In order to minimize the pollution of ferrous sulfate, a by-product of titanium dioxide, and increase the yield of synthetic ester, the SO 2- <sub>4/Fe2O3 nanosolid superacid has been produced by chemical precip...In order to minimize the pollution of ferrous sulfate, a by-product of titanium dioxide, and increase the yield of synthetic ester, the SO 2- <sub>4/Fe2O3 nanosolid superacid has been produced by chemical precipitation and its micrographs was determined by SEM. The effect of preparation conditions of SO 2- <sub>4/Fe2O3 nanosolid superacid on catalysis synthesis butyl acetate and synthesis conditions of butyl acetate were studied.From experimental data,as compared with liquid acid, SO 2- <sub>4/Fe2O 3 nanosolid superacid showed higher catalytic performance in catalytic synthesis of butyl acetate,and the yield of butyl acetate was obviously increased in the same reaction time.展开更多
A new family of photochromic diarylethene compounds, 1-（2-methyl-5-formyl-3- thienyl）-2-（2-methoxylphenyl）perfluorocyclopentene （1o） having an unsymmetrically substituted hexafluorocyclopentene unit, was synthes...A new family of photochromic diarylethene compounds, 1-（2-methyl-5-formyl-3- thienyl）-2-（2-methoxylphenyl）perfluorocyclopentene （1o） having an unsymmetrically substituted hexafluorocyclopentene unit, was synthesized and its structure was determined. The crystal belongs to the monoclinic system, space group P21/c with a = 15.4866（5）, b = 9.0744（9）, c = 12.6906（3）, β = 90.1480（10）°, Z = 4, V = 1783.4（3）3, Dc = 1.513 mg/m3, μ = 0.25, F（000） = 824, the final R = 0.0579 and wR = 0.1566 for 2584 observed reflections （I 2σ（I））. Interestingly, a colorless compound 1o undergoes photocyclization upon irradiation of UV light to give the blue isomer diarylethene. Upon irradiation with visible light with wavelength greater than 510 nm, the blue compound can return to its initial colorless state.展开更多
The ionothermal reaction of Zn（NO3）2·6H2O with 5-sulfoisophthalic acid monosodium salt（NaH2SIP） and 1,2,4-triazole in 1-ethyl-3-methylimidazolium tetrafluoroborate（EMIM-BF4） ionic liquid has afforded the co...The ionothermal reaction of Zn（NO3）2·6H2O with 5-sulfoisophthalic acid monosodium salt（NaH2SIP） and 1,2,4-triazole in 1-ethyl-3-methylimidazolium tetrafluoroborate（EMIM-BF4） ionic liquid has afforded the compound {（EMIM）[Zn（SIP）]}n（1）.The Zn（Ⅱ） ions are linked by the carboxylate groups of SIP^3- ligands to give a two-dimensional layered structure featuring the centrosymmetric dinuclear Zn2（μ2-COO）2 units.The adjacent two-dimensional layers are further linked by the Zn-0 bonds between the Zn（Ⅱ） ions and the sulfonate O atoms to generate a three-dimensional anionic[Zn（SIP）]n^n- framework featuring one-dimensional open channels propagating along the a axis.The imidazolium cations[EMIM]^＋ derived from ionic liquid act as extraframework charge-balancing species for the anionic[Zn（SIP）]n^n- framework and occupy the void space of the one-dimensional open channels.The rich ionic environments of the ionic liquid may be particularly helpful in the formation of the ionic compound 1.The roles of the ionic liquid in ionothermal synthesis and crystallization of the compound are briefly discussed.Furthermore,compound 1 displays a photoluminescent emission at 490 nm upon excitation at 406 nm.展开更多
