Specific fluorophore was introduced into ionic liquid based on its tunability,thus a kind of novel fluorescent ionic liquid probe[P66614][HQS]was designed,synthesized and characterized.Compared with non-fluorescent HQ...Specific fluorophore was introduced into ionic liquid based on its tunability,thus a kind of novel fluorescent ionic liquid probe[P66614][HQS]was designed,synthesized and characterized.Compared with non-fluorescent HQS,ionic liquid[P66614][HQS]emitted a certain amount of fluorescence,which could be attributed to the well-delocalized frontier orbitals and its charge transfer character,as demonstrated by quantum chemical calculation.Considering the interaction of[P66614][HQS]with metal ions,the application for detecting specific substance as a chemical sensor,such as Al3+was investigated.Compared with the traditional probe HQS,significant improvements in Al^3+detecting was achieved by[P66614][HQS]with stronger binding ability,better sensitivity and selectivity.The better performance of[P66614][HQS]was contributed to the changed charge distribution,leading to the stronger binding interaction.We believe that this new fluorescent ionic liquid exhibited unique properties in detecting Al^3+in aqueous solution,which would broaden the application of ionic liquids.展开更多
A furaldehyde Schiff base, 4-[（2-furanylmethylene）amino]phenol（FMAP）, was synthesized and fully characterized by elemental analysis, ^1H-NMR, IR, MS, UV-Vis, fluorescence and single-crystal X-ray diffraction. It c...A furaldehyde Schiff base, 4-[（2-furanylmethylene）amino]phenol（FMAP）, was synthesized and fully characterized by elemental analysis, ^1H-NMR, IR, MS, UV-Vis, fluorescence and single-crystal X-ray diffraction. It crystallizes in the monoclinic system, space group P2_1/n with a = 6.2566（6）, b = 13.2273（11）, c = 11.3056（9） A, β = 93.1800（10）o, V = 934.19（14） A^3, Z = 4, M_r = 187.19, D_c = 1.331 g/cm^3, λ = 0.71073 a, F（000） = 392, GOOF = 1.022, R = 0.0396 and wR = 0.0992 for 4569 observed reflections with I 〉 2σ（I）. Fluorescent spectroscopic investigation revealed that the Schiff base exhibited a high selectivity and sensitivity toward Al^3＋ over other common metal ions in ethanol solution, and the detection limit of Al^3＋ is up to 1.2 × 10^-7 M. The mass spectra and Job＇s plot analysis confirm the 1：1 stoichiometry between FMAP and Al^3＋.展开更多
A novel ZnII-based metal-organic framework with the formula of{[Zn_(2)(BBIP)_(2)(NDC)_(2)]·H_(2)O}n(JXUST-5)derived from 3,5-bis(benzimidazol-1-yl)pyridine(BBIP)and 1,4-naphthalenedicarboxylic acid(H_(2)NDC)has b...A novel ZnII-based metal-organic framework with the formula of{[Zn_(2)(BBIP)_(2)(NDC)_(2)]·H_(2)O}n(JXUST-5)derived from 3,5-bis(benzimidazol-1-yl)pyridine(BBIP)and 1,4-naphthalenedicarboxylic acid(H_(2)NDC)has been synthesized.The adjacent Zn^(II)ions are linked through two BBIP ligands to form a[Zn_(2)(BBIP)_(2)]secondary building unit(SBU).The neighbouring SBUs are further connected by NDC^(2-)withμ2-η^(1):η^(1)andμ2-η^(1):η^(1):η^(1)bridging modes to form a two-dimensional(2D)framework.Topological analysis shows that JXUST-5 could be simplified as an uninodal fes topology with a point symbol of{4.8^(2)}.Furthermore,the 2D framework net could be extended through C-H···πinteraction to form the three-dimensional supramolecular structure.Luminescent experiments suggest that JXUST-5 could selectively and sensitively recognize Al^(3+)and Ga^(3+)through fluorescence enhancement effect along with a relatively large red shift.The detection limits for Al^(3+)and Ga^(3+)are 0.17 and 0.69 ppm,respectively.Interestingly,the sensing process for both Al^(3+)and Ga^(3+)could be directly observed with naked eyes under 365 nm UV lamp.Notably,JXUST-5 could be recycled at least five times as a fluorescent sensor toward Al^(3+)and Ga^(3+),which is the second example of turn-on MOF based fluorescent sensor toward Ga^(3+).展开更多
