Analysis of the ir absorption profile of hydrargillite in the region of the valent vibrations of hydroxyl groups

Rzhevskii, Alexander; Lysenko, G. N.; Trokhimets, A. I.

doi:10.1007/bf02683853

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“…The full width at half-maximum (FWHM) of this band at ambient temperature was estimated to be less than 20 cm 1 , in good agreement with the data derived from curve fitting the complex IR profile in the (OH) spectral region. 6 This type of 'free' OH group in the lattice of aluminum hydroxide can be considered as a structural analog of a bridged OH group coordinated by two Al atoms on the surface of alumina. Prior knowledge of the FWHM of the spectral band gives a valuable clue for unraveling multi-component spectra of hydroxyl cover on the surface of different alumina phases and thus for obtaining structural information about the surface.…”

Section: Discussionmentioning

confidence: 99%

“…This situation requires special techniques for the analysis of the IR spectra including numerical spectral processing and physical-chemical treatment. 6 Another problem with IR spectra arises from the high dipole moment and, hence, high extinction coefficient of OH groups that requires dilution of aluminum hydroxides with a neutral material such as KBr.…”

Section: Introductionmentioning

confidence: 99%

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UV Raman spectroscopic study of hydrogen bonding in gibbsite and bayerite between 93 and 453 K

Rzhevskii¹,

Ribeiro²

2001

J Raman Spectroscopy

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Raman spectra of bayerite and gibbsite (hydrargillite) were measured at 453, 295 and 93 K and after H-D exchange at 423 K with gaseous D 2 O. Spectra in the O-H stretching vibration region were recorded with the use of ultraviolet laser excitation, which avoided the fluorescence problem typical for these materials. Lowering the temperature led to a spectral resolution improvement with additional bands resolved in the n(OH) spectrum of bayerite. It was established that the positions of the Raman bands are sensitive to the temperature of the sample. A spectral criterion based on different shifts of band positions with temperature was proposed as a method to distinguish between structural OH groups forming H-bonds between hydroxide layers or in the same plane of the layer. It was found that the highest wavenumber band at 3655 cm −1 in the spectrum of bayerite does not participate in H-bonding. A one-to-one correspondence between Raman spectra recorded in the n(OH) and n(OD) regions upon partial H-D exchange with D 2 O is evidence that the multiplicity of spectral bands is caused by different O-H· · ·O distances in the hydroxide lattice rather than by vibrational coupling of H-bonded hydroxyls.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%