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• W2313016780 endingPage "4532" @default.
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• W2313016780 abstract "Cycloparaphenylenes (CPPs), a class of hoop-shaped conjugated macrocycles, have attracted the attention of researchers in various fields because of their interesting properties. Although their properties in the singlet-excited state have been reported, there is no systematic information on the triplet-excited state. In the present study, the properties of triplet-excited [n]CPP (n = 8–12, where n denotes the number of phenyl rings) were comprehensively investigated. The phosphorescence peak shifted to the shorter-wavelength side with increasing ring size of the CPPs, indicating smaller triplet energy for smaller CPPs. It was found that the triplet energy of a smaller CPP is even smaller than those of poly(p-phenylene)s, indicating that small hoop-shaped conjugated macrocycles are effective in realizing low-band gap materials. By applying laser flash photolysis, the Tn–T1 absorption spectra of CPPs were obtained, from which the size-dependence of energy levels of higher triplet states were also determined. Generation of singlet oxygen by the energy transfer from a triplet-excited CPP was confirmed. The generation yield became smaller with increasing size of the CPP in accordance with the triplet yield. From these observations, the size-dependence of the deactivation pathways is explained." @default.
• W2313016780 created "2016-06-24" @default.
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• W2313016780 date "2014-06-17" @default.
• W2313016780 modified "2023-10-08" @default.
• W2313016780 title "Properties of Triplet-Excited [<i>n</i>]Cycloparaphenylenes (<i>n</i> = 8–12): Excitation Energies Lower than Those of Linear Oligomers and Polymers" @default.
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• W2313016780 doi "https://doi.org/10.1021/jp504689q" @default.
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• W2313016780 hasPublicationYear "2014" @default.
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