Controlling the electronic density of the [Ru2(DPhF)3(O2CR)] core to obtain one-dimensional compounds |
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Authors: | Elena Añez Santiago Herrero Reyes Jiménez-Aparicio José L Priego M Rosario Torres Francisco A Urbanos |
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Institution: | 1. Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid, Spain;2. Centro de Asistencia a la Investigación de Rayos X, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid, Spain |
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Abstract: | The substitution of the acetate ligand in Ru2Cl(DPhF)3(O2CMe)] (DPhF− = N,N′-diphenylformamidinate) by the pentafluorobenzoate group gives the complex Ru2Cl(DPhF)3(O2CC6F5)(OH2)] (1), and the reaction of 1 with AgSO3CF3 leads to the compound Ru2(DPhF)3(O2CC6F5)(OH2)2]SO3CF3 (2). The low donor character of the pentafluorobenzoate ligand compared to the acetate group decreases the electron density of the Ru25+ unit which permits ligands to bond at both axial positions of the diruthenium moiety. The use of the Au(CN)2]− group yields the new complex {Ru2(DPhF)3(O2CC6F5)]Au(CN)2]} (3). Complexes 1–3 are characterized by elemental analysis, 19F{1H} NMR, IR and electronic spectroscopy, mass spectrometry and variable-temperature magnetic measurements. The crystal structure of 2·H2O is also reported. The magnetic properties of complex 1 is in accordance with the ground-state configuration σ2π4δ2(π*δ*)3. In contrast, the slope of representation of the magnetic moment towards temperature in complex 2 indicates a gradual transition from essentially high spin (S = 3/2) to low spin (S = 1/2) configuration. |
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Keywords: | Ruthenium Metal&ndash metal bond Multiple bonds Molecular wires Magnetism |
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