JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Synthesis of Δ2-pyrazolines precursors of pyrazolenines with different electrotractor substituents in C4 and C5. Photochemical evolution of formed dimethyl-3,3-pyrazolenines

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The 1.3-dipolar cycloaddition of diazo-2-propane (DAP) to diactivated dissymetric ethylene has enabled us to synthesize in good yield the homologous AH-pyrazolines. The oxidation of 3.3-dimethyl- Δ2-pyrazo-lines 6 and 7 with MnO, provides a new way of functionaling 3,3-dimethyl-pyrazolenines with electron attracting groups as substituents on C4 and C5. Similarly, the direct photolysis of functionalized pyrazolenines 8 and 9 also gives the gemdimethylcyclopropenes 12 functionalized.

A.K. Khemiss, M. Franck-Neumann

Pages 3-8

IR spectroscopic study of interaction of CO, NO and NO + CO with Fe2O3/Al2O3 catalyst: Metal oxide-support interactions

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Nous avons utilisé la spectroscopie I.R. pour étudier l'adsorption de CO et de NO sur I'oxyde de fer Fe2O3 supporté par l'alumine (3 % de fer en masse). Les échantillons étudiés sont oxydés ou réduits à 723 K. Nous avons pu constater que les différents sites d'adsorption de CO ou de NO se forment fors du traitement préalable des précurseurs Fe2O3/Al2O3 dans une atmosphère oxydante on réductrice : (I) les sites Fe2+ qui sont en forte interaction avec le support, (II) les ions Fe3+ partiellement réduits (Fe(3-δ)+) et (III) les ions Fe2+ localisés dans les sites octaédriques de Fe3O4 engendré !ors de la réduction de Fe2O3.

H. Batis

Pages 19-27

Cu2S-Cd1-YZnYS solar cells: Influence of zinc sulfide composition on photovoltaic efficiency

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We have realized Cu,S-Cd1-YZnYS photocells (0 ≤ Y ≤ 0,35), starting from CdS, Al2O3-CD1-YZnYS prepared from "low pressure" spray pyrolysis on heated glass substrates. The Cu2S film is formed by ion exchange reaction from the alloy films (CdZn)S in aqueous solution of Cu(1) at 90°C. The zinc concentration of the layers Cd1-YZnYS is always higher than the solution one. The conversion efficiency reaches 4.4 %, for a concentration of ZnS equal to 0.12.

M. Dachraoui

Pages 29-33

Corrosion inhibiting properties of disodic monoalkyl phosphates and phosphonates

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The study by cathodic polarisation curves of disodic monoalkyl phosphates and phosphonates as organic inhibitors of the corrosion of a XC 38 carbon steel using a rotating disc-electrode in contact with a 3 % NaCI solution has been carried out. This products appears to be an efficient inhibitor.

Y. Derbali, M. Dupart, A. Lattes, A. Savignac

Pages 35-41

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