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Fluorimetric Detection of Phosphates in Water Using a Disassembly Approach: A Comparison of FeIII‐, ZnII‐, MnII‐ and MnIII‐salen Complexes
Zeitschrift für anorganische und allgemeine Chemie ( IF 1.1 ) Pub Date : 2020-05-27 , DOI: 10.1002/zaac.202000045
Daniela Winkler 1 , Sophie Banke 1 , Philipp Kurz 1
Affiliation  

Details of the reaction sequence used for the fluorimetric detection of phosphates by disassembly of transition metal Schiff base complexes were investigated for [FeIII(salen)(H2O)]+, [ZnII(salen)], [MnII(salen)(H2O)2], and [MnIII(salen)(H2O)]+. The reactivity of these compounds towards phosphorus oxoanions of differing charge, number of donor atoms and steric hindrance was detected by UV/Vis and fluorescence spectroscopy in both aprotic organic and aqueous media. Selectivity of [FeIII(salen)(H2O)]+ towards pyrophosphate over all other tested phosphorus‐containing analytes was strongly supported. [ZnII(salen)] showed a faster reactivity but was much less selective. In contrast, [MnIII(salen)(H2O)]+ proved to be more stable than the iron complex but generally showed little reactivity towards phosphorus oxoanions. The influence of the charge of the central atom was investigated using the MnII analogue [MnII(salen)(H2O)2]. As expected, the reduced charge resulted in a reactivity comparable to the ZnII complex in organic solution but lead to hydrolysis of the complex in water. Finally, the reaction products of [FeIII(salen)(H2O)]+ with phosphates were characterized by IR spectroscopy and mass spectrometry, providing further insights into the reaction mechanism of the disassembly process.

中文翻译:

使用拆卸方法荧光检测水中的磷酸盐:FeIII-,ZnII-,MnII-和MnIII-salen配合物的比较

研究了通过[Fe III(salen)(H 2 O)] +,[Zn II(salen)],[Mn II(salen )分解过渡金属席夫碱配合物进行荧光荧光检测磷酸盐的反应顺序的细节。)(H 2 O)2 ]和[Mn III(salen)(H 2 O)] +。在非质子有机介质和水性介质中,通过UV / Vis和荧光光谱法检测了这些化合物对不同电荷,施主原子数和空间位阻的磷氧阴离子的反应性。[Fe III(salen)(H 2 O)]的选择性+相对于所有其他经过测试的含磷分析物而言,对焦磷酸盐的分析得到了大力支持。[Zn II(salen)]显示出较快的反应性,但选择性低得多。相反,[Mn III(salen)(H 2 O)] +被证明比铁络合物更稳定,但通常对磷氧阴离子的反应性很小。使用Mn II类似物[Mn II(salen)(H 2 O)2 ]研究中心原子电荷的影响。如预期的那样,减少的电荷导致反应性与Zn II相当有机溶液中的络合物,但会导致络合物在水中水解。最后,通过红外光谱和质谱对[Fe III(salen)(H 2 O)] +与磷酸盐的反应产物进行了表征,从而进一步了解了分解过程的反应机理。
更新日期:2020-05-27
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