选定钒酸盐的拉曼光谱和红外光谱
Raman and infrared spectroscopy of selected vanadates.
作者信息
Frost Ray L, Erickson Kristy L, Weier Matt L, Carmody Onuma
机构信息
Department of Chemistry, Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Qld. 4001, Australia.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2005 Mar;61(5):829-34. doi: 10.1016/j.saa.2004.06.006.
Raman and infrared spectroscopy has been used to study the structure of selected vanadates including pascoite, huemulite, barnesite, hewettite, metahewettite, hummerite. Pascoite, rauvite and huemulite are examples of simple salts involving the decavanadates anion (V10O28)6-. Decavanadate consists of four distinct VO6 units which are reflected in Raman bands at the higher wavenumbers. The Raman spectra of these minerals are characterised by two intense bands at 991 and 965 cm(-1). Four pascoite Raman bands are observed at 991, 965, 958 and 905 cm(-1) and originate from four distinct VO6 sites. The other minerals namely barnesite, hewettite, metahewettite and hummerite have similar layered structures to the decavanadates but are based upon (V5O14)3- units. Barnesite is characterised by a single Raman band at 1010 cm(-1), whilst hummerite has Raman bands at 999 and 962 cm(-1). The absence of four distinct bands indicates the overlap of the vibrational modes from two of the VO6 sites. Metarossite is characterised by a strong band at 953 cm(-1). These bands are assigned to nu1 symmetric stretching modes of (V6O16)2- units and terminal VO3 units. In the infrared spectra of these minerals, bands are observed in the 837-860 cm(-1) and in the 803-833 cm(-1) region. In some of the Raman spectra bands are observed for pascoite, hummerite and metahewettite in similar positions. These bands are assigned to nu3 antisymmetric stretching of (V10O28)6- units or (V5O14)3- units. Because of the complexity of the spectra in the low wavenumber region assignment of bands is difficult. Bands are observed in the 404-458 cm(-1) region and are assigned to the nu2 bending modes of (V10O28)6- units or (V5O14)3- units. Raman bands are observed in the 530-620 cm(-1) region and are assigned to the nu4 bending modes of (V10O28)6- units or (V5O14)3- units. The Raman spectra of the vanadates in the low wavenumber region are complex with multiple overlapping bands which are probably due to VO subunits and MO bonds.
拉曼光谱和红外光谱已被用于研究包括帕斯科矿、韦穆利特矿、巴恩斯矿、休伊特矿、变休伊特矿、悍马矿在内的选定钒酸盐的结构。帕斯科矿、劳维特矿和韦穆利特矿是涉及十钒酸盐阴离子（V10O28）6-的简单盐的例子。十钒酸盐由四个不同的VO6单元组成，这在较高波数的拉曼谱带中有所体现。这些矿物的拉曼光谱的特征是在991和965 cm-1处有两个强谱带。在991、965、958和905 cm-1处观察到四个帕斯科矿拉曼谱带，它们源自四个不同的VO6位点。其他矿物，即巴恩斯矿、休伊特矿、变休伊特矿和悍马矿，具有与十钒酸盐相似的层状结构，但基于（V5O14）3-单元。巴恩斯矿的特征是在1010 cm-1处有一个单一的拉曼谱带，而悍马矿在999和962 cm-1处有拉曼谱带。缺少四个不同的谱带表明来自两个VO6位点的振动模式发生了重叠。变钙钛矿的特征是在953 cm-1处有一个强谱带。这些谱带被归属于（V6O16）2-单元和末端VO3单元的ν1对称拉伸模式。在这些矿物的红外光谱中，在837 - 860 cm-1和803 - 833 cm-1区域观察到谱带。在一些拉曼光谱中，在类似位置观察到了帕斯科矿、悍马矿和变休伊特矿的谱带。这些谱带被归属于（V10O28）6-单元或（V5O14）3-单元的ν3反对称拉伸。由于低波数区域光谱的复杂性，谱带的归属很困难。在404 - 458 cm-1区域观察到谱带，并被归属于（V10O28）6-单元或（V5O14）3-单元的ν2弯曲模式。在530 - 620 cm-1区域观察到拉曼谱带，并被归属于（V10O28）6-单元或（V5O14）3-单元的ν4弯曲模式。钒酸盐在低波数区域的拉曼光谱很复杂，有多个重叠谱带，这可能是由于VO亚基和MO键导致的。
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