Abstract
The absorption spectra of three representative uracil derivatives (uracil, thymine, and 5-fluorouracil) in aqueous solution are investigated by the QM/MM approach, where the CASPT2 method is employed to evaluate the excitation energies. The computed absorption spectra are in good agreement with the experimental results, and in particular, the relative values of the absorption maximum between these derivatives are well reproduced in the simulations.
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