Infrared and laser Raman studies of bis(l-threoninium) sulphate monohydrate

Jinnah, M. Mohamed Ali; Umadevi, M.; Ravikumar, B.; Ramakrishnan, V.

doi:10.1016/j.saa.2004.02.010

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…In bis(L-threoninium) sulfate monohydrate, this vibration is identified at 1043 cm 1 . 19 In the present crystal, the strong band at 1093 cm 1 in the IR spectrum is assigned to this mode and it is observed as weak band at 1089 cm 1 in the Raman spectrum. The weak band at 1502 cm 1 in the IR spectrum is attributed to the antisymmetric stretching wavenumber of CN.…”

Section: Vibrations Of B-alanine Moleculessupporting

confidence: 47%

Vibrational spectral studies of (β‐alanine) β‐alaninium nitrate

Jinnah

Umadevi

Ramakrishnan

2004

J Raman Spectroscopy

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Laser Raman and infrared spectra of (b-alanine) b-alaninium nitrate were recorded and analyzed at room temperature. The proposed assignment of normal modes is based on group theoretical analysis. The hydrogen atom is shared by two amino acids, leading to switching of roles of the cation and zwitterion. The two alanine groups share one proton and become monoprotonated. The presence of an ionized carboxylic group and carbonyl was identified. The extensive hydrogen bonding in the crystal is responsible for the changes in the position and intensity of several bands. The nitrate anion fundamentals, however, continue to be degenerate.

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Section: Vibrations Of B-alanine Moleculessupporting

confidence: 47%

Vibrational spectral studies of (β‐alanine) β‐alaninium nitrate

Jinnah

Umadevi

Ramakrishnan

2004

J Raman Spectroscopy

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“…The peak at 579 cm -1 is assigned to the bending vibration of this group [13]. The O-H inplane bending vibration is at 1234 cm -1 [15,16]. The O-H out-of-plane bending vibrations are at 833 and 909 cm -1 [15,16,17,18].…”

Section: Resultsmentioning

confidence: 95%

Adsorption of Dodecylbenzenesulfonic Acid on the Alumina Particles in the Preparation of Alumina Foam

Hajdúchová¹

2018

Ceramics - Silikaty

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Partially hydrophobized particles of α-Al 2 O 3 were used to prepare the alumina foams. Dodecylbenzenesulfonic acid (DBSA) was applied to the hydrophobized surface of alumina particles. The infrared spectroscopy provided the evidence of the interaction (adsorption) of DBSA on the alumina surface. The quantity of DBSA adsorbed on the alumina particles was determined using Lambert-Beer law by measuring UV-VIS spectra. The mechanisms of DBSA adsorption on the surface of alumina particles may be attributed to (1) electrostatic interactions or (2) specific chemical reactions between the surfactant and the surface hydroxyl groups. Adsorption of DBSA on the alumina particles is strongly influenced by the pH of suspensions. The quantity of DBSA is not sufficient to hydrophobize alumina particles at pH up to about pH 9.5, as the electrostatic repulsion forces between the sulfonic group of DBSA and the alumina surface prevailed and the DBSA acts only as a surfactant. The foams were sintered at 1400, 1450, 1500, 1550 and 1600°C. The optimal sintering temperature was found to be 1550°C. The maximal compressive strength of the alumina foams was ~300 kPa while its porosity was relatively high (96.7 %).

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“…29 The very strong band at 1107 cm 1 and a very weak band at 1006 cm 1 in the IR spectrum are assigned to the C-N symmetric stretching vibrations. The high-intensity broad band at 1508 cm 1 in the IR spectrum is attributed to the asymmetric stretching mode of the C-N bond 12 . This band appears broad owing to the overlapping of overtone of the CH 2 rocking mode of vibration, the fundamental of which is a strong band at 752 cm 1 .…”

Section: C-n and C-c-n Group Vibrationsmentioning

confidence: 99%

Infrared and laser Raman spectra of bis(DL-methioninium) sulfate

Ramaswamy¹,

Rajaram²,

Ramakrishnan³

2005

J. Raman Spectrosc.

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The infrared and laser-excited Raman spectra of bis(DL-methioninium) sulfate crystal were recorded and analyzed at room temperature. The vibrational assignments of the observed wavenumbers were made based on group theoretical analysis. The presence of C O group is confirmed. Factor group analysis was carried out and the number of normal vibrational modes was calculated. The shifting of several stretching and bending wavenumbers suggests that the extensive intermolecular hydrogen bonding causes both linear and angular distortions of several groups. The splitting of the threefold degenerate stretching and bending modes of the sulfate group confirms the distortion of its T d symmetry due to hydrogen bonding.

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Infrared and laser Raman studies of bis(l-threoninium) sulphate monohydrate

Cited by 13 publications

References 9 publications

Vibrational spectral studies of (β‐alanine) β‐alaninium nitrate

Vibrational spectral studies of (β‐alanine) β‐alaninium nitrate

Adsorption of Dodecylbenzenesulfonic Acid on the Alumina Particles in the Preparation of Alumina Foam

Infrared and laser Raman spectra of bis(DL-methioninium) sulfate

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