Abstract
Molecular geometries, nucleus independent chemical shifts, electronic, infrared and Raman spectra, vertical ionization energy and electron affinity, dipole moment, and electronic polarizabilities of 3-nitro-6-aza- benzo(a)pyrene and its N-oxide derivative were calculated for the gas phase using semiempirical and density functional theory. The influence of the N-oxidation on structural, elec- tronic, and spectroscopic properties is discussed. The infrared spectral region around 1,300 cm -1 involving the azabenzene N-O and the NO2 stretching vibrations is potentially useful to distinguish 3-nitro-6-azabenzo(a)pyrene from its N-oxide derivative. The calculated vertical ionization energy for 3-nitro-6-azabenzo(a)pyrene N-oxide is smaller than that of its parent compound, whereas the vertical electron affinity is higher in agreement with the experimental electrochemical reduction potentials. Both dipole moment and polarizability increase on passing from 3-nitro-6-azabenzo(a)pyrene to its N-oxide derivative, the contribution from the N-O bond formation being substantial. The electric property enhance- ments are explained through atomic charges and spectral shifts. Present results support the higher mutagenic activity for the N-oxide derivative in comparison with its parent compound. Keywords 3-Nitro-6-azabenzo(a)pyrene � 3-Nitro-6-azabenzo(a)pyrene N-oxide � Nitro-polycyclic aromatic hydrocarbons � Mutagenic activityDFT calculations
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.