Green, James A.; Jouybari, Martha Yaghoubi; Aranda, Daniel; Improta, Roberto; Santoro, Fabrizio published an article in 2021, the title of the article was Nonadiabatic absorption spectra and ultrafast dynamics of DNA and RNA photoexcited nucleobases.Electric Literature of 65-71-4 And the article contains the following content:
We have recently proposed a protocol for Quantum Dynamics (QD) calculations, which is based on a parameterisation of Linear Vibronic Coupling (LVC) Hamiltonians with Time Dependent (TD) D. Functional Theory (TD-DFT), and exploits the latest developments in multiconfigurational TD-Hartree methods for an effective wave packet propagation. In this contribution we explore the potentialities of this approach to compute nonadiabatic vibronic spectra and ultrafast dynamics, by applying it to the five nucleobases present in DNA and RNA. For all of them we computed the absorption spectra and the dynamics of ultrafast internal conversion (100 fs timescale), fully coupling the first 2-3 bright states and all the close by dark states, for a total of 6-9 states, and including all the normal coordinates. We adopted two different functionals, CAM-B3LYP and PBE0, and tested the effect of the basis set. Computed spectra are in good agreement with the available exptl. data, remarkably improving over pure electronic computations, but also with respect to vibronic spectra obtained neglecting inter-state couplings. Our QD simulations indicate an effective population transfer from the lowest energy bright excited states to the close-lying dark excited states for uracil, thymine and adenine. Dynamics from higher-energy states show an ultrafast depopulation toward the more stable ones. The proposed protocol is sufficiently general and automatic to promise to become useful for widespread applications. The experimental process involved the reaction of 5-Methylpyrimidine-2,4(1H,3H)-dione(cas: 65-71-4).Electric Literature of 65-71-4
The Article related to dna rna photoexcitation nucleobase absorption spectra, nonadiabatic interactions, nucleobases, photoinduced processes, quantum dynamics, vibronic spectra, Biochemical Methods: Spectral and Related Methods and other aspects.Electric Literature of 65-71-4
Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia