Abstract
4′-[4-(Bromomethyl)phenyl]-2,2′:6′,2″-terpyridine reacts with triethylenetetraamine or tetraethylenepentaamine in CH2Cl2 to yield the ligands L1 and L2, respectively. Reaction of L1 and L2 with Ru(mtpy)Cl3 (mtpy = 4′-methyl-2,2′:6′,2″-terpyridine) in MeOH yielded, after column chromatography and precipitation with [NH4][PF6], the compounds [Ru(L1)(mtpy)][PF6]2 and [Ru(L2)(mtpy)][PF6]2. These metallo-receptors contain triethylenetetraamine or tetraethylenepentaamine recognition sites and [Ru(tpy)2]2+ cores as fluorescent signalling subunits. The fluorescent behaviour of [Ru(L1)(mtpy)]2+ and [Ru(L2)(mtpy)]2+ in the presence of metal ions and anions has been studied in MeCN:H2O (70:30 v/v) as a function of the pH.
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