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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Dioxouranium complexes with acetylpyridine benzoylhydrazones and related ligands
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Dioxouranium complexes with acetylpyridine benzoylhydrazones and related ligands

机译:二氧铀鎓与乙酰吡啶苯甲酰hydr及其相关配体的配合物

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Acetylpyridine benzoylhydrazone and related ligands react with common dioxouranium(VI) compounds such as uranyl nitrate or [NBu4](2)[UO2Cl4] to form air-stable complexes. Reactions with 2,6-diacetylpyridinebis(benzoylhydrazone) (H2L1a) or 2,6-diacetylpyridinebis(salicythydrazone) (H2L1b) give yellow products of the composition [UO2(L-1)]. The neutral compounds contain doubly deprotonated ligands and possess a distorted pentagonal-bipyramidal structure. The hydroxo groups of the salicylhydrazonato ligand do not contribute to the complexation of the metal. The equatorial coordination spheres of the complexes can be extended by the addition of a monodentate ligand such as pyridine or DMSO. The uranium atoms in the resulting deep-red complexes have hexagonal-bipyramidal coordination environments with the oxo ligands in axial positions. I The sterical strains inside the hexagonal plane can be reduced when two tridentate benzoylhydrazonato ligands are used instead of the pentadentate 2,6-diacetylpyridine derivatives. Acetylpyridine benzoylhydrazone (HL2) and bis(2-pyridyl)ketone benzoylhydrazone (HL3) deprotonate and form neutral, red [UO2(L)(2)] complexes. The equatorial coordination spheres of these complexes are puckered hexagons. X-ray diffraction studies on [UO2(L-1a)(pyridine)], [UO2(L-1b)(DMSO)], [UO2(L-2)(2)] and [UO2(L-3)(2)] show relatively short U-O bonds to the benzoylic oxygen atoms between 2.328(6) and 2.389(8) Angstrom. This suggests a preference of these donor sites of the ligands over their imino and amine functionalities (U-N bond lengths: 2.588(7)-2.701(6) Angstrom).
机译:乙酰吡啶苯甲酰hydr和相关配体与常见的二氧铀鎓(VI)化合物(如硝酸铀酰或[NBu4](2)[UO2Cl4])反应形成空气稳定的络合物。与2,6-二乙酰基吡啶双(苯甲酰基hydr)(H2L1a)或2,6-二乙酰基吡啶双(水杨基dra带)(H2L1b)反应生成黄色化合物[UO2(L-1)]。中性化合物含有双去质子化的配体,并具有扭曲的五边形-双锥体结构。水杨酰肼基配体的羟基对金属的络合没有贡献。配合物的赤道配位球可通过添加单齿配体(例如吡啶或DMSO)来扩展。所得深红色络合物中的铀原子具有六边形-双锥体配位环境,且轴向位置含氧配体。当使用两个三齿的苯甲酰肼基配体代替五齿的2,6-二乙酰基吡啶衍生物时,可以减少六角形平面内的空间应变。乙酰吡啶苯甲酰((HL2)和双(2-吡啶基)酮苯甲酰((HL3)去质子化并形成中性红色[UO2(L)(2)]配合物。这些配合物的赤道协调范围是起皱的六边形。 [UO2(L-1a)(吡啶)],[UO2(L-1b)(DMSO)],[UO2(L-2)(2)]和[UO2(L-3)()的X射线衍射研究2)]显示在2.328(6)和2.389(8)埃之间与苯甲氧基原子相对较短的UO键。这表明配体的这些供体位点优于其亚氨基和胺官能度(U-N键长:2.588(7)-2.701(6)埃)。

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