Synthesis and characterization of bis(bipyridine)ruthenium(II) complexes with bromo or protected ethynyl β-diketonato ligands

A protected ethynyl group was introduced into a γ-position of a (β-diketonato)bis(bipyridine)ruthenium(II) complex through the reaction of the bromo complex and (triisopropylsilyl)-acetylene with very good yield under microwave irradiation. Two new mononuclear mixed-ligand ruthenium(II) complexes with bipyridine (bpy) and functionalized acetylacetonate ion (2,4-pentanedionate, acac−), [Ru(bpd)(bpy)2](PF6) (2; bpy = 2,2′-bipyridine, bpd = 3-Bromo-2,4-pentanedionate ion) and [Ru(tipsepd)(bpy)2](PF6) (3; tipsepd = 3-((triisopropylsilyl)ethynil)-2,4-pentanedionate ion) were then prepared as candidates for building blocks. The 1H NMR, UV–Vis, electrochemistry and FAB mass spectral data of these complexes are presented. X-Ray single crystal diffraction analysis has been made on complex 2, it crystallized with empirical formula of C25H22BrF6N4O2PRu, in a monoclinic crystal system and space group C2/c with a = 29.340(5) Å, b = 13.282(2) Å, c = 15.7492 (14) Å, β = 109.452(8)°, V = 5786.9(13) Å3 and Z = 8.