Nonadiabatic Excited-State Dynamics of Aromatic Heterocycles: Toward the Time-Resolved Simulation of Nucleobases

Mario Barbatti, Bernhard Sellner, Adélia J.A. Aquino, Hans Lischka

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

2 Scopus citations

Abstract

Ab inito molecular dynamics, although still challenge, is becoming an available tool for the investigation of the photodynamics of aromatic heterocyclic systems. Potential energy surfaces and dynamics simulations for three particular examples and different aspects of the excited and ground state dynamics are presented and discussed. Aminopyrimidine is investigated as a model for adenine. It shows ultrafast S1-S0 decay in about 400 fs. The inclusion of mass-restrictions to emulate the imidizole group increases the lifetime to about 950 fs, a value similar to the lifetime of adenine. The S2-S1 deactivation, typical in the fast component of the decay of nucleobases, is investigated in pyridone. In this case, the S2-state lifetime is 52 fs. The hot ground-state dynamics of pyrrole starting at the puckered conical intersection is shown to produce ring-opened structures consistent with the experimental results.

Original languageEnglish
Title of host publicationChallenges and Advances in Computational Chemistry and Physics
PublisherSpringer
Pages209-235
Number of pages27
DOIs
StatePublished - 2008

Publication series

NameChallenges and Advances in Computational Chemistry and Physics
Volume5
ISSN (Print)2542-4491
ISSN (Electronic)2542-4483

Keywords

  • Excited State
  • Heteroaromatic Molecules
  • Nonadiabatic Dynamics
  • Surface Hopping

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