A new europium complex Eu(tta)_(3)Li(la)based on 1,10-phenanthroline derivative(Li=(2-(3,5-dimethoxyphenyl)-1 H-imidazo[4,5-f][1,10]phenanthroline),tta=2-thenoyItrifluoroacetone)was designed and synthesized.Its struct...A new europium complex Eu(tta)_(3)Li(la)based on 1,10-phenanthroline derivative(Li=(2-(3,5-dimethoxyphenyl)-1 H-imidazo[4,5-f][1,10]phenanthroline),tta=2-thenoyItrifluoroacetone)was designed and synthesized.Its structure was characterized by^(1)H and^(13)C NMR,elemental analysis,UV-vis,fluorescence spectra and single crystal X-ray diffraction.The crystal of the complex la belongs to monoclinic system with the space group P2_(1/n).The europium complex la in the solid and in the solution displays the typical emission of Eu(III)ion centered at 612 nm as a result of the electric dipole transition(^(5)D_(0)-►^(7)F_(2)).It exhibits high quantum yield(20.42%),long lifetime(0.29 ms)and good CIE color coordinate(0.67,0.33)in solid.In addition,the complex shows high sensitivity and selectivity towards Al^(3+)and Zn^(2+)in methanol solution which can be attributed to the Al^(3+)/Zn^(2+)cation instead of Eu^(3+)in the complex la.The LODs for Al^(3+)and Zn^(2+)were calculated to be 5.880×10^(-7)and 7.678×10^(-8)mol/L,respectively.Besides,the additions of Al^(3+)and Zn^(2+)express remarkable color changes from red to bright blue and ivory that can be clearly observed by the naked eye respectively.展开更多
基金We acknowledge the support of the National Key Basic Research Program of China(2015CB251401)the Natural Science Foundation of China(21776239)+1 种基金Zhejiang Provincial Natural Science Foundation of China(LZ17B060001)the Fundamental Research Funds of the Central Universities,the instrument support of professor Peng Xiaogang,professor Jin Yizheng and associate professor Qin Haiyan.
文摘Specific fluorophore was introduced into ionic liquid based on its tunability,thus a kind of novel fluorescent ionic liquid probe[P66614][HQS]was designed,synthesized and characterized.Compared with non-fluorescent HQS,ionic liquid[P66614][HQS]emitted a certain amount of fluorescence,which could be attributed to the well-delocalized frontier orbitals and its charge transfer character,as demonstrated by quantum chemical calculation.Considering the interaction of[P66614][HQS]with metal ions,the application for detecting specific substance as a chemical sensor,such as Al3+was investigated.Compared with the traditional probe HQS,significant improvements in Al^3+detecting was achieved by[P66614][HQS]with stronger binding ability,better sensitivity and selectivity.The better performance of[P66614][HQS]was contributed to the changed charge distribution,leading to the stronger binding interaction.We believe that this new fluorescent ionic liquid exhibited unique properties in detecting Al^3+in aqueous solution,which would broaden the application of ionic liquids.
基金supported by Teaching Reform Innovation Program of Higher Education Institutions in Shanxi(Nos.J2016090 and J2017092)Soft Science Project of Shanxi Province(No.2016042008-1)
文摘A furaldehyde Schiff base, 4-[（2-furanylmethylene）amino]phenol（FMAP）, was synthesized and fully characterized by elemental analysis, ^1H-NMR, IR, MS, UV-Vis, fluorescence and single-crystal X-ray diffraction. It crystallizes in the monoclinic system, space group P2_1/n with a = 6.2566（6）, b = 13.2273（11）, c = 11.3056（9） A, β = 93.1800（10）o, V = 934.19（14） A^3, Z = 4, M_r = 187.19, D_c = 1.331 g/cm^3, λ = 0.71073 a, F（000） = 392, GOOF = 1.022, R = 0.0396 and wR = 0.0992 for 4569 observed reflections with I 〉 2σ（I）. Fluorescent spectroscopic investigation revealed that the Schiff base exhibited a high selectivity and sensitivity toward Al^3＋ over other common metal ions in ethanol solution, and the detection limit of Al^3＋ is up to 1.2 × 10^-7 M. The mass spectra and Job＇s plot analysis confirm the 1：1 stoichiometry between FMAP and Al^3＋.
