Vibrational spectroscopic study of the natural layered double hydroxide manasseite now defined as hydrotalcite-2H - Mg₆Al₂(OH)₁₆[CO₃]鈰?H₂O

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• 作者：Ray L. Frost ; Ricardo Scholz ; Andr茅s L贸pez ; Frederick L. Theiss
• 关键词：Manesseite ; Hydrotalcite-2H ; Pyroaurite-2H ; Raman spectroscopy ; Infrared spectroscopy
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：24 January, 2014
• 年：2014
• 卷：118
• 期：Complete
• 页码：187-191
• 全文大小：940 K

文摘

Raman and thermo-Raman spectroscopy have been applied to study the mineral formerly known as manasseite now simply renamed as hydrotalcite-2H Mg₆Al₂(OH)₁₆[CO₃]鈰?H₂O. The mineral is a member of the homonymous hydrotalcite supergroup. Hydrogen bond distances calculated using a Libowitzky-type empirical function varied between 2.61 and 3.00 脜. Stronger hydrogen bonds were formed by water units as compared to the hydroxyl units. Raman spectroscopy enabled the identification of bands attributed to the hydroxyl units. Two Raman bands at 1059 and 1064 cm^鈭? are assigned to symmetric stretching modes of the carbonate anion. Thermal treatment shifts these bands to higher wavenumbers indicating a change in the strength of the carbonate bonding.