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• W2924014317 abstract "Although dimer radical ions of aromatic molecules in the liquid-solution phase have been intensely studied, the understanding of charge-localized dimers, in which the extra charge is localized in a single monomer unit instead of being shared between two monomer units, is still elusive. In this study, the formation of a charge-localized dimer radical cation of 2-ethyl-9,10-dimethoxyanthracene (DMA), (DMA)2.+ is investigated by transient absorption (TA) and time-resolved resonance Raman (TR3 ) spectroscopic methods combined with a pulse radiolysis technique. Visible- and near-IR TA signals in highly concentrated DMA solutions supported the formation of non-covalent (DMA)2.+ by association of DMA and DMA.+ . TR3 spectra obtained from 30 ns to 300 μs time delays showed that the major bands are quite similar to those of DMA except for small transient bands, even at 30 ns time delay, suggesting that the positive charge of non-covalent (DMA)2.+ is localized in a single monomer unit. From DFT calculations for (DMA)2.+ , our TR3 spectra showed the best agreement with the calculated Raman spectrum of charge-localized edge-to-face T-shaped (DMA)2.+ , termed DT.+ , although the charge-delocalized asymmetric π-stacked face-to-face (DMA)2.+ , termed DF3.+ , is the most stable structure of (DMA)2.+ according to the energetics from DFT calculations. The calculated potential energy curves for the association between DMA.+ and DMA showed that DT.+ is likely to be efficiently formed and contribute significantly to the TR3 spectra as a result of the permanent charge-induced Coulombic interactions and a dynamic equilibrium between charge localized and delocalized structures." @default.
• W2924014317 created "2019-04-01" @default.
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• W2924014317 date "2019-03-20" @default.
• W2924014317 modified "2023-10-16" @default.
• W2924014317 title "Formation of the Charge‐Localized Dimer Radical Cation of 2‐Ethyl‐9,10‐dimethoxyanthracene in Solution Phase" @default.
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• W2924014317 doi "https://doi.org/10.1002/chem.201900175" @default.
• W2924014317 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30892780" @default.
• W2924014317 hasPublicationYear "2019" @default.
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