Abstract
With the aid of density functional theory (DFT) and time-dependent DFT simulations, the adsorption of 2-amino-1,7-dihydropurin-6-one (ADO) on coronene and coronene that has been doped with boron and nitrogen has been investigated. While conducting this study, the binding energy, charge analysis, orbital analysis, quantum theory of atom in molecules (QTAIM) and surface enhanced Raman spectroscopy (SERS) were taken into account. The coronene sheet serves as an electron acceptor while the nucleophilic portion of ADO acts as an electron-donor, causing intermolecular interaction with a focus on the reactive region. With the exception of coronene, all the complexes have negative Gibbs free energy changes due to ADO adsorption. Furthermore, enthalpy changes have low values for coronene complex (-5.18 kcal/mol) and large values for doped complexes (-255.56 to-284.61 kcal/mol). Our calculations demonstrate that the most stable complex among the other systems under study. Is the ADO with nitrogen parallel doped complex, with a binding energy of-284.13 kcal/mol. Other doped complexes have lower energies with the pristine coronene complex having the lowest value. The NH, NH2, C@O and ring modes of ADO possess more Raman intensity in the after adsorption and it is due to the enhancement mechanism due to SERS effect.(c) 2022 Elsevier B.V. All rights reserved.