JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Synthèse et étude physico-chimique du matériau KMn6(As2O7)2(As3O10)

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The structural study of KMn6(As2O7)2(As3O10) compound shows that the material has a three dimensional framework. There are tunnels running along [100] direction where K+ cations are located. Complementary infrared (I.R) and complex impedance (C.I) spectroscopies studies were carried out. Analysis by scanner electronic microscope (S.E.M) was done for the state.

W. Frigui, C. Falah, H. Boughzala, M.F. Zid, A. Driss

structural study, I.R and C.I spectroscopies, S.E.M analysis

Pages 179-188

Synthèse, caractérisation et étude structurale d’un nouveau complexe : ?-octamolybdate(VI) de base organique, (C5H6ClN2)4[Mo8O26]

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The title compound, 2-amino-5-chloropyridin β-octamolybdate(VI), (C5H6ClN2)4[Mo8O26], was produced by hydrothermal reaction of an acidified aqueous solution of NH4Mo7O24.4H2O and 2-amino-5-chloropyridin (hereafter L). This new material has been characterized by M.E.B. and I.R. absorption spectroscopy. Its structure is determined by single crystal X-ray diffraction. It crystallizes in triclinic system with P-1 space group. The parameters are: a = 9.719(3) Å; b = 10.744(5) Å; c = 12.235(7) Å; α = 92.47(4)°; β = 102.14(4)°; γ = 116.57(4)° and Z = 1. The structure is characterized by β-[Mo8O26]4- polyanions that consist of eight MoO6 edge-sharing octahedra. The Mo-Mo distances are in range 3.301(2) - 4.163(2) Å while the four types of Mo-O bond lengths are in range 1.694(5) – 2.444(4) Å. An extensive hydrogen-bonding network N-H…O stabilizes the crystal structure.

M. Driss, F. Ben Amor, M.F. Zid

Hybrid complex, β-octamolybdate, structure

Pages 189-200

Comportement acido-basique du D2EHPA dans un système à deux phases et extraction du cuivre(II)

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The effect of the diluent on the acido-basic behavior of the di(2-ethylhexyl) phosphorique acid (D2EHPA) in a system with two phases was studied by pH-metry. The values of pKA were calculated and follow the ascending order, according to: 1-octanol < methyl isobuthyl ketone < cyclohexane < toluene < dichloromethane ~ chloroform. The variation of the nature of diluent on the extraction of copper(II) in sulphate medium by di(2-ethylhexyl) phosphoric acid made it possible to establish the following order of extraction: 1-octanol > cyclohexane > methyl isobuthyl ketone > dichloromethane > chloroform ~ toluene.

F. Ghebghoub, D. Barkat

Liquid-Liquid Extraction, Copper(II), D2EHPA, Diluents, Constant of acidity

Pages 201-205

Gallocatechin and trans syringin from Limoniastrum guyonianum Bois growing in Tunisia

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Chemical investigation of butanol extract from L. guyonianum Bois roots led to the isolation of Gallocatechin 1 and Trans-Syringin 2. Their structures were established by means of 1 and 2D NMR spectroscopy and ES Mass spectrometry.

S. Medimagh, S. Hammami, K. Faidi, N. Hajji, P.J. Marcedo Abreu, Z. Mighri

L. guyonianum Bois, Plumbaginaceae, roots, Gallocatechin 1, Trans Syringin 2, 1 and 2D NMR

Pages 207-210

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