X-ray absorption spectroscopic studies on model compounds for biological iodine and bromine
X-ray absorption spectroscopic studies on model compounds for biological iodine and bromine
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DOI：
10.1107/s0909049504027815
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发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
Meyer-Klaucke, W
中科院分区：
文献类型：
--
作者：
Feiters, MC;Küpper, FC;Meyer-Klaucke, W
测量了许多具有生物相关性的有机碘和溴化合物以及一系列具有不同氧化态的碘化合物的X射线吸收光谱。碘 K 边光谱 (XANES) 相对无特征，但边缘位置对形式化合价（除其他因素外）敏感，边缘形状对结合 O 原子的数量敏感。有机卤素化合物（碘和溴）的 EXAFS 光谱可用于区分脂肪族和芳香族化合物。卤素到 C 原子第一个壳层的距离（芳香族化合物较短）和傅立叶变换中壳层的模式都存在差异。预计这一结果将与生物系统这些边缘的研究相关。
X-ray absorption spectra of a number of organic iodine and bromine compounds of biological relevance, as well as of a series of iodine compounds with different oxidation states, have been measured. The iodine K-edge spectra (XANES) are found to be relatively featureless but the position of the edge is found to be sensitive to formal valence ( among other factors), and the edge shape to the number of bound O atoms. EXAFS spectra of organohalogen compounds ( both iodine and bromine) can be used to discriminate between aliphatic and aromatic compounds. There are differences both in the distances from the halogens to the first shell of C atoms, which are shorter for aromatic compounds, and in the patterns of shells in the Fourier transforms. This result is expected to be relevant to studies at these edges in biological systems.