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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Multinuclear NMR spectroscopic and theoretical study on the interactions between diperoxovanadate complex and picoline-like ligands
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Multinuclear NMR spectroscopic and theoretical study on the interactions between diperoxovanadate complex and picoline-like ligands

机译:二氧杂钒酸盐配合物与甲基吡啶样配体相互作用的多核NMR光谱和理论研究

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摘要

To understand the substituting effects of organic ligands on the reaction equilibrium, the interactions between diperoxovanadate complex [OV(O-2)(2)(H2O)](-) and a series of picoline-like ligands in solution were explored using ID multinuclear (H-1, C-13, and V-51) magnetic resonance, 2D diffusion ordered spectroscopy (DOSY), and variable temperature NMR in 0.15 mol/l NaCl ionic medium for mimicking the physiological conditions. The order of reactive capability of the picoline-like ligands with [OV(O-2)(2)(H2O)](-) is found to be picolinamide > N-methylpicolinamide > methyl picolinate > ethyl picolinate, propyl picoliniate > isopropyl picolinate. The substituting group influences the reactivity by either steric effect or electron-donating effect. Competitive coordination interactions result in a series of new seven-coordinated peroxovanadate species [OV(O-2)(2)L](-) (L = picoline-like ligands). Their coordination ways were confirmed by density functional calculations. (c) 2005 Elsevier B.V. All rights reserved.
机译:为了解有机配体对反应平衡的取代作用,使用ID多核化合物探索了二过氧钒酸盐络合物[OV(O-2)(2)(H2O)](-)与溶液中一系列甲基吡啶样配体之间的相互作用(H-1,C-13和V-51)磁共振,二维扩散有序光谱法(DOSY)和0.15 mol / l NaCl离子介质中的可变温度NMR,用于模拟生理条件。甲基吡啶样配体与[OV(O-2)(2)(H2O)](-)的反应能力顺序为:吡啶甲酸酰胺> N-甲基吡啶甲酸酰胺>吡啶甲酸甲酯>吡啶甲酸乙酯,吡啶甲酸丙酯>吡啶甲酸异丙酯。取代基通过空间效应或供电子效应影响反应性。竞争性配位相互作用导致一系列新的七配位过氧钒酸盐物种[OV(O-2)(2)L](-)(L =甲基吡啶样配体)。通过密度泛函计算确定了它们的配合方式。 (c)2005 Elsevier B.V.保留所有权利。

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