Theoretical formulation for electron transfer coupled to multiple protons: Application to amidinium-carboxylate interfaces

Theoretical formulation for electron transfer coupled to multiple protons: Application to amidinium-carboxylate interfaces
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与多个质子耦合的电子转移的理论公式:在脒-羧酸盐界面的应用

DOI:
10.1063/1.1376143
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发表时间:
2001
影响因子:
4.4
通讯作者:
S. Hammes‐Schiffer
S. Hammes‐Schiffer
中科院分区:
化学2区
文献类型:
--
作者:
I. Rostov;S. Hammes‐Schiffer

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本文提出了与多个质子运动耦合的电子转移的理论公式。该理论应用于通过脒-羧酸盐桥的质子耦合电子转移(PCET),其中电子转移反应与质子转移界面处两个质子的运动耦合。发现供体-(脒-羧酸盐)-受体系统的速率明显慢于切换界面供体-(羧酸盐-脒)-受体系统的速率。这一趋势与类似系统中光诱导 PCET 的实验数据一致。计算表明,这种速率差异主要是由于两个系统的质子转移界面处的偶极矩相反,导致供体-(脒-羧酸盐)-受体系统发生吸热反应,而供体-(羧酸盐-脒)-受体系统发生放热反应。发现氘动力学同位素效应对于……来说是中等的(即 kH/kD<3)。
This paper presents a theoretical formulation for electron transfer coupled to the motion of multiple protons. This theory is applied to proton-coupled electron transfer (PCET) through amidinium–carboxylate salt bridges, where the electron transfer reaction is coupled to the motion of two protons at the proton transfer interface. The rate for the donor–(amidinium–carboxylate)–acceptor system is found to be substantially slower than the rate for the switched interface donor–(carboxylate–amidinium)–acceptor system. This trend is consistent with experimental data for photoinduced PCET in analogous systems. The calculations indicate that this difference in rates is due mainly to the opposite dipole moments at the proton transfer interfaces for the two systems, leading to an endothermic reaction for the donor–(amidinium–carboxylate)–acceptor system and an exothermic reaction for the donor–(carboxylate–amidinium)–acceptor system. The deuterium kinetic isotope effects are found to be moderate (i.e., kH/kD<3) for...
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