Electron Transfer Reactions Induced by Excited State Quenching
Electron Transfer Reactions Induced by Excited State Quenching
复制标题
激发态猝灭引起的电子转移反应
DOI：
--
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
T. Meyer
中科院分区：
文献类型：
--
作者：
T. Meyer
激发态的电子转移猝灭可以导致分离的氧化还原产物，对于该产物，反向电子转移可以是高度有利的。闪光光解的应用导致了一种弛豫技术，在该技术中，处于平衡状态的系统被单独的激发猝灭步骤扰动。几个电子转移反应的速率已经使用基于CT激发态Ru（bpy）2+−3的氧化还原猝灭的技术进行了研究。对于一系列激发态，包括CT（Ru（phen）2+3等）、π - π *（Pd（OEP））和f-f（Eu（phen）3+3）态的例子，也观察到猝灭和背电子转移。在最近的工作中，甚至非发射激发态已被证明是淬火的电子转移，这表明该技术可能具有广泛的适用性。在含有一种以上氧化还原试剂的适当设计的系统中，猝灭和反向电子转移步骤可以分开，并且已经研究了由激发态如Ru（bpy）2+−3光催化驱动的反应。该技术的修改已用于估计Ru（bpy）3+/2+3电对的自交换速率，并测量一系列系统的电子转移速率，其中测量的速率不涉及Ru电对。
Electron transfer quenching of excited states can lead to separated redox products for which back electron transfer can be highly favored. Application of flash photolysis leads to a relaxation technique in which a system at equilibrium is perturbed by separate excitation-quenching steps. The rates of several electron transfer reactions have been studied using the technique based on redox quenching of the CT excited state Ru(bpy)2+−3. Quenching and back electron transfer has also been observed for a series of excited states including examples of CT(Ru(phen)2+3, etc), π - π * (Pd(OEP)), and f-f(Eu(phen)3+3) states. In recent work, even non-emitting excited states have been shown to be quenched by electron transfer which suggests that the technique may have broad applicability. In properly designed systems containing more than one redox reagent, the quenching and back electron transfer steps can be separated and reactions have been studied which are driven photocatalytically by excited states like Ru(bpy)2+−3. A modification of the technique has been used to estimate the self-exchange rate for the Ru(bpy)3+/2+3 couple and to measure rates of electron transfer for a series of systems where the rates measured do not involve a Ru-couple.