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Journal Article

Electronic spectra of nitroethylene


Barbatti,  Mario
Research Group Barbatti, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Borges Jr., I., Barbatti, M., Aquino, A. J. A., & Lischka, H. (2012). Electronic spectra of nitroethylene. International Journal of Quantum Chemistry, 112(4), 1225-1232. doi:10.1002/qua.23080.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-A3B0-1
A systematic study of the electronic excited states of nitroethylene (C2H3NO2) was carried out using the approximate coupled-cluster singles-and-doubles approach with the resolution of the identity (RI-CC2), the time dependent density functional theory with the CAMB3LYP functional (TDDFT/CAMB3LYP) and the DFT multireference configuration interaction (DFT/MRCI) method. Vertical transition energies and optical oscillator strengths were computed for a maximum of 20 singlet transitions. Semiclassical simulations of the ultraviolet (UV) spectra were performed at the RI-CC2 and DFT/MRCI levels. The main features in the UV spectrum were assigned to a weak n-π* transition, and two higher energy πCC+O−π* bands. These characteristics are common to molecules containing NO2 groups. Simulated spectra are in good agreement with the experimental spectrum. The energy of the bands in the DFT/MRCI simulation agrees quite well with the experiment, although it overestimates the band intensities. RI-CC2 produced intensities comparable to the experiment, but the bands were blue shifted. A strong πCC+O−π* band, not previously measured, was found in the 8–9 eV range.