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- W2066888531 abstract "We demonstrate that THz vibrational activity of a biopolymer can be measured locally, on the effective length scale for polar solvation, with an embedded molecular probe. For this purpose, the polarity probe 2-hydroxy-7-nitrofluorene was linked into a 13mer DNA duplex opposite an abasic site. The NMR solution structure shows that the fluorene moiety occupies a well-defined position in place of a base pair but can flip around the long axis on a millisecond time scale. Femtosecond optical pump−probe experiments are used to measure the time-resolved Stokes shift of emission from the probe. The dynamic shifts for solution in H2O and D2O are quantified. Their difference is much larger than that expected for free water, implying that only bound water is observed. A weak 26 cm−1 spectral oscillation of the emission band is observed, which is not present when the probe is free in solution and is therefore caused by the supramolecular structure (DNA and hydration water)." @default.
- W2066888531 created "2016-06-24" @default.
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- W2066888531 date "2009-09-18" @default.
- W2066888531 modified "2023-10-18" @default.
- W2066888531 title "Local THz Time Domain Spectroscopy of Duplex DNA via Fluorescence of an Embedded Probe" @default.
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- W2066888531 doi "https://doi.org/10.1021/jp906037g" @default.
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- W2066888531 hasPublicationYear "2009" @default.
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