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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Dioxovanadium(V) complexes with N,N,O-donor monoanionic ligands: Synthesis, structure and properties
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Dioxovanadium(V) complexes with N,N,O-donor monoanionic ligands: Synthesis, structure and properties

机译：具有N，N，O供体单阴离子配体的二氧钒钒（V）配合物：合成，结构和性质

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摘要

Dioxovanadium(V) complexes having the general formula [VO2(phsalR)] have been synthesized in 52–63% yields by reacting one mole equivalent each of VOSO4 · 5H2O, 4-R-2-(pyridin-2-yl-hydrazonomethyl)-phenols (HphsalR, where R = H, OCH3, Cl, Br and NO2) and N(C2H5)3 in water–acetonitrile (1:1.3) mixture. The complexes have been characterized by elemental analysis, magnetic susceptibility and spectroscopic (IR, UV–Vis, NMR and EPR) measurements. The physical properties of the complexes are consistent with the +5 oxidation state of the metal ion in them. The X-ray structure of a representative complex, [VO2(phsal)] (R = H) has been determined. The metal centre in [VO2(phsal)] is in square-pyramidal N2O3 coordination sphere. The monoanionic pyridine-N, imine-N and phenolate-O donor phsal? and one of the two oxo groups form the N,N,O,O basal plane and the other oxo group satisfies the fifth apical coordination site. This square-pyramidal molecules form weakly associated dimeric units due to the participation of the oxo group at the basal plane in the V–O–V bridge formation. The structure of [VO2(phsal)]2 can be described as two edge-shared VN2O4 octahedra. In the crystal lattice, these dimeric units form infinite one-dimensional chain structure via intermolecular N–HOV hydrogen bonding interaction.
机译：通过使一摩尔当量的VOSO4·5H2O，4-R-2-（吡啶-2-基-肼基甲基）反应，可以合成具有通式[VO2（phsalR）]的二氧钒钒（V）络合物，产率为52-63％。 -乙腈（HphsalR，其中R = H，OCH3，Cl，Br和NO2）和N（C2H5）3在水-乙腈（1：1.3）混合物中的分布。通过元素分析，磁化率和光谱（IR，UV-Vis，NMR和EPR）测量对复合物进行了表征。配合物的物理性质与其中金属离子的+5氧化态一致。已确定代表性复合物[VO2（phsal）]（R = H）的X射线结构。 [VO2（phsal）]中的金属中心位于四角锥N2O3配位球中。单阴离子吡啶-N，亚胺-N和酚盐-O供体的邻苯二甲酸酯？两个氧代基团中的一个形成N，N，O，O基面，另一个氧代基团满足第五根顶端协调位点。由于氧代基团在V–O–V桥基的基础平面上的参与，该方形金字塔形分子形成了弱关联的二聚体单元。 [VO2（phsal）] 2的结构可以描述为两个边缘共享的VN2O4八面体。在晶格中，这些二聚体单元通过分子间N–HOV氢键相互作用形成无限一维链结构。

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