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Iron(II)‐bis (salicyladimine) Schiff‐base complexes catalyzed decomposition of hydrogen peroxide
Author(s) -
Salem I. A.,
ElSheikh M. Y.,
Zaki A. B.,
Nickel Ulrich
Publication year - 1994
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550260910
Subject(s) - chemistry , schiff base , catalysis , ethylenediamine , hydrogen peroxide , decomposition , reaction rate constant , medicinal chemistry , kinetics , polymer chemistry , ion exchange resin , chemical decomposition , inorganic chemistry , nuclear chemistry , organic chemistry , physics , quantum mechanics
The tetradentate Schiff‐base ligands, N , N ′‐bis(salicylidene)‐ethylenediamine (Salen), N , N ′‐bis(salicylidene) butylenediamine (Salbut), and N , N ′‐bis(salicylidene)‐ o –phenylenediamine, (sal‐ o ‐phen) are very strongly sorbed by cation exchange resin (Dowex‐50W) with Fe 2+ ions as a counter ion, forming stable complexes. The kinetics of the catalytic decomposition of H 2 O 2 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 [H 2 O 2 ]. The rate of the H 2 O 2 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. © 1994 John Wiley & Sons, Inc.