Predictable electronic tuning of Fe^II and Ru^II complexes via choice of azine: correlation of ligand pK_a with E_pa(M^III/II) of complex

Abstract

Five new mononuclear ruthenium(II) tris-ligated complexes have been synthesised, varying the choice of azine in the family of 3-azinyl-4-(4-methylphenyl)-5-phenyl-4H-1,2,4-triazole ligands (Lazine): [Ru(Lpyridine)](PF6)2 (1), [Ru(Lpyridazine)](PF6)2 (2), [Ru(L4-pyrimidine)](PF6)2 (3), [Ru(Lpyrazine)](PF6)2 (4), [Ru(L2-pyrimidine)](PF6)2...