Mononuclear arene ruthenium complexes containing 5,6-diphenyl-3-(pyridine-2-yl)-1,2,4-triazine as chelating ligand: Synthesis and molecular structure

The mononuclear cations of the general formula [(η⁶-arene)RuCl(pdpt)]+ (pdpt = 5,6-diphenyl-3-(pyridine-2-yl)-1,2,4-triazine; arene = C₆H₆ (<b>1</b>); C₆H₅Me (2); <i>p</i>-Pr^<i>i</i>C₆H₄Me (3); C₆Me₆ (<b>4</b>)) have been synthesised from 5,6-diphenyl-3-(pyridine-2-yl)-1,2,4-triazine (pdpt) and the corresponding chloro complexes [(η⁶-C₆H₆)Ru(μ-Cl)Cl] ₂, [(η⁶-C₆H₅Me)Ru(μ-Cl)Cl]₂, [(η⁶<i>p</i>-Pr^<i>i</i>C₆H₄Me)Ru(μ-Cl)Cl]₂ and [(η⁶-C₆Me₆)Ru(μ-Cl)Cl]₂, respectively. The X-ray crystal structure analyses of [<b>1</b>][PF₆] • (C₆H₆)_2.5 and [<b>2</b>][PF₆] • (CH₃CN)2 reveal a typical piano-stool geometry around the metal centre and in the crystal packing a complexed networks of intermolecular interactions.