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首页> 外文期刊>Journal of Inorganic Biochemistry: An Interdisciplinary Journal >Synthesis and characterization of fluoride-incorporated polyoxovanadates
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Synthesis and characterization of fluoride-incorporated polyoxovanadates

机译：含氟的聚氧钒酸盐的合成与表征

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摘要

The speciation studies of oxovanadates are essential to clarify their biological activities. We surveyed the distribution of oxovanadate species in the presence of halide anions with various acid concentrations in an aqueous mixed-solvent system. The presence of chloride, bromide, and iodide anions has no effects on the appearance of polyoxovanadate species observed in V-51 NMR. Those are the precedent formation of metavanadate species and decavanadates. The presence of fluoride anion during the addition of acids exhibits strong intervention in the polyoxovanadate equilibria and we found the subsequent formation of two polyoxovanadate species by V-51 NMR observation. From the estimated experimental condition, we isolated fluoride-incorporated polyoxovanadates {Et4N}(4)[V7O19F] and {Et4N}(4)[HV11O29F2], successfully. Polyanion[V7O19F](4-) is the fluoride-incorporated all V(V) state polyoxovanadate which has two different coordination environments of tetrahedral and square pyramidal vanadium units within the one anionic structural integrity. The structural gap between tetrahedral-unit-based metavanadate and octahedral-unit-based decavanadate structures may be linked by this hybrid complex. (C) 2015 Elsevier Inc. All rights reserved.
机译：含氧钒酸盐的形态研究对于阐明其生物活性至关重要。我们调查了在水性混合溶剂系统中存在各种酸浓度的卤化物阴离子时，氧钒酸盐种类的分布。氯离子，溴离子和碘离子的存在对在V-51 NMR中观察到的聚氧钒酸盐物种的外观没有影响。这些是异钒酸盐和十钒酸盐物种的先例。加酸过程中氟阴离子的存在对聚氧钒酸盐平衡表现出强烈的干预作用，我们通过V-51 NMR观察发现随后形成了两个聚氧钒酸盐物种。从估计的实验条件，我们成功地分离了掺氟的聚氧钒酸盐{Et4N}（4）[V7O19F]和{Et4N}（4）[HV11O29F2]。聚阴离子[V7O19F]（4-）是氟化物结合的所有V（V）态聚氧钒酸盐，在一个阴离子结构完整性内，它具有两个不同的四面体和方形金字塔形钒单元配位环境。基于四面体单元的偏钒酸盐和基于八面体单元的十钒酸盐结构之间的结构间隙可以通过该杂合复合物连接。 （C）2015 Elsevier Inc.保留所有权利。

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