Photochemistry and Photobiology · 1978 · 21 citations · 3 references
Pyridine DerivativesBiochemistryPhotochemistryNatural SciencesSpectroscopyMechanistic PhotochemistryInfrared SpectroscopyPyridine BasesSpectra-structure CorrelationOrganic ChemistryChemistrySupramolecular PhotochemistryPhotochemical Primary StepPhotophysical PropertyBiophysicsPigmentInfrared Study
Abstract— 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.
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