A new photochromic diarylethene, [1-（2-methyl-5-（4-chlorophenyl）-3-thienyl-2-（2- methoxylphenyl）]perfluorocyclopentene （1o, C23HIsC1F6OS） was synthesized and its structure was determined by single-crystal X-ray...A new photochromic diarylethene, [1-（2-methyl-5-（4-chlorophenyl）-3-thienyl-2-（2- methoxylphenyl）]perfluorocyclopentene （1o, C23HIsC1F6OS） was synthesized and its structure was determined by single-crystal X-ray diffraction analysis. The crystal belongs to the triclinic system, space group Pi with a = 9.421（1）, b = 10.4664（1）, c = 11.2988（2）, α= 88.014（1）, β= 76.976（1）,γ= 82.319（1）°, Z= 2, V= 1075.7（2） A3, Dc = 1.509 mg/m3, μ= 0.339 mm-1, F（000） = 496, the final R = 0.0353 and wR = 0.0922 for 3303 observed reflections （I 〉 2σ（I））. Further study demonstrated this compound underwent reversible photochromism with high contrast color-switching between colorless and blue in hexane. Upon UV/Vis irradiation, the fluorescence quenching efficiency can be attached to ca. 98% and recover to the initial state which exhibits high contrast fluorescentswitching between ＂on＂ and ＂off＂ states.展开更多
The crystal structure of fused photochromic diarylethene dimer, 1,4-bis-[4-(4-{2-(5-phenyl)-2-methyl-thiophen-3-yl]-3,3,4,4,5,5-hexafluoro-cyclopent-1-enyl}-5-methyl-thiophen-2-yl) buta-1,3-diyne(1 oo, C46 H23 F12 S4)...The crystal structure of fused photochromic diarylethene dimer, 1,4-bis-[4-(4-{2-(5-phenyl)-2-methyl-thiophen-3-yl]-3,3,4,4,5,5-hexafluoro-cyclopent-1-enyl}-5-methyl-thiophen-2-yl) buta-1,3-diyne(1 oo, C46 H23 F12 S4) was determined by single-crystal X-ray diffraction analysis. This crystal belongs to the triclinic system, space group P1 with a = 7.546(3), b = 8.869(3), c = 16.196(5), α = 98.000(4)°, β = 100.803(4)°, γ = 98.449(4)°, Z = 2, V = 1037.6(6) ?~3, Dc = 1.496 mg/m^3, μ = 0.317, F(000) = 474, the final R = 0.0428 and wR = 0.1199 for 4115 observed reflections(I > 2σ(I)). Further study demonstrated this compound underwent reversible photochromism with color-switching between colorlessness and green in crystalline state. Upon 365 nm irradiation, the diarylethene shows one step photochromism to form isomer 1 oc. When irradiated with 312 nm, the stepwise photocyclization reactions occurred in diarylethene dimer through the line of 1 oo to 1 oc to 1 cc.展开更多
基金National Natural Science Foundation of China(20564001)the Natural Science Foundation of Jiangxi,China(0620012)the Science Funds of theEducation Office of Jiangxi,China([2005]279).
文摘In order to minimize the pollution of ferrous sulfate, a by-product of titanium dioxide, and increase the yield of synthetic ester, the SO 2- <sub>4/Fe2O3 nanosolid superacid has been produced by chemical precipitation and its micrographs was determined by SEM. The effect of preparation conditions of SO 2- <sub>4/Fe2O3 nanosolid superacid on catalysis synthesis butyl acetate and synthesis conditions of butyl acetate were studied.From experimental data,as compared with liquid acid, SO 2- <sub>4/Fe2O 3 nanosolid superacid showed higher catalytic performance in catalytic synthesis of butyl acetate,and the yield of butyl acetate was obviously increased in the same reaction time.
基金National Natural Science Foundation of China(20564001)the Natural Science Foundation of Jiangxi,China(050017 and 0620012)the Science Funds of the Education Office of Jiangxi,China([2007]279).
基金Supported by the Project of Natural Science Foundation of Jiangxi Province(2010GZH0040,2010GQH0039)the Project of Jiangxi Youth Scientist,and Science Funds of the Education Office of Jiangxi Province(2010DQ00200,GJJ1067,GJJ11690)
文摘A new family of photochromic diarylethene compounds, 1-（2-methyl-5-formyl-3- thienyl）-2-（2-methoxylphenyl）perfluorocyclopentene （1o） having an unsymmetrically substituted hexafluorocyclopentene unit, was synthesized and its structure was determined. The crystal belongs to the monoclinic system, space group P21/c with a = 15.4866（5）, b = 9.0744（9）, c = 12.6906（3）, β = 90.1480（10）°, Z = 4, V = 1783.4（3）3, Dc = 1.513 mg/m3, μ = 0.25, F（000） = 824, the final R = 0.0579 and wR = 0.1566 for 2584 observed reflections （I 2σ（I））. Interestingly, a colorless compound 1o undergoes photocyclization upon irradiation of UV light to give the blue isomer diarylethene. Upon irradiation with visible light with wavelength greater than 510 nm, the blue compound can return to its initial colorless state.
