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Metal-Controlled Anion-Binding Tendencies of the Thiourea Unit of Thiosemicarbazones

机译:硫代氨基脲的硫脲单元的金属控制阴离子结合趋势

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摘要

The terdentate ligand 3 (LH, 2-formylpyridine 4-thiosemicarbazone) forms with Fell and Ni-II 2:1 complexes of octahedral geometry of formula [M-II(LH)(2)](2+). X-ray diffraction studies have shown that in both complexes the thiourea moieties of the coordinated thiosemicarbazones are exposed to the outside and are prone to establish hydrogen-bonding bifurcate interactions with oxoanions. However. spectrophotometric studies in CHCl3, solution have shown that only the poorly basic NO3- ion is able to form authentic hydrogen-bond complexes will, thiourea subunits, whereas all the other investigated anions (CH3COO-, NO2-, F-) induce deprotonation of the N-H fragment. The extreme enhancement of the thiourea acidity is based oil the coordinative interaction of the sulphur atom, with the metal, which stabilises the thiolate form and it is much hi her than that exerted by any other covalently linked electron-withdrawing sub-stituent, for example, -NO2.
机译:齿状配体3(LH,2-甲酰基吡啶4-硫代半碳酮)与式[M-II(LH)(2)](2+)的八面体几何结构的Fell和Ni-II 2:1配合物形成。 X射线衍射研究表明,在两种配合物中,配位的硫代半氨基甲酮的硫脲部分都暴露在外面,并易于与氧阴离子建立氢键合的分叉相互作用。然而。在CHCl3溶液中的分光光度研究表明,只有碱性较差的NO3-离子才能形成真实的氢键络合物,才会成为硫脲亚基,而所有其他研究过的阴离子(CH3COO-,NO2-,F-)均会引起去质子化。 NH片段。硫脲酸度的极大提高是基于油中硫原子与金属的配位相互作用,这种相互作用稳定了硫醇盐的形式,并且比任何其他共价键合的吸电子取代基所发挥的作用要高得多。 ,-NO2。

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