Cation effect on energy transfer reactions from [Tb(2,6-pyridinedicarboxylate)3] to anionic chromium(III) and neodymium(III) complexes in aqueous solutions |
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| Authors: | Munetaka Iwamura Makoto Morita |
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| Institution: | Department of Applied Chemistry, Seikei University, 3-3-1 Kichijoji, kitamachi Musashino-shi, Tokyo 180-8633, Japan |
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| Abstract: | Cation effects are studied on the excitation energy transfer reaction between anionic complexes, i.e., Tb(dpa)3]3− (dpa=2,6-pyridinedicarboxylate) quenched by Cr(ox)3]3− (ox=oxalate ion), Cr(mal)3]3− (mal=malonate ion) and Nd(dpa)3]3− in aqueous solutions in the presence of alkali metal ions added for adjustments of ionic strengths. In the quenching reaction of Cr(ox)3]3−, magnitudes of quenching rate constants (kq) and energy transfer rate constant in encounter complex (k1) are changed by the cations in the order of Li+ < Na+ < K+ ≈ Rb+ ≈ Cs+, that is quite contrary of the cation effect on energy transfer reaction between Ru(N-N)3]2+ and Cr(ox)3]3−, reported in the previous paper. On the other hand, the rate constants in quenching reactions by Cr(mal)3]3− and Nd(dpa)3]3− remain almost constant. This result indicates that more separated donor-acceptor pair is not sensitive to coexisting cations. |
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| Keywords: | Quenching Salt effect Energy transfer Electron transfer Aqueous solution Complex |
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