基金the National Natural Science Foundation of China(21101081)the Project of the Science Funds of Jiangxi Education Office(GJJ14235)+1 种基金Science Founds of StateK ey Laboratory of Structural Chemistry(20130011)Hunan Province Project of Science and Technology(2014FJ6032)
文摘The ionothermal reaction of Zn（NO3）2·6H2O with 5-sulfoisophthalic acid monosodium salt（NaH2SIP） and 1,2,4-triazole in 1-ethyl-3-methylimidazolium tetrafluoroborate（EMIM-BF4） ionic liquid has afforded the compound {（EMIM）[Zn（SIP）]}n（1）.The Zn（Ⅱ） ions are linked by the carboxylate groups of SIP^3- ligands to give a two-dimensional layered structure featuring the centrosymmetric dinuclear Zn2（μ2-COO）2 units.The adjacent two-dimensional layers are further linked by the Zn-0 bonds between the Zn（Ⅱ） ions and the sulfonate O atoms to generate a three-dimensional anionic[Zn（SIP）]n^n- framework featuring one-dimensional open channels propagating along the a axis.The imidazolium cations[EMIM]^＋ derived from ionic liquid act as extraframework charge-balancing species for the anionic[Zn（SIP）]n^n- framework and occupy the void space of the one-dimensional open channels.The rich ionic environments of the ionic liquid may be particularly helpful in the formation of the ionic compound 1.The roles of the ionic liquid in ionothermal synthesis and crystallization of the compound are briefly discussed.Furthermore,compound 1 displays a photoluminescent emission at 490 nm upon excitation at 406 nm.
基金Supported by the National Natural Science Foundation of China(51373072,21363009)the Project of Natural Science Foundation of Jiangxi Province(20142BAB203005)the Program for the Top Young Innovative Talents in University(2013QNBJRC002)
文摘A new photochromic diarylethene, [1-（2-methyl-5-（4-chlorophenyl）-3-thienyl-2-（2- methoxylphenyl）]perfluorocyclopentene （1o, C23HIsC1F6OS） was synthesized and its structure was determined by single-crystal X-ray diffraction analysis. The crystal belongs to the triclinic system, space group Pi with a = 9.421（1）, b = 10.4664（1）, c = 11.2988（2）, α= 88.014（1）, β= 76.976（1）,γ= 82.319（1）°, Z= 2, V= 1075.7（2） A3, Dc = 1.509 mg/m3, μ= 0.339 mm-1, F（000） = 496, the final R = 0.0353 and wR = 0.0922 for 3303 observed reflections （I 〉 2σ（I））. Further study demonstrated this compound underwent reversible photochromism with high contrast color-switching between colorless and blue in hexane. Upon UV/Vis irradiation, the fluorescence quenching efficiency can be attached to ca. 98% and recover to the initial state which exhibits high contrast fluorescentswitching between ＂on＂ and ＂off＂ states.
基金Supported by the National Natural Science Foundation of China(21701065)"5511" Science and Technology Innovation Talent Project of Jiangxi Province(20165BCB18015)+2 种基金the Project of Natural Science Foundation of Jiangxi Province(20171ACB20025,20171BAB203011)the Project of the Science Funds of Jiangxi Education Office(GJJ170659)the Project of Jiangxi Advantage Sci-Tech Innovative Team(20142BCB24012)
文摘The crystal structure of fused photochromic diarylethene dimer, 1,4-bis-[4-(4-{2-(5-phenyl)-2-methyl-thiophen-3-yl]-3,3,4,4,5,5-hexafluoro-cyclopent-1-enyl}-5-methyl-thiophen-2-yl) buta-1,3-diyne(1 oo, C46 H23 F12 S4) was determined by single-crystal X-ray diffraction analysis. This crystal belongs to the triclinic system, space group P1 with a = 7.546(3), b = 8.869(3), c = 16.196(5), α = 98.000(4)°, β = 100.803(4)°, γ = 98.449(4)°, Z = 2, V = 1037.6(6) ?~3, Dc = 1.496 mg/m^3, μ = 0.317, F(000) = 474, the final R = 0.0428 and wR = 0.1199 for 4115 observed reflections(I > 2σ(I)). Further study demonstrated this compound underwent reversible photochromism with color-switching between colorlessness and green in crystalline state. Upon 365 nm irradiation, the diarylethene shows one step photochromism to form isomer 1 oc. When irradiated with 312 nm, the stepwise photocyclization reactions occurred in diarylethene dimer through the line of 1 oo to 1 oc to 1 cc.
