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EFFECT OF SOLUTION ENVIRONMENT ON THE ABSORPTION MAXIMA OF SCHIFF BASES OF RETINAL *
Author(s) -
BLATZ P. E.,
JOHNSON R. H.,
MOHLER J. H.,
AlDILAIMI S. K.,
DEWHURST S.,
ERICKSON J. O.
Publication year - 1971
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.1751-1097.1971.tb06109.x
Subject(s) - aqueous solution , chemistry , solvent , absorption (acoustics) , absorption spectroscopy , logarithm , maxima , photochemistry , analytical chemistry (journal) , chromatography , organic chemistry , materials science , optics , mathematics , mathematical analysis , physics , composite material , art , performance art , art history
— –Preliminary examination of the effect of solution environment on the electronic absorption spectrum of N‐retinylidene‐n‐butylamine(I) is reported. It is established that small amounts of CO 2 dissolved in certain solvents cause the formation of the conjugate acid of I. This reaction is shown to be dependent on temperature and the concentration of CO 2 . The pK b of I in aqueous buffer was measured spectrophotometrically and found to be 8.71. Salts of I were prepared in a number of ways and their spectra were determined in selected solvents. The Λ max varies with method of preparation, and only one method gives reproducible results. The Λ mnx is a function of the solvent in which the spectrum is determined. It was also found that the absorption maximum in wavenumbers is proportional to the negative logarithm of acid concentration.