Synthesis and characterization of ionic Ru(III) complexes containing dimethylsulfoxide and dinitrogen heterocyclic ligands

Article abstract of DOI:10.1016/j.poly.2007.03.041

Several new Ru(III) DMSO compounds including [PPh₄]trans-[Ru(DMSO)₂Cl₄], [PPh₄]trans-[Ru(DMSO)(pyrazine)Cl₄] (2), [PPh₄]trans-[Ru(DMSO)(4,4′-bipyridine)Cl₄] and [PPh₄]trans-[Ru(DMSO)(pyrimidine)Cl₄] were reported and characterized. The crystal structure of 2 and its Na⁺ analogue were determined by X-ray diffraction methods. The PPh₄⁺ complex 2 is a discrete ionic compound, while the compound [Na]trans-[Ru(DMSO)(pyrazine)Cl₄] · DMSO (3) crystallized with a molecule of DMSO. The environment around the Na atom is a distorted octahedron with short contacts with three chloro ligands, two O atoms from the bonded and unbonded DMSO molecules, and the unbonded N atom of the pyrazine ligand. The Na atoms form bridges between the complexed anions in 3 resulting in the formation of infinite chains or ribbons parallel to the b axis. The chains are held together by van der Waals interactions.