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Synthesis, kinetics, and mechanism for adduct formation of tetraaza Schiff base cobalt(II) complexes with diorganotin(IV)dichlorides in dimethylformamide solvent
Author(s) -
Asadi Mozaffar,
Asadi Zahra,
Mosalanezhad Fatemeh
Publication year - 2010
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.20499
Subject(s) - chemistry , adduct , cobalt , reaction rate constant , schiff base , medicinal chemistry , dimethylformamide , stability constants of complexes , kinetics , solvent , stereochemistry , inorganic chemistry , organic chemistry , aqueous solution , physics , quantum mechanics
The kinetics and mechanism of the adduct formation of diorganotin(IV)dichlorides with Co(II) tetraaza Schiff base complexes, such as [Co(ampen)] {[ N , N ′‐ethylenebis‐( o ‐amino‐α‐phenylbenzylideneiminato)cobalt(II)]}, [Co(campen)] {[ N , N ′‐ethylenebis‐(5‐chloro‐ o ‐amino‐α‐phenylbenzylideneiminato)cobalt(II)]}, and [Co(amaen)] {[ N , N ′‐ethylenebis‐( o ‐amino‐α‐methylbenzylideneiminato)cobalt(II)]}, were studied spectrophotometrically. The kinetic parameters and the rate constant values show the following acceptor tendency trend for the diorganotin(IV)dichlorides: Ph 2 SnCl 2 > Me 2 SnCl 2 > Bu 2 SnCl 2 . Adducts have been separately synthesized and fully characterized by 119 SnNMR, IR, UV–vis spectra, and elemental microanalysis (C,H,N) methods. The trend of the rate constants for the adduct formation of the cobalt complexes with a given tin acceptor decreases as follow: Co(amaen) > Co(ampen) > Co(campen). The linear plots of k obs vs. the molar concentration of the diorganotin(IV)dichlorides, the high span of the second‐order rate constant k 2 values, and the large negative values of AS ≠ suggest an associative (A) mechanism for the acceptor–donor adduct formation. © 2010 Wiley Periodicals, Inc. Int J Chem Kinet 42: 499–507, 2010