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Kinetics and mechanism of adducts formation of tetraaza cobalt(II) complexes with some organic bases in DMF solvent

✍ Scribed by Mozaffar Asadi; Zahra Asadi

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
218 KB
Volume
39
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The kinetics and mechanism of the adduct formation of two Co(II) tetraaza complexes, [Co(ampen)] {[(N,N′‐ethylenebis‐(o‐amino‐α‐phenylbenzylideneiminato)cobalt(II)]} and [Co(campen)] {[(N,N′‐ethylenebis‐(5‐chloro‐o‐amino‐α‐phenylbenzylideneiminato)cobalt(II)]}, with four organic bases, 4‐nitro imidazole (4‐NO~2~Imid), 4‐methyl imidazole (4‐MeImid), imidazole (Imid), and 1‐methyl imidazole (1‐MeImid), in DMF were studied spectrophotometrically. The kinetic parameters and the second‐order k~2~ rate constants show the following nucleophilicity trend of the bases toward the given substrate: 4‐NO~2~Imid > 4‐MeImid > Imid > 1‐MeImid. The linear plots of k~obs~ vs. the molar concentration of the base, the high span of k~2~ values, and the large negative values of Δ__S__^≠^ suggest an associative (A) mechanism. © 2007 Wiley Periodicals, Inc. 39: 137–144, 2007

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