Gold nanoparticles （Au NPs） can serve as visualized colorimetric probes for various targets and modification-free sensing strategies are preferred. The donor-acceptor interaction between the electron-rich melamine ...Gold nanoparticles （Au NPs） can serve as visualized colorimetric probes for various targets and modification-free sensing strategies are preferred. The donor-acceptor interaction between the electron-rich melamine （MA） and the electron-deficient trinitrotoluene （TNT） allows formation of a supramolecule in aqueous solution. Melamine alone makes the initially individual reddish Au NPs aggregate into gray/blue Au NP assemblies due to melamine forming multiple ligand sites toward the Au NPs. Interestingly, the preformed supramolecule of MA-TNT disenables aggregation of the Au NPs. Therefore the unmodified Au NPs provide facile colorimetric probes for TNT detection in aqueous solution. Rapid identification of TNT is established by naked eye inspection. By using spectrophotometer tools, quantification of TNT is accomplished with a linear range of 80μmol L-1 to 1.2 mmol/L-1 and a limit of detection （LOD） of 27μmol/L^-1. In contrast to previous strategy with surface-modified Au NPs, here a modification-free sensing strategy for TNT assay has been developed with greater convenience, rapidity, and cost-effectiveness.展开更多
以4,8-二酮苯并[1,2-b∶4,5-b']二噻吩为原料,合成了两种新型的2,2'∶6',2″-三联吡啶修饰的苯并二噻吩电子给-受体结构分子(M1和M2),其结构经~1H NMR,^(13)C NMR,IR和元素分析表征。用UV-Vis,FL,TGA和CV研究了M1和M2的性...以4,8-二酮苯并[1,2-b∶4,5-b']二噻吩为原料,合成了两种新型的2,2'∶6',2″-三联吡啶修饰的苯并二噻吩电子给-受体结构分子(M1和M2),其结构经~1H NMR,^(13)C NMR,IR和元素分析表征。用UV-Vis,FL,TGA和CV研究了M1和M2的性能。结果表明:M1和M2均具有良好的热稳定性,热分解温度(T_5)分别为335℃和430℃。由于电子给-受体结构的存在,M1和M2均表现出明显的分子内电荷转移跃迁(ICT),其最大吸收峰分别为446 nm和468 nm,荧光发射峰分别为517 nm和552 nm;起始还原电位分别为-0.57 e V和-0.62 e V,起始氧化电位分别为0.69 e V和0.87 e V。展开更多
基金supported by National Natural Science Foundation of China (No.21375036)the Open Project Program of Key Laboratory of Theoretical Chemistry and Molecular Simulation of Education,Hunan University of Science and Technology (No.E21201)
文摘Gold nanoparticles （Au NPs） can serve as visualized colorimetric probes for various targets and modification-free sensing strategies are preferred. The donor-acceptor interaction between the electron-rich melamine （MA） and the electron-deficient trinitrotoluene （TNT） allows formation of a supramolecule in aqueous solution. Melamine alone makes the initially individual reddish Au NPs aggregate into gray/blue Au NP assemblies due to melamine forming multiple ligand sites toward the Au NPs. Interestingly, the preformed supramolecule of MA-TNT disenables aggregation of the Au NPs. Therefore the unmodified Au NPs provide facile colorimetric probes for TNT detection in aqueous solution. Rapid identification of TNT is established by naked eye inspection. By using spectrophotometer tools, quantification of TNT is accomplished with a linear range of 80μmol L-1 to 1.2 mmol/L-1 and a limit of detection （LOD） of 27μmol/L^-1. In contrast to previous strategy with surface-modified Au NPs, here a modification-free sensing strategy for TNT assay has been developed with greater convenience, rapidity, and cost-effectiveness.
文摘以4,8-二酮苯并[1,2-b∶4,5-b']二噻吩为原料,合成了两种新型的2,2'∶6',2″-三联吡啶修饰的苯并二噻吩电子给-受体结构分子(M1和M2),其结构经~1H NMR,^(13)C NMR,IR和元素分析表征。用UV-Vis,FL,TGA和CV研究了M1和M2的性能。结果表明:M1和M2均具有良好的热稳定性,热分解温度(T_5)分别为335℃和430℃。由于电子给-受体结构的存在,M1和M2均表现出明显的分子内电荷转移跃迁(ICT),其最大吸收峰分别为446 nm和468 nm,荧光发射峰分别为517 nm和552 nm;起始还原电位分别为-0.57 e V和-0.62 e V,起始氧化电位分别为0.69 e V和0.87 e V。
