Abstract
AbstractThe effects of protonation and hydrogen bonding in linear Schiff bases obtained from n‐butylamine with butyraldehyde, crotonaldehyde, sorbaldehyde and all‐trans‐retinal were studied by means of 15N and 13C NMR. The protonation‐induced chemical shifts (Δδ) are an order of magnitude larger for 15N than for 13C. For 15N, this effect was found to increase with the extent of conjugation, culminating in the retinylideneimine (Δδ = −146 ppm), which constitutes a model for the study of the structure of the Schiff base linkage in visual pigments and related systems. Theoretical calculations of protonation‐induced Δδ values based on MINDO/ 3 are in agreement with experimental results.
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.
