2-Mercaptobenzoxazole pentacyanoferrate(II/III) complexes—kinetics of formation, substitution and the thermodynamic cycle

The formation of an antitubercular complex [Fe(CN)5(INH)]3− through mercury(II)‐catalyzed ligand substitution reaction: A kinetic and mechanistic study

“…3− ion [3][4][5][6]. The kinetic, thermodynamic, and volume of activation data from numerous mechanistic studies are consistent with a dissociative mechanism for ligand substitution reactions in these complexes [7,8].…”

“…However, the subject is still given considerable attention because of its fundamental importance in analytical and synthetic chemistry. An extensive series of complexes, substituted with N‐, O‐, S‐, and P‐donor ligands L n + have been synthesized from labile [Fe(CN) 5 H 2 O] 3− ion 3–6. The kinetic, thermodynamic, and volume of activation data from numerous mechanistic studies are consistent with a dissociative mechanism for ligand substitution reactions in these complexes 7,8.…”

“…[32]. The well-known complex has been fully characterized as Na 3 [Fe(CN) 5 (INH)]·4H 2 O using elemental analysis, nuclear magnetic resonance, UV-visible, Mössbauer spectroscopy, and cyclic voltametric studies [33]. The UV-visible spectrum of the complex Na 3 [Fe(CN) 5 …”

“…Ionic strength >0.3 M was not studied due to the limited solubility of KNO 3 . The results indicated that the initial rate decreases with increasing ionic strength of the reaction medium, confirming a negative salt effect on the rate of the reaction.…”