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Selective picomolar level fluorometric sensing of the Cr(VI)-oxoanion in a water medium by a novel metal-organic complex

机译:新型金属-有机络合物对水介质中Cr(VI)-氧阴离子的选择性皮摩尔级荧光检测

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摘要

A novel metal-organic complex (MOC) of Cu(II) with n-butylmalonate ligands and protonated 2-aminopyridimium rings has been synthesized and structurally characterized by single-crystal X-ray diffraction. An intriguing supramolecular interaction i.e. hydrogen-bonding pattern (like N-H center dot center dot center dot O and O-H center dot center dot center dot O) assisted lone-pair/pi/pi center dot center dot center dot pi assembly is observed in the crystalline form of the MOC. The role of different non-covalent contacts in the formation of the MOC in the solid-state has also been scrutinized through Hirshfeld Surface Analysis. The luminescence properties of the MOC in the water solution were also experimentally investigated. The aqueous solution of the MOC acts as a selective picomolar level fluorescent sensor for Cr(VI)-oxoanion in water medium. Even the presence of several other cations like Li+, Na+, K+, Ca2+, Mg2+, Fe2+, Co2+, Ni2+, Cd2+, Hg2+, Zn2+, another chromium source like Cr3+ and versatile anions including F-, Cl-, Br-, SO42-, N-3(-), NO3-, BF4-, ClO4-, AsO33-, PO43- do not interfere with the picomolar level Cr(VI)-oxoanion sensing ability of the MOC in water medium. The probable sensing mechanism of the Cr(VI)-oxoanion by the MOC has been investigated experimentally and theoretically.
机译:合成了具有正丙二酸正丁酯配体和质子化的2-氨基吡啶鎓环的Cu(II)的新型金属有机配合物(MOC),并通过单晶X射线衍射对其结构进行了表征。在晶体中观察到一种有趣的超分子相互作用,即氢键合模式(如NH中心点中心点中心点O和OH中心点中心点中心点O)辅助孤对/ pi / pi中心点中心点中心点pi组装MOC的形式。还通过Hirshfeld表面分析研究了不同的非共价接触在固态MOC形成中的作用。还对MOC在水溶液中的发光性质进行了实验研究。 MOC的水溶液充当水介质中Cr(VI)-氧代阴离子的选择性皮摩尔级荧光传感器。甚至存在其他几种阳离子,如Li +,Na +,K +,Ca2 +,Mg2 +,Fe2 +,Co2 +,Ni2 +,Cd2 +,Hg2 +,Zn2 +,另一种铬源(如Cr3 +)和多种阴离子,包括F-,Cl-,Br-,SO42- ,N-3(-),NO3-,BF4-,ClO4-,AsO33-,PO43-不会干扰水介质中MOC的皮摩尔级Cr(VI)-氧阴离子的感测能力。已经通过实验和理论研究了MOC对Cr(VI)-氧代阴离子的可能的感应机理。

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