Iron(II)-bis (salicyladimine) Schiff-base complexes catalyzed decomposition of hydrogen peroxide

✍ Scribed by I. A. Salem; M. Y. El-Sheikh; A. B. Zaki; Ulrich Nickel

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 403 KB
• Volume: 26
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550260910

✦ Synopsis

The tetradentate Schiff-base ligands, N,"-bis(salicy1idene)-ethylenediamine (Salen), N,"-bis(salicy1idene) butylenediamine (Salbut), and N,N-bis(salicylidene)-o-phenylenediamine, (sal-o-phen) are very strongly sorbed by cation exchange resin (Dowex-50W) with Fez+ ions as a counter ion, forming stable complexes. The kinetics of the catalytic decomposition of H202 using these complexes was studied in ethanolic medium. The reaction was first-order with salen and sal-o-phen and second-order with salbut with respect to [HzOz]. The rate of the HzO2 decomposition increased either from salen to salbut or from salen to sal-o-phen. Also, the k (per g dry resin) values decreased with increasing both the particle size and the degree of resin cross-linkage. The active species formed at the beginning of the reaction, had an inhibiting effect on the reaction rate. The corresponding activation parameters were calculated from a least-squares fit of the temperature dependence of the rate constant. A reaction mechanism is proposed.