Thermal decomposition of mixed-valent diruthenium pentakis(alkanoates) enhanced by their liquid crystalline state
The thermal decomposition of mixed-valent diruthenium pentakis(alkanoates) of general formula Ru2 (II,III)(O2C(CH2)n-2CH3)5 (for n = 3, 4, 5, 6, 8, 10, 12, 16), studied by a combination of several complementary physicochemical techniques, has been found to take place in two differentiated steps. The...
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| Otros Autores: | , |
| Formato: | Acta de conferencia Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier Science Publishers B.V.
1999
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | The thermal decomposition of mixed-valent diruthenium pentakis(alkanoates) of general formula Ru2 (II,III)(O2C(CH2)n-2CH3)5 (for n = 3, 4, 5, 6, 8, 10, 12, 16), studied by a combination of several complementary physicochemical techniques, has been found to take place in two differentiated steps. The first one gives the divalent analogues Ru2 (II,II)(O2C(CH2)n-2CH3)4 as the main product, in a one-electron reduction of the bimetallic core likely provided by oxidative decarboxylation of the axial anion. The second one involves the reduction of the binuclear core to metallic ruthenium, and the oxidation of the equatorial carboxylates. The first step is very much influenced by the aggregation state of the system, the occurrence of a liquid-crystalline phase in compounds with n>6 facilitates the thermolysis: decomposition temperatures fall from ≈300 °C for compounds with n = 3 to ≈175 °C for compounds with n = 10-16. |
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| Bibliografía: | Cukiernik, F.D., Ibn-Elhaj, M., Maldivi, P., Giroud-Godquin, A.M., Guillon, D., Marchon, J.C., Skoulios, A., (1991) Liq. Crystals, 9, p. 903 Bonnet, L., Cukiernik, F.D., Maldivi, P., Giroud-Godquin, A.M., Marchon, J.C., Ibn-Elhaj, M., Guillon, D., Skoulios, A., (1994) Chem. Mater., 6, p. 31 Cukiernik, F.D., Ibn-Elhaj, M., Chaia, Z.D., Marchon, J.C., Giroud-Godquin, A.M., Guillon, D., Skoulios, A., Maldivi, P., (1998) Chem. Mater., 10, p. 83 Cukiernik, F.D., Marchon, J.C., Luneau, D., Maldivi, P., (1998) Inorg. Chem., 37, p. 3698 Rusjan, M.C., Sileo, E.E., Cukiernik, F.D., to be submitted; Sileo, E.E., Morando, P.J., Dellavedova, C.O., Blesa, M.A., (1989) Termochim. Acta, 138, p. 233 Carr, N.J., Galwey, A.K., (1988) J. Chem. Soc. Faraday Trans., 1, p. 84 Sileo, E.E., Morando, P.J., Blesa, M.A., (1989) Termochim. Acta, 152, p. 299 Ibn-Elhaj, M., Guillon, D., Skoulios, A., Giroud-Godquin, A.M., Marchon, J.C., (1992) J. Phys. II Paris, 2, p. 2197 Segrouchni, R., Skoulios, A., (1995) J. Phys. II Paris, 5, p. 1385 Abied, H., Guillon, D., Skoulios, A., Weber, P., Giroud-Godquin, A.M., Marchon, J.C., (1987) Liq. Crystals, 2, p. 269 Maldivi, P., (1989), PhD thesis, University of Grenoble; Cukiernik, F.D., (1993), PhD thesis, University of Grenoble; Poizat, O., Cukiernik, F.D., work in progress |
| ISSN: | 01672738 |
| DOI: | 10.1016/S0167-2738(99)00100-9 |