Detection of trace manganese (Ⅱ) ion (Mn 2+ ) is crucial to water safety. Here, commercially available PS-DVB microspheres were sulfonated and then filled into the SPE column in order to separate Mn 2+ from complex matrices. Meanwhile, europium (III) complex was prepared with a simple “one pot” method, and its fluorescence intensity was quenched gradually with the increase of Mn 2+ concentration. Europium (III) complex combined with home-made SPE column was utilized for highly selective and sensitive measurement of Mn 2+ . The detectable concentrations of Mn 2+ can be low as 0.2 μM, which was less than the drinking water guidelines. Consequently, this new method is promising to assess the content of Mn 2+ rapidly and accurately in real-world water samples.
Under hydrothermal condition, the reaction of 2,4-dichlorophenoxyacetic acid (2,4-DH) and 1,3-bis(4-pyridyl)propane with MnCl 2 ·2H 2 O gave a novel metal-organic framework (MOF), [Mn(2,4-D) 2 (H 2 O) 2 ] n ( 1 ). This complex was characterized by IR, elemental analysis, powder X-ray diffraction, and thermogravimetry analysis. X-Ray single-crystal diffraction shows that the Mn(II) ions are bidendate bridged by carboxyl groups in the syn–anti mode, giving a two-dimensional (2D) network. Temperature-dependent magnetic studies reveal that there are weak antiferromagnetic exchange interactions between the Mn(II) ions transmitted by carboxyl groups.
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