Structural analysis of dexrazoxane: Exploring tautomeric conformations

Structural analysis of dexrazoxane, as a cardioprotective agent, was done in this work by exploring formations of tautomeric conformations and investigating the corresponding effects. Density functional theory (DFT) calculations were performed to optimize the structures to evaluate their molecular and atomic descriptors. In addition to the original structure of dexrazoxane, eight tautomers were obtained with lower stability than the original compound. Movements of two hydrogen atoms in between nitrogen and oxygen atoms of heterocyclic ring put such significant effects. Moreover, electronic molecular orbital features showed effects of such tautomerism processes on distribution patterns and surfaces, in which evaluating the quadrupole coupling constants helped to show the role of atomic sites for resulting the features. As a consequence, the results indicated that the tautomeric formations could significantly change the features of dexrazoxane reminding the importance of carful medication of this drug for patients.

Structural analysis of an iron-assisted carbon monolayer for delivery of 2-thiouracil

An idea of employing an iron-assisted carbon (FeC) monolayer for delivery of 2-thiouracil (2TU) was examined in this work by analyzing structural features for singular and bimolecular models. Density functional theory (DFT) calculations were performed for optimizing the structures and evaluating molecular and atomic descriptors for analyzing the models systems. Two bimolecular models were obtained assigning by S-FeC and O-FeC models, in which each of S and O atom of 2TU was relaxed towards the Fe region of FeC surface in the mentioned models, respectively. The results indicated that both models were achievable with slightly more favorability for formation of S-FeC model. The obtained molecular orbital properties revealed the dominant role of FeC monolayer for managing future interactions of attached 2TU, which is indeed a major role for employing nanomaterials for targeted drug delivery purposes. In addition to energies and molecular orbital features, atomic quadrupole coupling constants indicated the benefit of employing FeC monolayer for drug delivery of 2TU.

Investigating Functionalization Impacts on Structural Features of Barbituric Acid Derivatives: DFT Approach

Density functional theory (DFT) calculations were performed to investigate electronic and structural properties of barbituric acid (BA) and sixtheen of its derivatives to show impacts of structural functionalization on the features of parent BA. The models were optimized and the minimum energy structures were confirmed by frequency calculations. Molecular and atomic descriptors were evaluated for the optimized models, in which the results of formation binding strength and molecular orbital features indicated significance of such functionalization processes on the observed properties. The highest occupied and the lowest unoccupied molecular orbitals (HOMO and LUMO) and their related parameters all indicated magnitudes of changes from one molecule to another one. Furthermore, atomic scale quadrupole coupling constants (Cq) were evaluated for the nitrogen and oxygen atoms of BA compounds showing significance of structural functionalization impacts on the atomic properties of parent BA. As a consequence, such structural analyses of BA compounds could show their characteristic features for further developments especially for their efficient pharmaceutical applications.

Structural Analyses of Vanillin Derivative Compounds and their Molecular Docking with MPro and RdRp Enzymes of COVID-19

In this work, structural analyses of vanillin (Vanl) and eleven of its derivatives based on the modification of the aldehyde group were investigated using density functional theory (DFT) calculations. In this regard, molecular orbital features and atomic-scale quadrupole coupling constants were evaluated for geometrically optimized structures to see the impact of structural modification on the whole structure. The results indicated that the main impact of such modification was significant only for the modification region, whereas the impact on the rest of the structure was almost negligible. However, electronic features indicated a different tendency for Vanl derivatives for involving in interaction with enzymatic targets. Because of the importance of innovating medication for COVID-19, main protease (MPro) and RNA-dependent RNA polymerase (RdRp) were chosen for the enzymatic target of Vanl ligands for the formation of ligand-target complexes through performing molecular docking (MD) simulations. The results indicated that among the complexes, Vanl 9 (–NHNH2) and 11 (–CH2Cl) could work as the best ligands for interacting with each of RdRp and MPro, respectively. Consequently, optimization of Vanl derivatives could help innovate new compounds for the possible medication of the COVID-19 pandemic.