Ruthenium(II) Complexes with (3-Polyamino)phenanthrolines: Synthesis and Application in Sensing of Cu(II) Ions

This work deals with the development of water-soluble optical sensors based on ruthenium(II) tris(diimine) complexes that exhibit high molar absorptivity and are emissive in aqueous media. Palladium-catalyzed arylation polyamines 3-bromo-1,10-phenanthroline (Brphen) [Ru(bpy)2(Brphen)](PF6)2 (bpy = 2,2’-bipyridine) was explored to prepare Ru2+ 1,10-phenanthrolines (phen) substituted by linear (PAs) at position 3 heterocycle ([Ru(bpy)2(phen–PA)](PF6)2). The most convenient synthetic pathway leading target molecular probes includes preparation phen–PA ligands, followed ruthenium complexation using cis-Ru(bpy)2Cl2. Complexes bearing a polyamine chain directly linked phenanthroline core media their quantum yields comparable parent [Ru(bpy)3](PF6)2. Their structure can be easily adapted for detection various analytes modification amine groups. As an example, we prepared complex Ru(N2P2phen) which is suitable dual channel (spectrophotometry luminescence (ON–OFF probe)) selective Cu2+ ions physiological pH levels limits (LOD) spectrophotometry fluorescence spectroscopy equal 9 6 ?M, respectively, lower than action level drinking water copper as prescribed US Environmental Protection Agency.