Abstract
Continuous wave and pulse NMR measurements were carried out on phenol derivatives containing t‐butyl groups [tri‐t‐butylphenol (TTBP), methylene‐bis(2,6‐di‐t‐butylphenol) (MBBP), and the galvinoxyl radical] to investigate the molecular motions of methyl and t‐butyl groups. From second moment measurements we distinguish three temperature regions characteristic of different forms of molecular motions. Between the rigid‐lattice limit (plateau region III) and plateau region I at high temperature where both methyl and t‐butyl motions are present, there appeared shoulders in the second moment curve. The shoulders in the second moments and relaxation minimum at low temperature are satisfactorily explained by the motional model which includes nonequivalent methyl motions; two methyls in each t‐butyl group at the ortho positions and all methyls in the t‐butyl group at the para positions are responsible for these phenomena, while one methyl motion in each t‐butyl group at the ortho positions and the entire motion o...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
