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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Novel vanadium compounds with 2-pyridylbenzimidazole
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Novel vanadium compounds with 2-pyridylbenzimidazole

机译：新型钒化合物与2-吡啶基苯并咪唑

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摘要

The coordination behaviour of Hpybz (2-pyridylbenzimidazole) towards vanadium in various oxidation states (i.e. +Ⅲ/IV/V) has been explored. The six-coordinate complex cis-[V~VO_2(Hpybz)(pybz)] (1) was isolated as the CH_3OH?(H_2O)_2 hydrate from the reaction of NH_4VO_3 and Hpybz in aqueous methanol. The crystal structure shows that vanadium is bonded to two cis-oxido ligands, and to the two bidentate ligands pybz and Hpybz. This combination of ligands confers six-coordination on the metal centre, which is a rare coordination number for a mononuclear dioxido complex of vanadium(V). From the reaction between Hpybz and VCl_3 the cationic complex salt cis-[V~Ⅲ(OH)_2(Hpybz)_2]Cl (2) was formed. The ligands in 2 exhibits the same coordination behaviour as in 1, but instead of the dioxido moiety present in 1, two hydroxyl co-ligands are coordinated to the metal centre, with both chelator ligands being neutral. Conductivity measurements in DMF affirmed that the compound is a 1:1 electrolyte. A novel binuclear mixed-valence oxidovanadium compound (l-O)[V~VO(pybz)_2?V~ⅣO(Hpybz)(acac)] (3), was obtained from the reaction of Hpybz with VO(acac)_2. ESR analysis illustrates paramagnetic behaviour, typical of a type I dimer. These compounds were fully characterized by means of conductance measurements, UV-Vis, IR and NMR spectroscopy and by single crystal X-ray diffraction.
机译：探索了Hpybz（2-吡啶基苯并咪唑）在各种氧化态（+Ⅲ/ IV / V）下对钒的配位行为。从NH_4VO_3与Hpybz在甲醇水溶液中的反应中分离出CH_3OH？（H_2O）_2水合物，生成六坐标的顺式[V〜VO_2（Hpybz）（pybz）]（1）。晶体结构表明，钒与两个顺式-配体以及两个双齿配体pybz和Hpybz结合。配体的这种组合在金属中心赋予六配位，这对于钒（V）的单核二氧化物配合物而言是罕见的配位数。由Hpybz和VCl_3之间的反应，形成阳离子配盐顺-[V〜Ⅲ（OH）_2（Hpybz）_2] Cl（2）。 2中的配体表现出与1中相同的配位行为，但是取代了1中存在的双氧部分，两个羟基共配体与金属中心配位，两个螯合配体均为中性。在DMF中进行电导率测量确认该化合物为1：1电解质。通过Hpybz与VO（acac）_2的反应获得了一种新型的双核混合价氧化钒化合物（l-O）[V〜VO（pybz）_2→V〜ⅣO（Hpybz）（acac）]（3）。 ESR分析说明了I型二聚体的典型顺磁特性。这些化合物通过电导测量，UV-Vis，IR和NMR光谱以及单晶X射线衍射得到充分表征。

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