quantum-chemical calculations

The optimal geometric structure and reactivity of some peroxyacids, acridine and products of their interaction were calculated by quantum-chemical methods. It was found that the heat of formation of peroxyacids (PA) and carboxylic acids (CA) grow with increasing length of a hydrocarbon radical. The dependencies of the area of PA and molecules of CA on the number of carbon atoms in the molecules are linear. The potentials of ionization of all studied PA are close and lie within the range of 11.22–11.39 eV depending on the calculation methods.

The synthesis of new hybrids 1,3,4-oxadiazol-2-thione with acridine 9(10H)-one is carried out. Their structure is confirmed by LC-MS, IR-, 1H and 13C NMR-spectroscopy. The thione-thiol equilibrium was investigated in eight solvents with different relative permittivity with the help of UV-spectroscopy and quantum chemistry methods using DFT/B3LYP and HF bases. The results of the experimental calculations are in agreement with theoretical ones and have shown the prevalence of the thione.

The reactivity of different α-alkylacroleins has been described by semi-empirical quantum chemistry methods, their optimal geometric structure has been determined and heat of formation, as well as dipole moments of the molecules have been calculated. Theoretically calculated α-alkylacrolein parameters are in a good agreement with the experimental data presented in the literature for these compounds.

Interaction of an order of aminoanthraquinones with benzoylisothiocyanate resulting in the formation of new N-benzoyl-N’-(9,10-dioxo-9,10-dihydroanthacen-1-yl)-thioureas was investigated. Quantum-chemical calculations using Gaussian 03W and HyperChem 8 were carried out. On their basis nucleophilic addition of aminoanthraquinones to benzoylisothiocyanate (charge control) was confirmed. A probable mechanism of nucleophilic addition was suggested. Influence of ortho-substituents on the passing of the reaction was explained.