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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Probing Exciton Localization/Delocalization: Transient dc Photoconductivity Studies of Excited States of Symmetrical Porphyrin Monomers, Oligomers, and Supramolecular Assemblies
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Probing Exciton Localization/Delocalization: Transient dc Photoconductivity Studies of Excited States of Symmetrical Porphyrin Monomers, Oligomers, and Supramolecular Assemblies

机译：探测激子定位/离域：对称卟啉单体，低聚物和超分子组装体激发态的瞬态直流光电导研究

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摘要

Solution-phase transient dc photoconductivity (TDCP) measurements are used to address the question of exciton localization/delocalization in strongly coupled oligomeric porphyrins and in well-defined, higher-order assemblies of oligomers (ladder and prism assemblies). The approach used is determination of the excited-state excess polarizability volume, Δα_v-a quantity known to report on exciton delocalization. The measurements reveal for the oligomers that singlet excitons are substantially delocalized but that triplet excitons are much more localized. For each of the two higher-order assemblies, the measurements reveal that excitons are transiently confined to individual oligomeric subunits rather than being delocalized over the entire assembly.
机译：溶液相瞬态直流光电导（TDCP）测量用于解决强耦合低聚卟啉和定义明确的高阶低聚物（梯形和棱镜形）中激子的定位/离域问题。所使用的方法是确定激发态过量极化率的体积Δα_v-已知报告激子离域的数量。测量结果表明，低聚物的单重态激子基本上已离域，而三重态激子则更局域化。对于两个高阶组件中的每一个，测量结果都显示激子被瞬时限制在单个寡聚亚基中，而不是在整个组件中被局域化。

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