TY - JOUR
T1 - Specific salt effects on energy transfer reactions from [Tb(2,6-pyridinedicarboxylate)3]3- to Co(III) complexes in aqueous solutions
AU - Iwamura, Munetaka
AU - Morita, Makoto
AU - Otsuka, Takuhiro
AU - Kaizu, Youkoh
PY - 2006/9/15
Y1 - 2006/9/15
N2 - 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- < ClO4-. The anion effect on the rate constants is discussed in terms of the variation of the distance between energy donor and acceptor in the encounter complexes surrounded by the indifferent ions. Both quenching reactions of [Tb(dpa)3]3--[Co(bpy)3]3+ and -[Co(en)3]3+ are less affected by coexisting cations. The anion salt effect in the Tb-Co systems is discussed with the comparison of [Ru(bpy)3]2+-[Cr(CN)6]3- system.
AB - 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- < ClO4-. The anion effect on the rate constants is discussed in terms of the variation of the distance between energy donor and acceptor in the encounter complexes surrounded by the indifferent ions. Both quenching reactions of [Tb(dpa)3]3--[Co(bpy)3]3+ and -[Co(en)3]3+ are less affected by coexisting cations. The anion salt effect in the Tb-Co systems is discussed with the comparison of [Ru(bpy)3]2+-[Cr(CN)6]3- system.
KW - Aqueous solution
KW - Complex
KW - Electron transfer
KW - Energy transfer
KW - Specific anion effect
KW - Specific cation effect
UR - http://www.scopus.com/inward/record.url?scp=33748438955&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2005.11.031
DO - 10.1016/j.molliq.2005.11.031
M3 - 学術論文
AN - SCOPUS:33748438955
SN - 0167-7322
VL - 128
SP - 71
EP - 76
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
IS - 1-3
ER -