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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Raman spectroscopy of synthetic and natural iowaite
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Raman spectroscopy of synthetic and natural iowaite

机译：合成和天然碘的拉曼光谱

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The chemistry of a magnesium based hydrotalcite known as iowaite Mg6Fe2Cl2(OH)(16).4H(2)O has been studied using Raman spectroscopy. Iowaite has chloride as the counter anion in the interlayer. The formula of synthetic iowaite was found to be Mg5.78Fe2.09(Cl,(CO3)(0.5))(OH)(16).4H(2)O. Oxidation of natural iowaite results in the formation of Mg4FeO(Cl,CO3) (OH)(8).4H(2)O. X-ray diffraction (XRD) shows that the iowaite is a layered structure with a d(001) spacing of 8.0 Angstrom. For synthetic iowaite three Raman bands at 1376, 1194 and 1084 cm(-1) are attributed to CO3 stretching vibrations. These bands are not observed for the natural iowaite but are observed when the natural iowaite is exposed to air. The Raman spectrum of natural iowaite shows three bands at 708, 690 and 620 cm(-1) and upon exposure to air, two broad bands are found at 710 and 648 cm(-1). The Raman spectrum of synthetic iowaite has a very broad band at 712 cm(-1). The Raman spectrum of natural iowaite shows an intense band at 527 cm(-1). The air oxidized iowaite shows two bands at 547 and 484 cm(-1) attributed to the (CO3)(2-) nu(2) bending mode. Raman spectroscopy has proven most useful for the study of the chemistry of iowaite and chemical changes induced in natural iowaite upon exposure to air. (C) 2004 Elsevier B.V. All rights reserved.
机译：已经使用拉曼光谱法研究了称为iowaite Mg6Fe2Cl2（OH）（16）.4H（2）O的镁基水滑石的化学性质。爱奥华石在层间具有氯离子作为抗衡阴离子。发现合成碘的分子式为Mg5.78Fe2.09（Cl，（CO3）（0.5））（OH）（16）.4H（2）O。天然碘的氧化导致形成Mg4FeO（Cl，CO3）（OH）（8）.4H（2）O。 X射线衍射（XRD）表明，碘伏是层状结构，d（001）间距为8.0埃。对于合成碘，三个拉曼带分别在1376、1194和1084 cm（-1）处归因于CO3拉伸振动。对于天然爱荷华州，没有观察到这些谱带，但是当天然爱荷华州暴露于空气时，可以观察到这些谱带。天然碘的拉曼光谱显示在708、690和620 cm（-1）处的三个波段，暴露于空气后，在710和648 cm（-1）处发现了两个宽带。合成碘的拉曼光谱在712 cm（-1）处有很宽的谱带。天然碘的拉曼光谱在527 cm（-1）处显示出很强的谱带。空气氧化的iowaite在547和484 cm（-1）处显示两个带，归因于（CO3）（2-）nu（2）弯曲模式。拉曼光谱已被证明对研究碘的化学和暴露于空气中天然碘引起的化学变化最有用。 （C）2004 Elsevier B.V.保留所有权利。

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