基金supported from the National Natural Science Foundation of China(Nos.22061019,21761012 and 21861018)the Natural Science Foundation of Jiangxi Province(Nos.20192BAB203001,20202ACBL213001,20192ACBL20013 and 20182BCB22010)+1 种基金the Youth Jinggang Scholars Program in Jiangxi Province(No.QNJG2019053)the Two Thousand Talents Program in Jiangxi Province(No.jxsq2019201068)。
文摘A novel ZnII-based metal-organic framework with the formula of{[Zn_(2)(BBIP)_(2)(NDC)_(2)]·H_(2)O}n(JXUST-5)derived from 3,5-bis(benzimidazol-1-yl)pyridine(BBIP)and 1,4-naphthalenedicarboxylic acid(H_(2)NDC)has been synthesized.The adjacent Zn^(II)ions are linked through two BBIP ligands to form a[Zn_(2)(BBIP)_(2)]secondary building unit(SBU).The neighbouring SBUs are further connected by NDC^(2-)withμ2-η^(1):η^(1)andμ2-η^(1):η^(1):η^(1)bridging modes to form a two-dimensional(2D)framework.Topological analysis shows that JXUST-5 could be simplified as an uninodal fes topology with a point symbol of{4.8^(2)}.Furthermore,the 2D framework net could be extended through C-H···πinteraction to form the three-dimensional supramolecular structure.Luminescent experiments suggest that JXUST-5 could selectively and sensitively recognize Al^(3+)and Ga^(3+)through fluorescence enhancement effect along with a relatively large red shift.The detection limits for Al^(3+)and Ga^(3+)are 0.17 and 0.69 ppm,respectively.Interestingly,the sensing process for both Al^(3+)and Ga^(3+)could be directly observed with naked eyes under 365 nm UV lamp.Notably,JXUST-5 could be recycled at least five times as a fluorescent sensor toward Al^(3+)and Ga^(3+),which is the second example of turn-on MOF based fluorescent sensor toward Ga^(3+).
基金Project supported by the National Natural Science Foundation of China.China(21861017,41867053)the Key Project of Natural Science Foundation of Jiangxi Province,China(20192ACBL20011).
文摘A new europium complex Eu(tta)_(3)Li(la)based on 1,10-phenanthroline derivative(Li=(2-(3,5-dimethoxyphenyl)-1 H-imidazo[4,5-f][1,10]phenanthroline),tta=2-thenoyItrifluoroacetone)was designed and synthesized.Its structure was characterized by^(1)H and^(13)C NMR,elemental analysis,UV-vis,fluorescence spectra and single crystal X-ray diffraction.The crystal of the complex la belongs to monoclinic system with the space group P2_(1/n).The europium complex la in the solid and in the solution displays the typical emission of Eu(III)ion centered at 612 nm as a result of the electric dipole transition(^(5)D_(0)-►^(7)F_(2)).It exhibits high quantum yield(20.42%),long lifetime(0.29 ms)and good CIE color coordinate(0.67,0.33)in solid.In addition,the complex shows high sensitivity and selectivity towards Al^(3+)and Zn^(2+)in methanol solution which can be attributed to the Al^(3+)/Zn^(2+)cation instead of Eu^(3+)in the complex la.The LODs for Al^(3+)and Zn^(2+)were calculated to be 5.880×10^(-7)and 7.678×10^(-8)mol/L,respectively.Besides,the additions of Al^(3+)and Zn^(2+)express remarkable color changes from red to bright blue and ivory that can be clearly observed by the naked eye respectively.
