually,a WLED could be fabricated by mixing commercial nitride red phosphor with cyan-emitting 3.This study provides a method for the synthesis of organic ligand based ionic bismuth halide hybrids with higher QYs,and enriches X-ray scintillation materials.
基金support from the National Natural Science Foundation of China (No.51074159)The Graduate Scientific Research Innovation Programme of Jiangsu Province Ordinary University (No. CXZZ12_0957)
文摘Fourier transform infrared spectroscopy(FTIR) and constant heating rate experiments were performed to study the low temperature oxidation of coal treated by an ionic liquid,1-allyl-3-methylimidazolium chloride.The inerting effect of the ionic liquid toward the low temperature oxidation process is discussed.The results show that:(1) The hydroxyl content associated with hydrogen bonds,the aliphatic methyl content,the methylene group content,and the ether oxygen bond content are reduced in the treated coal.At the same time the content of aromatic C@C bonds is constant but these chemical bonds weaken and some substituted aromatic hydrocarbon content increases while other types decrease.This demonstrates that(AMIm)Cl dissolves and destroys the coal surface microstructure;(2) The oxygen consumption of the treated coal is less than what is seen in raw coal.The CO,CO 2,C 2 H 4,and C 2 H 6 content from the treated coal is reduced compared to the untreated coal;(3) The apparent activation energy for the oxidizing reaction is different in the treated and raw coals.Micro-structural changes and macroscopic gas production allow us to conclude that(AMIm)Cl can effectively inhibit low temperature oxidation of coal.
