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Counter Ion Effect on Photoinduced Electron Transfer Reaction between Ruthenium Complexes
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1995, v.8 no.4, pp.481-486
Sonoyama,
N., &
Kaizu,
Y.
(1995). Counter Ion Effect on Photoinduced Electron Transfer Reaction between Ruthenium Complexes. Analytical Science and Technology, 8(4), 481-486.
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Abstract
Quenching experiments by photoinduced electron transfer between a charged donor and a neutral acceptor were carried out in acetonitrile, dichloromethane and mixed solvents of acetonitrile and dichloromethane. Tris(2, 2'-bipyridine) ruthenium(II) (<TEX>$[Ru(bpy)_3]^{2+}$</TEX>) which has 2+ charge and dicyanobis (2, 2'-bipyridine) ruthenium(II) (<TEX>$Ru(bpy)_2(CN)_2$</TEX>) which has no charge were used as electron donors, and a series of tris(<TEX>${\beta}$</TEX>-diketonato) ruthenium (III) was used as acceptor. In dichloromethane, <TEX>$[Ru(bpy)_3]^{2+}$</TEX> and its counter ions (<TEX>$ClO{_4}^-$</TEX>) form ion pair. In the estimate of <TEX>${\Delta}G$</TEX> of electron transfer, the electrostatic potential between counter ions and product ion pair produced by electron transfer must be taken into account. A similar effect of counter ions was found in mixed solvents of 10, 30, 50, 70 and 90% acetonitrile ratio in volume. The effect of counter ion on <TEX>${\Delta}G$</TEX> became smaller with the increase in acetonitrile ratio. The result in mixed solvents suggests that <TEX>$[Ru(bpy)_3]^{2+}$</TEX> and its counter ions form ion pair even in 90% acetonitrile solution.
- keywords
- Photoimduced electron transfer, Ion pair formation, Electrostatic interaction, ionization in mexed solvent
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