Natural abundance (25)Mg solid-state NMR of mg oxyanion systems: a combined experimental and computational study.

Natural abundance (25)Mg solid-state NMR of mg oxyanion systems: a combined experimental and computational study.
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毫克氧阴离子系统的自然丰度 (25)Mg 固态 NMR:实验和计算相结合的研究。

DOI:
10.1002/chem.200900346
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发表时间:
2009
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Cahill LS
Cahill LS
中科院分区:
--
文献类型:
--
作者:
Cahill LS

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报道了一系列自然丰度的有机和无机镁氧阴离子化合物的固态25 MG魔角旋转核磁共振(MAS核磁共振)数据。为了限制核磁共振相互作用参数(δiso,χQ,ηQ)的测定,收集了三个外磁场(11.7,14.1和18.8 T)下的数据。采用GIPAW方法,用密度泛函理论计算了相应的核磁共振参数,χQ和δiso的实验值与计算值之间建立了良好的关联性。这些关联表明,25 mg的核磁共振参数对结构非常敏感,局部镁离子环境和整体水合状态的微小变化对观测光谱有很大影响。这些观察表明,对于解决无机材料和生物相关分子中的金属中心的一些关键问题,25 mg的核磁共振光谱是一种潜在的有效的探测器。
Solid‐state25Mg magic angle spinning nuclear magnetic resonance (MAS NMR) data are reported from a range of organic and inorganic magnesium–oxyanion compounds at natural abundance. To constrain the determination of the NMR interaction parameters (δiso,χQ,ηQ) data have been collected at three external magnetic fields (11.7, 14.1 and 18.8 T). Corresponding NMR parameters have also been calculated by using density functional theory (DFT) methods using the GIPAW approach, with good correlations being established between experimental and calculated values of bothχQandδiso. These correlations demonstrate that the25Mg NMR parameters are very sensitive to the structure, with small changes in the local Mg2+environment and the overall hydration state profoundly affecting the observed spectra. The observations suggest that25Mg NMR spectroscopy is a potentially potent probe for addressing some key problems in inorganic materials and of metal centres in biologically relevant molecules.
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