Salt effects on the reactivity of base hydrolysis of Fe(II) chelates [naphthylideneisoleucinate
(nili), naphthylideneleucinate (nli), naphthylideneserinate (nsi), salicylideneisoleucinate
(sili), salicylideneleucinate (sli), salicylidenemethioninate (smi), and
salicylidenetryptophanate (sti)] have been investigated in aqueous media containing alkali
metal halides and tetra-n-butylammonium bromide (TBAB). NaCl and NaBr exhibited different
reactivity trends from those of KBr and TBAB.
The observed patterns vary markedly with complex hydrophobicity. Generally, the presence
of the salt markedly enhances the rate compared to its absence. This behavior agrees with the
anionic nature of the transient species. With increasing added NaCl and NaBr, the rate of the
reaction decreases. The rate decreases and then increases on increasing the concentration of
KBr and TBAB.