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|Title:||Ternary complexes of iron(III) with 1, 2-bis(2-hydroxybenzamido)ethane, thiocyanate and sulphur(IV): A kinetic study.|
Dash, Anadi C
|Abstract:||The kinetics of anation of (diaqua)(1,2-bis(2-hydroxybenzamido)iron(III) by NCS¯ and SIV (HSO3¯ and SO32- ) are reported at 25°C, I= 0.5 mol dm-3 in 20% (v/v) MeOH + H2O medium. The formation of the monothiocyanato complex, Fe(L)(OH2)(NCS), is reversible. The monosulphito complex, Fe(L)(OH2)(SO3)¯ is formed via the reaction of the diaqua complex with H SO3¯ and SO32 - ; dissoc iation of the sulphito complex to the reactants has not been observed. Ion-pairing of the diaqua complex with SO32 - (but not with HSO3¯) has been identified kinetically and resulted in the reduced reactivity of SO32 - in comparison to HSO3¯. The results are consistent with the dissociative mode of activation for the aqua ligand substitution of Fe(L)(OH2)2+. It has been found that there is no significant labilising action of the coordinated phenoxide and amide functions of the primary ligand (L2-) on the aqua ligand replacement reaction at iron(III) center.|
|Appears in Collections:||IJC-A Vol.41A(08) [August 2002]|
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