Related Experiment Video
Updated: Nov 19, 2025

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
A SA-CASSCF and MS-CASPT2 study on the electronic structure of nitrosobenzene and its relation to its dissociation
Juan Soto1, Daniel Peláez2, Juan C Otero3
1Department of Physical Chemistry, Faculty of Science, University of Málaga, Andalucía Tech., E-29071 Málaga, SpainInstitut des Sciences Moléculaires d'Orsay (ISMO) - UMR 8214, Université Paris-Saclay, 91405 Orsay Cedex, France.
Abstract:
The photodissociation channels of nitrosobenzene (PhNO) induced by a 255 nm photolytic wavelength have been studied using the complete active space self-consistent method and the multistate second-order multiconfigurational perturbation theory. It is found that there exists a triplet route for photodissociation of the molecule. The reaction mechanism consists of a complex cascade of nonadiabatic electronic transitions involving triple and double conical intersections as well as intersystem crossing. Several of the relevant states (S2, S4, and S5 states) correspond to double excitations. It is worth noting that the last step of the photodissociation implies an internal conversion process. The experimentally observed velocity pattern of the NO fragment is a signature of such a conical intersection.
Related Concept Videos
Electrophilic Aromatic Substitution: Nitration of Benzene
NMR Spectroscopy of Benzene Derivatives
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Structure of Benzene: Molecular Orbital Model
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H
Resonance

