水菱镁矿 Mg(OH)(HCO3)·2H2O 的红外和红外发射光谱——对水菱镁矿分子式的启示。
Infrared and infrared emission spectroscopy of nesquehonite Mg(OH)(HCO3)·2H2O-implications for the formula of nesquehonite.
机构信息
Faculty of Science and Technology, Queensland University of Technology, Brisbane, Queensland, Australia.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Apr;78(4):1255-60. doi: 10.1016/j.saa.2010.12.059. Epub 2010 Dec 22.
The mineral nesquehonite Mg(OH)(HCO(3))·2H(2)O has been analysed by a combination of infrared (IR) and infrared emission spectroscopy (IES). Both techniques show OH vibrations, both stretching and deformation modes. IES proves the OH units are stable up to 450°C. The strong IR band at 934 cm(-1) is evidence for MgOH deformation modes supporting the concept of HCO(3)(-) units in the molecular structure. Infrared bands at 1027, 1052 and 1098 cm(-1) are attributed to the symmetric stretching modes of HCO(3)(-) and CO(3)(2-) units. Infrared bands at 1419, 1439, 1511, and 1528 cm(-1) are assigned to the antisymmetric stretching modes of CO(3)(2-) and HCO(3)(-) units. IES supported by thermoanalytical results defines the thermal stability of nesquehonite. IES defines the changes in the molecular structure of nesquehonite with temperature. The results of IR and IES supports the concept that the formula of nesquehonite is better defined as Mg(OH)(HCO(3))·2H(2)O.
矿物纤蛇纹石 Mg(OH)(HCO(3))·2H(2)O 已经通过红外 (IR) 和红外发射光谱 (IES) 的组合进行了分析。两种技术都显示出 OH 振动，既有伸缩模式也有变形模式。IES 证明 OH 单元在 450°C 以下是稳定的。934 cm(-1)处的强 IR 带是 MgOH 变形模式的证据，支持 HCO(3)(-)单元在分子结构中的概念。1027、1052 和 1098 cm(-1)处的红外带归因于 HCO(3)(-)和 CO(3)(2-)单元的对称伸缩模式。1419、1439、1511 和 1528 cm(-1)处的红外带被分配给 CO(3)(2-)和 HCO(3)(-)单元的反对称伸缩模式。IES 结合热分析结果定义了纤蛇纹石的热稳定性。IES 定义了纤蛇纹石的分子结构随温度的变化。IR 和 IES 的结果支持这样的概念，即纤蛇纹石的化学式更好地定义为 Mg(OH)(HCO(3))·2H(2)O。
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