Synthesis, Bonding and Single-Crystal X-ray Structure of a Heteroleptic Ruthenium(II) Complex Bearing N-P and O-N-O Ligands

The new heteroleptic ruthenium complex [Ru(N-P)(O-N-O)(DMSO)], with N-P = 8-(diphenylphosphino)quinoline, O-N-O = 2,6-pyridinedicarboxylate and DMSO = dimethylsulfoxide, was prepared and characterized by FT-IR, 1H-, 13C-NMR, micro-elemental analysis and X-ray crystallography. The complex has a distorted octahedral geometry with the O-N-O ligand occupying meridional sites. The Ru-N (pyridine) bond distance is shorter by 0.13 Å than Ru-N (quinoline). These bond distances were compared to all published Ru complexes with Ru-N bonds in the Cambridge Crystallographic Database. Also, the Ru-N bond distances in the complex were investigated by the Quantum Theory of Atoms in Molecules (QTAIM).