TD-DFT, NBO, AIM, RDG and Thermodynamic Studies of Interactions of 5-Fluorouracil Drug with Pristine and P-doped Al12N12 Nanocage

Abstract

In the present study, the capability of the pristine and P-doped Al12N12 nanocage to deliver and detect of 5-Fluorouracil (5-FU) anticancer drug are investigated using the density functional theory (DFT) at the cam-B3LYP/6-31G(d, P) level of theory. The adsorption energy, thermodynamic parameters, natural bond orbital (NBO), atom in molecule theory (AIM), quantum parameters, reduced density gradient (RDG) and UV-visible spectrum for all selected models are calculated and results are analyzed. The values of adsorption energy (Eads) and thermodynamic parameters (ΔG and ΔH) for 5-FU@Al12N12 and 5-FU@Al12N11P complexes are negative and obtained results reveal that all adsorption processes are spontaneous and suitable to make a delivery of drug. The ΔΔG(sol) values of the all studied systems in the presence of water and ethanol solvent are positive and this property is favourable to shooting drug in biological system. The AIM, RDG, NBO calculated results indicate that the interaction between 5-FU drug and Al12N12 nanocage is weak covalent or strong electrostatic type. The bandgap energy of the 5-FU/Al12N12 nanocage complex alters slightly from original values, and so the pristine and P doped Al12N12 nanocage is not an excellent candidate for making a sensitive sensor for the 5-FU drug.