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- W2047749901 endingPage "4307" @default.
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- W2047749901 abstract "Push−pull substituted fluorenes are considered for use as dynamic solvation probes in polynucleotides. Their fluorescence band is predicted (by simulations) to show weak spectral oscillations on the subpicosecond time scale depending on the nucleotide sequence. The oscillations reflect the local far-infrared spectrum of the environment around the probe molecule. A connection is provided by the continuum theory of polar solvation which, however, neglects molecular aspects. We examine the latter using acetonitrile solution as a test case. A collective librational solvent mode at 100 cm-1 is observed with 2-amino-7-nitrofluorene, 2-dimethylamino-7-nitrofluorene, 2-hydroxy-7-nitrofluorene, and its 2‘-deoxyriboside. Different strengths of the oscillation indicate that rotational friction of nearby acetonitrile molecules depends on the solute structure or that H bonding is involved in launching the librational coherence. Polar solvation in methanol is used for comparison. With hydroxynitrofluorenes, the observation window is limited by intersystem crossing for which rates are reported. A prominent excited-state absorption band of nitrofluorenes at 430 nm can be used to monitor polar solvation. Structural and electronic relaxation pathways are discussed with the help of quantum chemical calculations." @default.
- W2047749901 created "2016-06-24" @default.
- W2047749901 creator A5028050268 @default.
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- W2047749901 creator A5078746031 @default.
- W2047749901 creator A5086435021 @default.
- W2047749901 date "2008-04-03" @default.
- W2047749901 modified "2023-10-18" @default.
- W2047749901 title "Solvation Oscillations and Excited-State Dynamics of 2-Amino- and 2-Hydroxy-7-nitrofluorene and Its 2‘-deoxyriboside" @default.
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