Vibrational spectroscopic study of the natural layered double hydroxide manasseite now defined as hydrotalcite-2H-Mg6Al2(OH)16[CO3]⋅4H2O.
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]⋅4H2O. 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 3.00Å. 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(-1) 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.
School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane Queensland 4001, Australia. Electronic address: r.frost@qut.edu.au.
Ray L
RL
Frost
Ricardo
R
Scholz
Andrés
A
López
Frederick L
FL
Theiss
D000536:Aluminum Hydroxide / Q000737:chemistry*; D003460:Crystallization; D006878:Hydroxides / Q000737:chemistry*; D008276:Magnesium Hydroxide / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D014732:Vibration
D006878:Hydroxides; C010467:hydrotalcite; D000536:Aluminum Hydroxide; C031356:hydroxide ion; D008276:Magnesium Hydroxide
Hydrotalcite-2H; Infrared spectroscopy; Manesseite; Pyroaurite-2H; Raman spectroscopy