SOLVENT AND SUBSTITUENT EFFECTS IN THE FORMATION OF SCHIFF BASES.

K SIVARAM PRASAD, M C CHOWDARY

Abstract


The formation constants of the Schiff bases formed between salicylaldehyde and substituted anilines in water-methanol and water-dioxan mixutres of varying composition have  been determined spectrophotometrically.The formation constants of the bases except those formed with ortho-substituted anilines were found to decrease with the mole fraction of water in both the solvent media. A linear relationship was found between the log formation constants and the log dissociation constants of the conjugate acids of aniline studied. Here also the ortho-substituted anilines were found to be exceptions.


Keywords


Schiff base, formation constants, spectrophotometer, modified Job's method, saucy- aldehyde, solvent effect, substitutent effect.

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