title: Thermochemistry and UV spectroscopy of alkyl peroxynitrates.
abstract: High level ab initio calculations and multiconfigurational methods have been used to characterize the equilibrium structures, vibrational frequencies, enthalpies of formation, and UV-vis spectra of alkyl peroxynitrates R-OONO(2) (R = H, CH(3), C(2)H(5), C(3)H(7)). Excellent agreement with the experimental enthalpy of formation is obtained for HOONO(2) warranting similar accuracy for the rest of compounds for which values are inexistent or measured indirectly. The spectra obtained by MS-CASPT2/CASSCF calculations are very similar in all the species, showing a broad band below 200 nm with a shoulder due to pipi* transitions and a tail at approximately 250 nm due to weak npi* transitions on the NO(2) group.
authors: INIFTA, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, La Plata (1900), Argentina.
authors: Cristian
authors: C
authors: Buendía-Atencio
authors: Verónica
authors: V
authors: Leyva
authors: Leticia
authors: L
authors: González
mesh_terms: D003198:Computer Simulation; D008968:Molecular Conformation; D009566:Nitrates / Q000737:chemistry*; D011789:Quantum Theory; D013056:Spectrophotometry, Ultraviolet; D013237:Stereoisomerism; D013816:Thermodynamics
chemical_list: D009566:Nitrates; C039642:peroxynitric acid