Novel Effect of Additives on the Quenching Mechanism of the Excited State of Copolymer-Pendant [Ru(bpy)3]2+ by Methylviologen in Methyl Alcohol
- 1 July 1987
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 60 (7) , 2523-2529
- https://doi.org/10.1246/bcsj.60.2523
Abstract
The quenching of the excited state of acrylic acid copolymer-pendant [Ru(bpy)3]2+ by methylviologen (MV2+) was studied in methyl alcohol. The Stern–Volmer plots for the quenching showed a line or a curve (downward or upward) depending on the additive such as acid, alkali, or neutral salt in methyl alcohol. This behavior in methyl alcohol is entirely different from that in water where only dynamic quenching occurs. The behaviors in alcohol were analyzed by assuming stepwise binding of MV2+ into the domains around the Ru complex formed by the dissociated carboxylates and by considering dynamic as well as static quenching models. The one kind of photochemical reaction system showed four different quenching mechanisms induced by the additives.Keywords
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