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| Titel: |
Novel Mixed-Valence μ-Oxo-Bridged Trinuclear Manganese Complexes [Mn3O(O2CR)6L3] (R=4-Cl-C6H4OCH2, 3-Cl-C6H5, BrCH2, L=3-Methylpyridine or Water): Structures and Magnetic Properties |
| Auteur: |
An, Jin Wang, Shixi Yan, Bing Chen, Zhida |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 55 (2002) nr. 10 pagina's 1223-1232 |
| Jaar: |
2002 |
| Inhoud: |
Preparation of three new mixed-valence oxo-centered trinuclear manganese complexes [Mn3O(O2CR)6L3] (R=4-Cl-C6H4OCH2, 1, 3-Cl-C6H5, 2, BrCH2, 3; L=3-methylpyridine or water), by reaction of N-n-Bu4MnO4 with appropriate reagents in ethanol and 3-methelpyridine is reported. The crystal structure of 1 has shown to have an oxo-centered Mn3O unit with peripheral ligands provided by bridging carboxylate and terminal 3-methylpyridine groups, and with an approximate 3-fold symmetry axis for the whole cluster. Variable temperature magnetic susceptibilities of the complexes in the range 1.5-300 K have been measured and are interpreted in terms of the Kambe vector-coupling method and Van Vleck equation; J (cm-1), J' (cm-1), g, and R parameters obtained are -8.2, -10.9, 2.04, 2.15 x 10-3 (1); -7.3, -11.1, 2.20, 3.32 x 10-3 (2); -2.1, -4.1, 1.97, 2.34 x 10-3 (3). There is weak antiferromagnetic exchange between manganese ions. Effects of bridging and terminal ligands on the J, J' values and spin ground state are discussed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 31 van 86 gevonden artikelen
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