Synthesis, Crystal Structure, and Magnetic Studies of Oxo-Centered Trinuclear Chromium(III) Complexes: [Cr3(μ3-O)(μ2-PhCOO)6(H2O)3]NO3· 4H2O·2CH3OH, a Case of Spin-Frustrated System, and [Cr3(μ3-O)- (μ2-PhCOO)2(μ2-OCH2CH3)2(bpy)2(NCS )3], a New Type of [Cr3O] Core
| Autor: | Albert Figuerola, Joan Ribas, Irene Brüdgam, Carmen Diaz, Hans Hartl, and Miguel Maestro, Vassilis Tangoulis |
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| Rok vydání: | 2007 |
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| Zdroj: | Inorganic Chemistry. 46:11017-11024 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic700606e |
| Popis: | The synthesis, crystal structure, and magnetic properties of two trinuclear oxo-centered carboxylate complexes are reported and discussed: [Cr3(μ3-O)(μ2-PhCOO)6(H2O)3]NO3·4H2O·2CH3OH (1) and [Cr3(μ3-O)(μ2-PhCOO)2(μ2-OCH2CH3)2(bpy)2(NCS)3] (2). For both complexes the crystal system is monoclinic, with space group C2/c for 1 and P1/n for 2. The structure of complex 1 consists of discrete trinuclear cations, associated NO3- anions, and lattice methanol and water molecules. The structure of complex 2 is built only by neutral discrete trinuclear entities. The most important feature of 2 is the unusual skeleton of the [Cr3O] core due to the lack of peripheral bridging ligands along one side of the triangular core, which is unique among the structurally characterized (μ3-oxo)trichromium(III) complexes. Magnetic measurements were performed in the 2−300 K temperature range. For complex 1, in the high-temperature region (T > 8 K), experimental data could be satisfactorily reproduced by using an isotropic exchange ... |
| Databáze: | OpenAIRE |
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