On December 15, 2021, Nair, K. P. Rajappan; Herbers, Sven; Grabow, Jens-Uwe; Nguyen, Ha Vinh Lam published an article.Electric Literature of 452-75-5 The title of the article was Neighborhood matters: Steric effects on methyl internal rotation and chlorine nuclear quadrupole coupling in 2-fluoro-4-chlorotoluene. And the article contained the following:
The rotational spectrum of 2-fluoro-4-chlorotoluene was studied in the frequency range 4 to 24 GHz by Fourier transform microwave spectroscopy. Fine torsional splittings into doublets were found for all rotational transitions due to Me internal rotation hindered with a barrier of about 230 cm-1. In combination with the quadrupole coupling hyperfine splittings on the same order of magnitude originating from the chlorine nucleus, rich spectral features were observed Rotational and quadrupole coupling constants for the 35Cl and 37Cl isotopologues studied in natural abundance were precisely determined Results from the experiment were supported by quantum chem. calculations at several levels of theory for the rotational constants and by Bailey’s semi-exptl. method for the quadrupole coupling constants The χcc quadrupole coupling tensor element and the barrier to Me internal rotation were compared with those of other halogen-substituted toluene derivatives The experimental process involved the reaction of 4-Chloro-2-fluorotoluene(cas: 452-75-5).Electric Literature of 452-75-5
The Article related to fluoro chlorotoluene internal rotation nuclear quadrupole coupling, Physical Organic Chemistry: Absorption, Emission, Reflection, and Scattering Spectra (Ultraviolet and Visible, Infrared and Fourier Transform Infrared, Raman, Microwave, Photoelectron, Fluorescence, Phosphorescence, etc.) and other aspects.Electric Literature of 452-75-5
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics