Specific salt effects on energy transfer reactions from [Tb(2,6-pyridinedicarboxylate)3]3− to Co(III) complexes in aqueous solutions

Specific cation and anion effects are investigated on reactions of energy transfer from [Tb(dpa)3]3− (dpa=2,6-pyridinedicarboxylate) to [Co(bpy)3]3+ (bpy=2,2′-bipyridine), [Co(en)3]3+ (en=ethylenediamine), [Co(pam)3]3+ (pam=2-aminomethylpyridine) and [Co(NH3)6]3+ in aqueous solutions. Quenching rate constants of [Tb(dpa)3]3− by [Co(bpy)3]3+ are changed by the added anions in the following order, Cl−>Br−>ClO4−. However, the order of the quenching rate constants of [Tb(dpa)3]3− by [Co(en)3]3+, [Co(pam)3]3+ and [Co(NH3)6]3+ is different, Cl−≈Br−更多