Computational study of chemical properties of Captopril drug and the connected form to Fullerene (C60) as a medicine nano carrier

Document Type : Research Paper

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Abstract

In this research at the first, captopril drug (CA) and its fullerene connected form (FCA) were
optimized. Natural Bond Orbital (NBO) calculations for these compounds were carried out at the
B3LYP/6-31G quantum chemistry level, in the gas phase and the liquid phase. These calculations can
be performed at different accuracy levels depending on the aim of the theoretical study [1]. For
instance, Density Functional Theory (DFT) can be used to calculate an accurate electronic structure,
HOMO and LUMO energies, Mulliken charge of atoms, energetic_orbital levels, chemical hardness,
chemical potential and electrophilicity of systems, and finally chemical, physical, biological,
pharmacological and industrial of fullerene and fullerene derivatives [4–7]. Theoretical calculations
such as NBO are very important to understand the pathways of electron transfer in assemblies.
Consequently, the obtained results showed that energy orbital levels decreased considerably by
linking structure of Captopril to structure of fullerene C60. In the study some other characteristics
such as chemical potential, chemical hardness, electrophilicity in these structures; it was found that
they changed considerably. These changes show dependency of the results, on power of electron
affinity of C60. In another part, the valence electrons populations for carbons, nitrogen, oxygens and
hydrogens atoms in similar position for FCA and CA were compared. Finally the data were compared
and discussed.

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