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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Multistep Electron Transfer Systems Containing [2.2]- or [3.3]Paracyclophane
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Multistep Electron Transfer Systems Containing [2.2]- or [3.3]Paracyclophane

机译:包含[2.2]-或[3.3]吡喃环烷的多步电子转移系统

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摘要

Paracyclophanes (PCPs), which exhibit interesting properties due to their transannular interactions, have been employed as a spacer in various electron transfer (ET) systems. In the present work, we investigated ET processes in dyads and triads containing [2.2]PCP or [3.3]PCP as donors to study their properties in multistep ET processes. The dyad molecules of PCP and 1,8-naphthalimide (NI) as a photosensitizing electron acceptor exhibited charge separation (CS) upon excitation of NI. In addition, triads of NI, PCP, and carbazole showed charge shift after an initial CS, thus confirming multistep ET. In this study, we demonstrated that use of [3.3]PCP in place of [2.2]PCP enhanced the initial CS rate. Lower oxidation potentials and a smaller reorganization energy for [3.3]PCP are shown to be key factors for this enhanced CS rate. Both of these properties are closely related to the strained structure of PCP; hence, the present results demonstrate the importance of strain in ET chemistry.
机译:由于对环芳烃的跨环相互作用,其表现出令人感兴趣的特性,其已被用作各种电子转移(ET)系统中的间隔基。在目前的工作中,我们调查了以[2.2] PCP或[3.3] PCP作为供体的二元组和三元组的ET过程,以研究其在多步ET过程中的特性。 PCP和1,8-萘二甲酰亚胺(NI)的二聚体分子作为光敏电子受体,在NI激发后表现出电荷分离(CS)。此外,NI,PCP和咔唑的三联体在初始CS后显示电荷转移,从而证实了多步ET。在这项研究中,我们证明了使用[3.3] PCP代替[2.2] PCP可以提高初始CS率。 [3.3] PCP的较低的氧化电位和较小的重组能被证明是提高CS速率的关键因素。这两个特性都与PCP的应变结构密切相关。因此,目前的结果证明了应变在ET化学中的重要性。

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