Related Experiment Video
Updated: Feb 27, 2026

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
Published on: October 18, 2018
Vibrational spectroscopic study of vinyl substituted polycyclic aromatic hydrocarbons
Anju Maurya1, Shantanu Rastogi1
1Department of Physics, D.D.U. Gorakhpur University, Gorakhpur 273009, India.
Abstract:
The mid infrared emission features observed in various astrophysical sources are attributed to polycyclic aromatic hydrocarbon (PAH) molecules. The models of emission spectra from a collection of PAHs show uncertainty in matching the 6.2 μm feature. This indicates the need to consider a larger variety of PAHs and PAH derivatives. Chemical pathways towards formation of PAHs in the astrophysical environments involve vinyl substituted PAHs as intermediate products. Vibrational spectroscopic study of vinyl-PAHs is reported in the present work. The vinyl group is substituted at similar positions in eight different PAHs. The obtained optimized structures show that vinyl substitution at 2 position in acenes gives planar geometry, while all other vinyl-PAHs are non-planar. Infrared spectra is simulated for neutrals as well as for cations. The results are compared with the spectra of corresponding plain PAHs and analyzed for possible match with astrophysical observations. New features, due to vinyl group in the composite spectra, identified at 6.64, 6.92, 7.27, 8.77 and 10.35 μm fall close to some sub features of the observed emission spectra. The paper provides data that may be used in the emission models particularly along proto planetary nebulae type cool objects.
More Related Videos
Related Concept Videos
NMR Spectroscopy of Benzene Derivatives
IR and UV–Vis Spectroscopy of Aldehydes and Ketones
Mass Spectrometry: Aromatic Compound Fragmentation
NMR Spectroscopy of Aromatic Compounds
Aromatic Hydrocarbon Anions: Structural Overview
Due to the absence of continuous...
Nomenclature of Aromatic Compounds with a Single Substituent

