Synthesis and characterization of [Ru(η6-C10H14)(dppf)X][PF6] (X = Cl, Br, I, SnF3) compounds: The X-ray structure of [Ru(η6-C10H14)(dppf)Cl][SnCl3]·0.45CH2Cl2

The arene–ruthenium complex [Ru(η6-C10H14)(dppf)Cl]PF6 (1) was used as a precursor for the syntheses of the [Ru(η6-C10H14)(dppf)Br]PF6 (2), [Ru(η6-C10H14)(dppf)I]PF6 (3), [Ru(η6-C10H14)(dppf)SnF3]PF6 (4) and [Ru(η6-C10H14)(dppf)Cl][SnCl3]·0.45CH2Cl2 (5) complexes by its reactions with KBr, KI, SnF2 and SnCl2, respectively. All of the compounds were characterized by NMR, IR, 57Fe and 119Sn-Mössbauer spectroscopy, and cyclic voltammetry. The single-crystal X-ray structure analysis of the [Ru(η6-C10H14)(dppf)Cl][SnCl3]·0.45CH2Cl2 complex revealed the expected piano-stool geometry. Cyclic voltammograms of the complexes showed only one quasi-reversible electrochemical process, involving the oxidation of Fe(II) and Ru(II) at the same potential, which was confirmed by exhaustive electrolysis experiments. 57Fe-Mössbauer parameters obtained for the complexes (1–5) were fitted with one doublet corresponding to a site of one iron(II). The 119Sn-Mössbauer parameters of the complex (4) indicate that tin is tetra covalent.

Graphical abstractA series of Ru–arene complexes have been synthesized and characterized. The structure of [Ru(η6-C10H14)(dppf)Cl][SnCl3] was determined by X-ray difraction.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The syntheses of Ru–arene complexes were provided. ► The structural properties of the complexes were explored by 57Fe and 119Sn-Mössbauer spectroscopy and electrochemistry. ► The novel [Ru(η6-C10H14)(dppf)Cl][SnCl3] complex was characterized by X-ray crystallography.