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The 2,6-diaminopyridine-based mixed-donor PNP ligands, developed by both the Haupt and Kirchner groups, are advantageous because the donor ability and the steric property can be easily modulated.1–3 Here, we report on the synthesis and X-ray crystal structure of an open-face ruthenium complex that is a potentially useful starting complex. The three chlorido ligands in the title compound, [RuCl3{N,N¢bis(diphenylphosphino)-2,6-diaminopyridine}] (1), can thus be replaced by other ligands on demand to produce a wide variety of ruthenium complexes bearing the PNP ligand. Crystal data are summarized in Table 1. A single crystal was mounted on a MicroMountTM (MiTeGen). Diffraction data were collected on a Rigaku Saturn 724 diffractometer. The data were integrated, scaled, sorted, and averaged using CrystalClear software. Absorption corrections were applied using the Coppens numerical method. The structure was solved using the SIR92 direct method, and refined using CRYSTALS on CrystalStructure 4.0. All non-hydrogen atoms were refined anisotropically. All hydrogen atoms were located on the calculated positions and refined as riding models. Complex 1 was synthesized as follows: To an orange solution of trans-[RuCl2{N,N¢-bis(diphenylphosphino)-2,6-diaminopyridine}(dimethylsulfoxide)]4 (100 mg, 0.137 mmol) in acetone (10 mL) was added concentrated aqueous HCl (3 mL). The solution was stirred for 14 h under air. After removal of the solvent in vacuo, the residue was dissolved in a mixture of methanol and acetone (2/1 v/v) to afford 1·3CH3OH as green crystals. Yield: 35 mg (38%). m/z = 685.1 (ESI-MS). Elemental analysis for C32H37Cl3N3O3P2Ru: calcd (%). C 49.21, H 4.76, N 5.38; found (%). C 48.98, H 4.72, N 5.48. Kirchner et al. reported that the synthesis and characterization X-ray Structure Analysis Online

x-ray structure analysis online

Synthesis and Crystal Structure of [RuCl&lt;sub&gt;3&lt;/sub&gt;{&lt;i&gt;N&lt;/i&gt;,&lt;i&gt;N&lt;/i&gt;′-bis(diphenylphosphino)-2,6-diaminopyridine}]·3CH&lt;sub&gt;3&lt;/sub&gt;OH