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AN INFRARED STUDY OF THE BASICITY OF NON‐AROMATIC IMINES: RELATION TO VISUAL PIGMENTS
Author(s) -
Favrot J.,
Sandorfy C.,
Vocelle D.
Publication year - 1978
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1978.tb07707.x
Subject(s) - pyridine , chemistry , chloroform , infrared , infrared spectroscopy , hydrogen bond , schiff base , organic chemistry , molecule , polymer chemistry , physics , optics
— The knowledge of the basicity of non‐aromatic Schiff‐bases is important for the interpretation of the photochemical primary step of vision. In order to obtain an estimate of it, the infrared spectra in chloroform d solution of a number of aliphatic amines, pyridine derivatives and non‐aromatic Schiff‐ bases have been measured. From the known p K a values of the aliphatic and pyridine bases and the free‐associated frequency shift (Av) of the C—D. N hydrogen bonds, the p K a values for the Schiff‐bases were inferred. They range from 6 to 8. 5, less basic than aliphatic amines but somewhat more basic than pyridine bases.