77321-09-6Relevant academic research and scientific papers
Use of Silver(I) Complexes in Synthesis of Bis- and Tris- Complexes of Ruthenium(II) and Investigation of Solid-state Isomerisation
Deb, Alok K.,Kakoti, Maushumi,Goswami, Sreebrata
, p. 3249 - 3252 (2007/10/02)
Efficient, new and direct synthetic routes to isomeric and 2*H2O complexes, based on the reaction of hydrated RuCl3 and ClO4, have been elaborated.The identity of the compounds were established from el
Chemistry of ruthenium. 2. Synthesis, structure, and redox properties of 2-(arylazo)pyridine complexes
Goswami,Chakravarty,Chakravorty
, p. 2246 - 2250 (2008/10/08)
Two types of ruthenium(II) complexes RuX2L2 (green) and [Ru(bpy)2L] (ClO4)2·H2O (red) are reported (X = Cl, Br, I; L = 2-(phenylazo)pyridine or 2-(m-tolylazo)pyridine; bpy = 2,2′-bipyridine). The RuX2L2 species systematically displays single RuX and RuN(pyridine) stretches in the far IR, strongly suggesting a centrosymmetric configuration for the coordination sphere. Both types of complexes have intense t2(Ru) → π*(L) transitions in the visible region. RuCl2L2 is unreactive to Ag+ and nitrogen bases; monodentate tertiary phosphines (P) however give RuClPL2+. Both RuX2L2 and Ru(bpy)2L2+ exhibit reversible or nearly reversible ruthenium(III)-ruthenium(II) couples at platinum electrode. The E°298′ values in acetonitrile are ～+0.9 V for RuX2L2+/RuX2L2 and ～+1.60 V for Ru(bpy)2L3+/Ru(bpy)2L2+ vs. SCE. The azopyridine ligand system greatly stabilizes the +2 oxidation state in ruthenium. The complexes also display electrochemical responses on the negative side of SCE due to ligand-based reductions. Azo reduction occurs quasi-reversibly at ～-0.5 V in Ru(bpy)2L2+. The existence of a blue isomer of RuX2L2 (X = Cl, Br) having cis-RuX2 is briefly noted.
