ProGRES

ARTICLE

Validation of gentamicin congeners using HPLC with electrochemical detection: Comparison with fluorimetric detection

Touridomon Issa Some, Rasmané Semdé, Moustapha Ouedraogo, Karim Amighi, Pierre I. Guissou, Pierre Duez and Jacques Dubois

OPA is often used as an off-line derivatisation agent for fluorimetric detection in gentamicin analysis. As, in general, electrochemical detection is more sensitive than fluorimetric detection, the analysis of gentamicin as its OPA derivatives by high-performance liquid chromatography and electrochemical detection is proposed. The derivatisati(...)

Mots clés non renseignés

ARTICLE

Préparation et caractérisation par Rayons X, par spectrométries UV- visible, IR, Mössbauer et RPE de composés thiolates de la phtalocyanine de fer

M. BAYO-BANGOURA, K. BAYO, G. V. OUEDRAOGO, J. C. MOSSAYAN, G. TERZIAN, D. BENLIAN.

Iron(II) phthalocyanine complexes with SR (R = CH3, CH2C6H5, C6H5, C6H4-pNO2) have been prepared in solid form. These complexes have been characterised by X-Ray diffraction, infrared, electronic, Mössbauer and EPR spectrometries. The X-Ray diffraction of powder spectre show the characteristic lines of Fe-S entity. In infrared spectre, the com(...)

Iron(II) phthalocyanine, thiolates complexes, characterisation

ARTICLE

Spectres IR de monophtalocyanines et de biphtalocyanines de zinc et de cobalt et de leurs dérivés halogénés.

K. BAYO , G. V. OUEDRAOGO, K. BENIHYA, G. TERZIAN, J.C. MOSSOYAN

Nous avons préparé et étudié une série de complexes de la phtalocyanine par spectrométrie d'absorption infra-rouge. Les composés étudiés sont: MPc, biMPc, MPc(X)8, MPc(X)16, (X)12biMPc et biH2Pc avec M = Zn ou Co et X = F, Cl ou CN. Du fait du haut degré de symétrie de la molécule de la phtalocyanine et des analogies de structure entre mo(...)

Phthalocyanine; biphthalocyanine; zinc; cobalt; infrared spectra

ARTICLE

Preparation and analysis by UV-Vis of zinc phthalocyanine complexes

K. Bayo, J.C. Mossoyan , G.V. Ouedraogo

We have prepared and isolated a series of zinc phthalocyanine complexes (ZnPc, ZnPcF8, biZnPc, F12biZnPc). These compounds have been analyzed by electronic spectrometry. The analysis of results demonstrates that the importance of intramolecular interactions in the binuclear species depends on the nature of the peripheral substituents. Keywo(...)

Keywords: Zinc; Phthalocyanine; Binuclear complexes; UV-Vis

ARTICLE

IR and UV-Visible spectra of iron (II) phthalocyanine complexes with phosphine or phosphite

A. Zanguina, M. Bayo - Bangoura, K. Bayo, G.V. Ouédraogo.

We have prepared and studied by vibrational and electronic spectrometry of a series of ferrophthalocyanine complexes with phosphine or phosphite axial ligands [PMe3, P(OMe)3, PPh3, P(OPh)3, PPh(OMe)3 and POH(OEt)2]. With PMe3, P(OMe)3 as ligands, only hexacoordinated complexes are obtained but with PPh3, P(OPh)3 and POH(OEt)2 as ligands, the(...)

Iron(II) phthalocyanine complexes, Phosphine, Phosphite, Vibrational spectrometry of ferrophthalocyanine complexes

ARTICLE

Chromatographic determination of 8-oxo-7,8-dihydro-2′-deoxyguanosine in cellular DNA: A validation study

Pierre Duez, M Helson, Touridomon Issa Some, Jacques Dubois and M Hanocq

Although a series of biomarkers are widely used for the estimation of oxidative damage to biomolecules, validations of the analytical methods have seldom been presented. Formal validation, that is the study of the analytical performances of a method, is however recognized as the best safeguard against the generation and publication of data wit(...)

Mots clés non renseignés

ARTICLE

Growth in Electrodeposition of Metals on n-Si (111)

Krumm, B. Guel, C.Schmitz and G. Staikov,and

Initial stages of electrodeposition of Tl, Cd and Cu on n-Si(111) from sulfate electrolyte solutions are studied using cyclic voltammetry and chronoamperometry. Capacitance measurements in metal ion free solutions were used to determine the flat band potential of n-Si. Results show that the relative position of the metal equilibrium potential(...)

Electrodeposition; Nucleation; Crystal growth; Semiconductors; Flat band potential

ARTICLE

Nucleation and growth in electrodeposition of metals on n-Si(111)

R. Krumm a, B. Guel b, C. Schmitz a, G. Staikov a,*

Initial stages of electrodeposition of Tl, Cd and Cu on n-Si(111) from sulfate electrolyte solutions are studied using cyclic voltammetry and chronoamperometry. Capacitance measurements in metal ion free solutions were used to determine the flat band potential of n-Si. Results show that the relative position of the metal equilibrium potential(...)

Electrodeposition; Nucleation; Crystal growth; Semiconductors; Flat band potential

ARTICLE

Electrodeposition of Pb on n-Si (111)

B. Rashkova, B. Guel, R.T. Pötzschke, G. Staïkov and W. J. Lorenz

Electrodeposition of lead was studied in the system n-Si(111)/Pb2+, ClO4 ÿ, H+ using cyclic voltammetry, chronoamperometry, ex situ optical microscopy and in situ scanning probe microscopy (SPM). Comparative studies were also performed in the system HOPG(0001)/Pb2+, ClO4 ÿ, H+. No underpotential deposition (UPD) of 2D Pb phases could be ob(...)

electrodeposition, semiconductors, phase formation

ARTICLE

Dérivés substitués de la ferrophtalocyanine

Karifa Bayo, Adama Saba, Guy Venance Ouedraogo, Georges Terzian et David Benlian

Résumé La ferrophtalocyanine (PcFe), des ferrophtalocyanines subsituées en périphérie (CH3)8PcFeII, Cl16PcFeII, Br16PcFeII, (COONa)4PcFeII et les complexes derivés comportant des ligands axiaux [pyridine (Py) et pyridines substituées (PyR avec R= Me, -CH2OH, -CHO, Cl, OH, CN) ont été préparés et caractérisés par spectrométries optique et(...)

Mots clés non renseignés

ARTICLE

UV-VISIBLE AND IR SPECTRA OF IRON(II) PHTHALOCYANINE POLYMER COMPLEXES LINKED BY BIS-PYRIDINATO LIGANDS

KARIFA BAY0, GUY VENANCE OUEDRAOGO, GEORGES TERZIAN and DAVID BENLIAN

Abstract:The spectra of iron(II) phthalocyanine polymer complexes (FePcL)n with bispyridinato bridging ligands, where L = 44’-bipyridine (bpy), trans-1,2-(4-pyridyl)ethylene (bpe), 1,2-bis-(4-pyridyl)ethane (bpa), are discussed in comparison with the spectra of FeIIPc and FePcL'2, where L’ = pyridine, 4-cyanopyridine (4CNpy), in reference to(...)

Mots clés non renseignés

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