| Titre : |
Synthèse, étude structurale et propriétés physicochimiques de nouveaux complexes de métaux de transition mono et polynucléaires |
| Type de document : |
texte imprimé |
| Auteurs : |
Mehdi Boutebdja, Auteur ; Adel Beghidja, Directeur de thèse |
| Editeur : |
جامعة الإخوة منتوري قسنطينة |
| Année de publication : |
2018 |
| Importance : |
193 f. |
| Format : |
30 cm. |
| Note générale : |
2 copies imprimées disponibles
|
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Chimie
|
| Tags : |
Sel noir de Roussin complexes polynucléaires structure double cubane 2,2’-bipyridine 1,10-
Phenanthroline DRX ATG/ATD magnétisme moléculaire voltammètrie cyclique Roussin’s Black salt polynuclear complexes double cubane structure XRD molecular magnetism cyclic voltammetry الملح الأسود لروسین معقد متعددة النواة ھیكل مكعب مزدوج -'2،2بیبیریدین -1 10فیننترولینو
انعكاس الأشعة السینیة ATG/ATDالمغنطیسیة الجزیئیة الفولطامتریة الحلقیة |
| Index. décimale : |
540 Chimie et sciences connexes |
| Résumé : |
This thesis focuses on the synthesis and the structural characterization by x-ray diffraction on powder and monocrystal and by different spectroscopic methods, as well as by thermal analyzes and the study of the magnetic and electrochemical behavior of several coordination complexes of metals of transition.
The use of carboxylate ligands such as thiomalic acid combined with poly-pyridine co-ligands such as 1,10'-phenanthroline and/or 2,2'-bipyridine, led to two families of polynuclear complexes: the first is composed of two heptanuclear clusters based on mixed valence cobalt (CoII/CoIII) with a double cubane structure, whereas the same reaction with iron led us to two other tetranuclear clusters of Roussinate type structure. The cyclic voltammetric
measurements performed on the heptanuclear clusters show two reversible oxidationreduction waves between 0 and -3V attributed to the oxidation and the reduction of the CoII and CoIII ions, on the other hand the electrochemical study of the Roussin’s black salts revealed that the reduction of the anion [Fe4(S)3(NO)7]- occurs in a series of three electron transfer steps.
A third set of four new copper(II) and nickel(II) complexes were synthesized using the polypyridine ligands. The first complex is in the form of a one-dimensional coordination polymer based on copper (II) bridged by acetate and azido mixed ligands, while the other three compounds are in the form of mononuclear complexes based on copper (II) and nickel (II).
The magnetic measurement carried out on the one-dimensional polymer, revealed that the magnetic interactions dominant at high temperature in the chains are of ferromagnetic nature with the observation of a 3D antiferromagnetic order between the chains with TN = 2.3K, where the paths of exchanges between the magnetic centers is done via: the azido bridges with the conformation End-On and the acetato bridges with the syn-syn conformation.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/chimie/BOU7299.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=10914 |
Synthèse, étude structurale et propriétés physicochimiques de nouveaux complexes de métaux de transition mono et polynucléaires [texte imprimé] / Mehdi Boutebdja, Auteur ; Adel Beghidja, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 193 f. ; 30 cm. 2 copies imprimées disponibles
Langues : Français ( fre)
| Catégories : |
Français - Anglais
Chimie
|
| Tags : |
Sel noir de Roussin complexes polynucléaires structure double cubane 2,2’-bipyridine 1,10-
Phenanthroline DRX ATG/ATD magnétisme moléculaire voltammètrie cyclique Roussin’s Black salt polynuclear complexes double cubane structure XRD molecular magnetism cyclic voltammetry الملح الأسود لروسین معقد متعددة النواة ھیكل مكعب مزدوج -'2،2بیبیریدین -1 10فیننترولینو
انعكاس الأشعة السینیة ATG/ATDالمغنطیسیة الجزیئیة الفولطامتریة الحلقیة |
| Index. décimale : |
540 Chimie et sciences connexes |
| Résumé : |
This thesis focuses on the synthesis and the structural characterization by x-ray diffraction on powder and monocrystal and by different spectroscopic methods, as well as by thermal analyzes and the study of the magnetic and electrochemical behavior of several coordination complexes of metals of transition.
The use of carboxylate ligands such as thiomalic acid combined with poly-pyridine co-ligands such as 1,10'-phenanthroline and/or 2,2'-bipyridine, led to two families of polynuclear complexes: the first is composed of two heptanuclear clusters based on mixed valence cobalt (CoII/CoIII) with a double cubane structure, whereas the same reaction with iron led us to two other tetranuclear clusters of Roussinate type structure. The cyclic voltammetric
measurements performed on the heptanuclear clusters show two reversible oxidationreduction waves between 0 and -3V attributed to the oxidation and the reduction of the CoII and CoIII ions, on the other hand the electrochemical study of the Roussin’s black salts revealed that the reduction of the anion [Fe4(S)3(NO)7]- occurs in a series of three electron transfer steps.
A third set of four new copper(II) and nickel(II) complexes were synthesized using the polypyridine ligands. The first complex is in the form of a one-dimensional coordination polymer based on copper (II) bridged by acetate and azido mixed ligands, while the other three compounds are in the form of mononuclear complexes based on copper (II) and nickel (II).
The magnetic measurement carried out on the one-dimensional polymer, revealed that the magnetic interactions dominant at high temperature in the chains are of ferromagnetic nature with the observation of a 3D antiferromagnetic order between the chains with TN = 2.3K, where the paths of exchanges between the magnetic centers is done via: the azido bridges with the conformation End-On and the acetato bridges with the syn-syn conformation.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/chimie/BOU7299.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=10914 |
|
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