Tetra(3-methoxypropionato)diruthenium(II, III) Units: Supramolecular Organization in the Complex [Ru2(μ-O2CCH2CH2OMe)4(H2O)2]BF4

• Published in: Zeitschrift für anorganische und allgemeine Chemie (1950) 2005-08, Vol.631 (11), p.2075-2080
• Main Authors: Barral, M. Carmen, González-Prieto, Rodrigo, Jiménez-Aparicio, Reyes, Priego, J. Luis, Royer, Elia C., Torres, M. Rosario, Urbanos, Francisco A.
• Format: Article
• Language: English
• Subjects: Carboxylate complexes; Diruthenium compounds; Metal-metal bonds; Multiple bonds; Ruthenium complexes
• ISSN: 0044-2313; 1521-3749
• DOI: 10.1002/zaac.200570017

The synthesis and characterization of Ru2Cl(μ‐O2CCH2CH2OMe)4 (1), [Ru2(μ‐O2CCH2CH2OMe)4(H2O)2]BF4 (2), PPh4[Ru2Cl2(μ‐O2CCH2CH2OMe)4] (3), (PPh4)2[Ru2Br2(μ‐O2CCH2CH2OMe)4]NO3 (4), and (PPh4)2[Ru2I2(μ‐O2CCH2CH2OMe)4]I0.5(NO3)0.5 (5), are described. The structure of complexes 2–5 was established by single crystal X‐ray diffraction. All complexes show a diruthenium(II, III) unit bridged by four 3‐methoxypropionate ligands. The cationic complex 2 have two axially coordinated water molecules, with a Ru–Ru bond distance of 2.2681(12) Å. This complex shows a supramolecular two‐dimensional organization across hydrogen bonded between the axial water molecules and two methoxy groups of adjacent diruthenium units. The metal‐metal bond lengths, in the anionic complexes 3, 4, and 5, are 2.3039(5), 2.3077(6), and 2.3115(8) Å, respectively. These distances are longer than the observed in compound 2. In the anionic complexes, the axial positions of the diruthenium units are occupied by two halide ligands. Complexes 3–5 have PPh4+ cations as counterion, although 4 and 5 are double salts with PPh4NO3 and PPh4I0.5(NO3)0.5, respectively. All compounds have been also characterized by elemental analysis, magnetic measurements, and spectroscopic techniques.