JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Review: Solar energy conversion and photoelectrochemical cells

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In recent years, many types of systems which enable the conversion of solar energy into electrical or chemical energy have been proposed. This work is a review of the electrochemical cells proposed in literature. For comparison, some results of photovoltaic cells are cited.

M. Dhahbi (ex. Hamdi)

Pages 63-74

Addition 1,3-dipolaire du diazo - 2 propane sur des acétyléniques monoactivés dissymétriques et évolution photochimique des dimétyl-3,3 pyrazolénines formées

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The synthesis of pyrazolenines derived from dissymetric monoactivated acetylenics of which the second substituant is n-alkyl has been realized stoechiometrically. This result was obtained by addition 1,3-dipolar of diazo-2 propane to the starting acetylenics. In the same way, all the photolysies of the mono-activated pyrazolenines have enabled us to get exclusively the expected mono-activated gemdimethylcyclopropene.

A. Khemiss, M. Franck-Neumann

Pages 3-12

Aspects stéréochimiques du réarrangement de Cope de monoesters d'hexadiènes-1,5

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The Z/E olefinic bond ration of enol ethers obtained by Oxy-Cope rearrangement of hetero-substituted 1,5-hexadienes reveals that the reaction is not governed by the free energy change for the conversion of a substituent from the equatorial to the axial position in the chair transition state but rather by the relative thermodynamic stability of the isomers Z and E.

R. Abdelhedi, M.L. Bouguerra, J. C. Pommelet, J. Chuche

Pages 13-17

Influence de la composition du mélange réactionnel C3H6-O2 sur le comportement des catalyseurs Sn-Sb-O -

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The oxidation of propylene over the Tin-Antimony oxide catalysts has been proved to be sensitive to the composition of the reactional mixture. This composition affects the stability of the catalyser during the reaction and the fonctionning of its busy centres.

B. Bejar, N. Zenaidi, A. Ghorbel

Pages 25-32

The Raman spectra of di and trimethylammonium hexachlorostannate crystals

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The low frequency Raman Spectra (0 - 350 cm-1) of [(CH3)2 NH2]2 Sn Cl6 (2MHS) and [(CH3)3 NH]2 Sn Cl6 (3MHS) were recorded on single crystals at room temperature. The Spectra have been assigned on the basis of group theory analysis of vibrations and in view of the previously reported structural data of these two hexachlorostannate compouds. Their corresponding structures are derived from the Fm3m antifluorite structure.

M.H. Ben Gozlen, Y. Mlik, A. Daoud

Pages 33-37

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