Singlet oxygen reactivity in water-rich solvent mixtures

被引：10
|
作者：
Sousa, Cristina [1 ]
Botelho do Rego, Ana Maria [2 ]
Sa e Melo, Teresa [2 ]
机构：
[1] Univ Evora, Dept Quim, P-7000 Evora, Portugal
[2] Univ Tecn Lisboa, Inst Super Tecn, Ctr Quim Fis Mol, P-1049001 Lisbon, Portugal
来源：
QUIMICA NOVA | 2008年 / 31卷 / 06期
关键词：
singlet oxygen; psoralen; solvent effects;
D O I：
10.1590/S0100-40422008000600022
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The 3-methylindole (3MI) oxygenation sensitized by psoralen (PSO) has been investigated in 100%, 20% and 5% O-2-saturated water/dioxane (H2O/Dx) mixtures. The lowering of the O-1(2)*chemical rate when water (k(chem Delta)(3MI) = 1.4 x 109 M-1 s(-1)) is replaced by deuterated water (k(chem Delta)(3MI) = 1.9 x 108 M-1 s(-1)) suggests that hydrogen abstraction is involved in the rate determining step. A high dependence of the chemical rate constant on water concentration in H2O/Dx mixtures was found showing that water molecules are absolutely essential for the success of the 3MI substrate oxidation by O-1(2)*in water-rich solvent mixtures.
引用
收藏
页码：1392 / 1399
页数：8
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