We analysed the photooxidation reaction in the electro-(1O2) and nucleophilic (O2•−) reaction of 2-pyridone azo derivatives. First, we calculated the energy (enthalpies) of tautomers formation, which is a measure of d...We analysed the photooxidation reaction in the electro-(1O2) and nucleophilic (O2•−) reaction of 2-pyridone azo derivatives. First, we calculated the energy (enthalpies) of tautomers formation, which is a measure of durability and the probability of their formation. We performed the light fastness calculations of the monoazopyridone dyes. Using the semi-empirical methods of quantum chemistry AM1 and PM3, the reactivity indicators of superdelocalisability (SrE(N)) and the electron density distribution in ground state on the highest occupied HOMO orbital and the lowest unoccupied excited state LUMO in 2-pyridone phenylazo derivatives were calculated. Superdelocalisability coefficients enable the stability to oxidising agents of various chemical molecules depending on the tautomeric forms in which they may occur. The results of the electron density calculations at the HOMO and LUMO boundary orbitals allow to determine the tendency to electrophilic attack with singlet oxygen 1O2 or nucleophilic attack of the superoxide anion O2•−on a specific atom in the molecule. The structure of the dyes was optimised with MM+, MD and AM1 or PM3 until a constant energy value was achieved with a convergence criterion of 0.01 kcal/mol.展开更多
One-carbon unit transfer reaction of imidazolinium with 1,2-diaminobenzene has been studied with semi-empirical molecular orbital calculations, PM3. The result shows that there are two ways to complete this reaction b...One-carbon unit transfer reaction of imidazolinium with 1,2-diaminobenzene has been studied with semi-empirical molecular orbital calculations, PM3. The result shows that there are two ways to complete this reaction because the imidazolinium ring has two different breaking patterns. These two ways both have seven steps, including two proton-migrating steps that limit the rate of the reaction. The structures and energies of the intermediates and transition states have been calculated.展开更多
PM3 method has been used to calculate a series of molecule’s electronic structures of Pyrrole,the relation between molecule’s electronic structures and insecticidal activities have been discussed.
PM3 SCF calculations have been carried out to study the thermolyses of o-acetylcycolpentanone and o-acetylcyclohexanone. The results obtained show that these two com-pounds are thermally decomiposed into products thro...PM3 SCF calculations have been carried out to study the thermolyses of o-acetylcycolpentanone and o-acetylcyclohexanone. The results obtained show that these two com-pounds are thermally decomiposed into products through an unimolecular elimination involving six-center cyclic transition state, and these two thermolyses are caused by the migration of posi-tive charged β-H.展开更多
文摘We analysed the photooxidation reaction in the electro-(1O2) and nucleophilic (O2•−) reaction of 2-pyridone azo derivatives. First, we calculated the energy (enthalpies) of tautomers formation, which is a measure of durability and the probability of their formation. We performed the light fastness calculations of the monoazopyridone dyes. Using the semi-empirical methods of quantum chemistry AM1 and PM3, the reactivity indicators of superdelocalisability (SrE(N)) and the electron density distribution in ground state on the highest occupied HOMO orbital and the lowest unoccupied excited state LUMO in 2-pyridone phenylazo derivatives were calculated. Superdelocalisability coefficients enable the stability to oxidising agents of various chemical molecules depending on the tautomeric forms in which they may occur. The results of the electron density calculations at the HOMO and LUMO boundary orbitals allow to determine the tendency to electrophilic attack with singlet oxygen 1O2 or nucleophilic attack of the superoxide anion O2•−on a specific atom in the molecule. The structure of the dyes was optimised with MM+, MD and AM1 or PM3 until a constant energy value was achieved with a convergence criterion of 0.01 kcal/mol.
文摘One-carbon unit transfer reaction of imidazolinium with 1,2-diaminobenzene has been studied with semi-empirical molecular orbital calculations, PM3. The result shows that there are two ways to complete this reaction because the imidazolinium ring has two different breaking patterns. These two ways both have seven steps, including two proton-migrating steps that limit the rate of the reaction. The structures and energies of the intermediates and transition states have been calculated.
文摘PM3 method has been used to calculate a series of molecule’s electronic structures of Pyrrole,the relation between molecule’s electronic structures and insecticidal activities have been discussed.
文摘PM3 SCF calculations have been carried out to study the thermolyses of o-acetylcycolpentanone and o-acetylcyclohexanone. The results obtained show that these two com-pounds are thermally decomiposed into products through an unimolecular elimination involving six-center cyclic transition state, and these two thermolyses are caused by the migration of posi-tive charged β-H.
