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16 results on '"Brouzi, K."'

4. Vibrational Study of Manganese Ammonium Dihydrogendiphosphate Hydrated Mn0.5NH4H2P2O7 • H2O

Author

Brouzi K., Ennaciri A., Capitelli F., Valentini V., Matteri G., and Harcharras M.

Subjects
Infrared spectra, Raman spectra
Abstract

Raman and infrared spectra of manganese ammonium dihydrogendiphosphate hydrated Mn0.5NH4H2P2O7·H2O have been collected and interpreted using factor group analysis. Non-coincidence of the Raman and infrared spectra bands confirms a centrosymmetric structure for Mn0.5NH4H2P2O7·H2O, as previously investigated by X-ray structural study, as well as the joint appearance of ?as POP and ?s POP point to a bent POP configuration.

Published
2005

5. Structure and vibrational spectra of a new trihydrate diphosphate, MnNH4NaP2O7.3H2O

Author

Brouzi K. 1, Ennaciri A. 1, Harcharras M. 1, and Capitelli F. 2

Subjects
trihydrate, crystal structure, diphosphate, x-ray diffraction, vibrational spectra
Abstract

The new trihydrate diphosphate, MnNH(4)NaP(2)O(7)(.)3H(2)O, were synthesized and investigated by X-ray diffraction and vibrational spectroscopy. Single crystal structure has been obtained using 1361 reflections with a final R value of 0.0564. This salt crystallizes in the monoclinic system, space group Cc, with Z = 4 and the following unit-cell parameters: a = 10.1125(12), b = 16.4370(3), c = 5.5987(7) Angstrom, beta = 104.314degrees(9), V = 901.7 Angstrom(3). The atomic arrangement is a three-dimensional framework built from P2O74- diphosphate anions linked by MnO6, NaO6 and NH4O6 octahedra. The P2O74- anion shows bent eclipsed configuration with bridge angle P-O-P of 125.9(4)degrees. The infrared and Raman spectra of this salt have been recorded and interpreted using factor group analysis. Most of the bands are observed in both infrared and Raman spectra, which confirms a non-centrosymmetric space group. The apparence of upsilon(as) POP and upsilon(s) POP in infrared and Raman spectra point to a bent POP bridge in MnNH(4)NaP(2)O(7)(.)3H(2)O.

Published
2004
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13. Caractérisation physicochimique et microbiologique des margines d'une huilerie moderne située dans la ville de Meknès, Maroc.

Author

Allalat, F., Slaoui, M., and Brouzi, K.

Subjects
OIL mills, MILLING machinery, OLIVE oil, WATER purification, SEWAGE
Abstract

Copyright of Eau, l'Industrie, les Nuisances is the property of Editions Johanet and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2020

14. Vibrational Study of Manganese Ammonium Dihydrogendiphosphate Hydrated Mn0.5NH4H2P2O7H2O.

Author

Brouzi, K., Ennaciri, A., Capitelli, F., Valentini, V., Mattei, G., and Harcharras, M.

Subjects
*INFRARED spectra, *RAMAN effect, *MANGANESE, *AMMONIUM, *HYDROGEN, *PYROPHOSPHATES
Abstract

Raman and infrared spectra of manganese ammonium dihydrogendiphosphate hydrated Mn0.5NH4H2P2O7.H2O have been collected and interpreted using factor group analysis. Non-coincidence of the Raman and infrared spectra bands confirms a centrosymmetric structure for Mn0.5NH4H2P2O7.H2O as previously investigated by X-ray structural study, as well as the joint appearance of vas POP and vs POP point to a bent POP configuration. [ABSTRACT FROM AUTHOR]

Published
2005
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16. Synthesis, X-ray crystal structure and vibrational spectroscopy of the acidic pyrophosphate KMg0.5H2P2O7·H2O

Author

Harcharras, M., Capitelli, F., Ennaciri, A., Brouzi, K., Moliterni, A.G.G., Mattei, G., and Bertolasi, V.

Subjects
*POTASSIUM compounds, *INFRARED spectroscopy, *MOLECULAR structure, *X-ray diffraction
Abstract

The hydrated potassium hemimagnesium dihydrogen pyrophosphate KMg0.5H2P2O7·H2O was synthesized. It crystallizes in the triclinic system, space group P1¯ (n. 2), Z=2, with the following unit-cell parameters: a=6.8565(2) A˚, b=7.3621(3) A˚, c=7.6202(3) A˚, α=81.044(2)°, β=72.248(2)°, γ=83.314(3)°, V=360.90(2) A˚3. The structure was obtained by single-crystal X-ray diffractometry, and a full-matrix least-squares refinement based on F2 gave a final R index of =0.0368 (wR=0.0975), utilizing 1446 observed reflections with I>2σ(I). The crystal packing consists in a three-dimensional network made by layers parallel to ab plane of PO4 double tetrahedra and MgO6 octahedra, linked by hydrogen bonds, while K atoms form complex coordination within cavities between tetrahedra and octahedra. The dihydro-pyrophosphate anion (H2P2O7)2− shows bent eclipsed conformation and the Mg2+ ion lies on inversion center. No coincidences observed between most of infrared and Raman spectral bands confirmed the centrosymmetric structure of the title compound; the vibrational spectra point to a bent POP bridge angle. [Copyright &y& Elsevier]

Published
2003
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