A trinuclear ruthenium(II) compiler with rare S,O-bridging sulfoxide ligands

The trimetallic compound [Ru-3(mu-mpso-S,O)(2)(mu-Cl)(4)(mpso-S)(4)Cl-2] (m pso = C7H8OS, methyl phenyl sulfoxide) 1 was prepared from hydrated RuCl3 a nd methyl phenyl sulfoxide. A crystal structure determination revealed a li nearly arranged molecule with three ruthenium atoms in distorted octahedral configurations with bridging chloro and S,O-mpso ligands. For the rutheniu m metals with triply bridged chloro ligands, the Ru-Cl-Ru angles are 81.8(4 ), 82.7(1) and 83.2(1)degrees, and the Ru ... Ru non-bonded distance is 3.2 18 Angstrom. In contrast, the Ru-Cl-Ru angle on the bridging mpso part of t he molecule is 100.7(1)degrees, and the Ru ... Ru non-bonded distance is 3. 686 Angstrom. The configuration at sulfur on S2, S4 and S5 is opposite to t hat at S1, S3 and S6. In solution, the methyl resonances in the H-1 and C-1 3 NMR spectra of 1 are found in the delta ranges 3.81-2.70 and 49.7-44.9, r espectively. The methyl resonances of the S,O-bridging mpso ligands are shi fted upheld in the H-1 NMR spectrum, but furthest downfield in the C-13 NMR spectrum.