Excited electronic states’ properties of guanine quartet complexes with alkali metal cations

Branislav Milovanović, Milena Petković, Mihajlo Etinski


G-quartets are supra-molecular structures which consist of four guanine molecules connected by eight hydrogen bonds. They are additionally stabilized by metal cations. In this contribution we study excited states of G-quartet and its complexes with lithium, sodium and potassium by employing time-dependent density functional theory. Our findings indicate that vertical excitations from the optimized ground state involve transitions from several bases, whereas excitations from the optimized lowest excited state include transitions from one base. The charge-transfer character of these states was analyzed. We show that the cations are able to modify fluorescence spectra maxima positions of the complexes.


density functional theory; G-quadruplex; fluorescence

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DOI: https://doi.org/10.2298/JSC191025140M

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