Titre : |
Conformation moléculaire,structure cristalline, spectroscopie vibrationnelle du dibromomésitylène : Conséquences des interactions intermoléculaires dans les halogénomésitylènes. |
Type de document : |
texte imprimé |
Auteurs : |
Soraya Zeroual, Auteur ; Ali Boudjada, Directeur de thèse ; J. Meinnel, Directeur de thèse |
Editeur : |
constantine [Algérie] : Université Constantine 1 |
Année de publication : |
2013 |
Importance : |
181 f. |
Format : |
30 cm. |
Note générale : |
2 copies imprimées disponibles |
Langues : |
Français (fre) |
Catégories : |
Français - Anglais Physique
|
Tags : |
DBM DFT IR spectroscopy,Raman INS intermolecular interactions trihalogenomesitylenes tunnelling Spectroscopie IR Trihalogénomésitylènes effet tunnel interactions intermoléculaires ثنائي بروموميزيتلين(DBM) نظرية الدالة الوظيفية للكثافة "DFT" المطيافية مفعول النفق التفاعلات بين الجزئيات |
Index. décimale : |
530 Physique |
Résumé : |
In this work we chose to study hydrogenated and deuterated dibromomésitylène DBM,
this compound is very interesting because it has two types of methyl groups in the same molecule: a quasi-free methyl surrounded by two Br atoms and two very hindered methyls.
The DFT calculations of the molecular conformation and vibration modes using the MPWP1W91 functional with the LanL2DZ(d,p)base,are in good agreement with the neutron diffraction and spectroscopie measurements.
IR,Raman and INS spectra of deuterated DBM show a displacement of the frequency of the vibration modes towards weak energies compared to those of the hydrogenated DBM, which is due to the increased moment of inertia.We assigned almost all vibration modes.
The tunnelling was studied by inelastic neutron scattering; the excitation occurs at 390 µeV in the hydrogenated DBM and at 67±2 µeV for the perdeuterated DBM. These values correspond to the same hindering potential.
Second interest of this study is too complement the work done by our team on trihalogenomesitylenes (TCM,TBM and TIM); we calculated the intermolecular interactions in these crystals. |
Diplôme : |
Doctorat en sciences |
En ligne : |
../theses/physique/ZER6476.pdf |
Format de la ressource électronique : |
pdf |
Permalink : |
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