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|Title:||Hydrogen bonding or transient coordination of pendant group: Cause for lability in ligand substitution reaction of aminopolycarboxylatoruthenium(III) complexes|
|Authors:||Khan, M M Taqui|
Bajaj, H C
|Abstract:||The rate of substitution of water molecule in [LRuIII(H2O)l complexes [L= ethylenediaminetetraacetate (EDTA) anion and N-hydroxyethylethylenediaminetriacetate (HEDTRA) anion] with CI- ion has been studied spectrophotometrically in aqueous medium at 30°C. The rates of substitutions of CI- in [LRuCI] with thiocyanate (SCN-) have also been studied as a function of SCN- concentration in the temperature range 30-50°C. In both the cases, ruthenium(III)-EDTA is found to be more reactive than the corresponding HEDTRA complex. Activation parameters H≠ and S≠ for the substitution of [LRuIIICI]- complexes with SCN- are determined and a suitable mechanism is proposed. The reactivity of [LRuIIICI]- towards SCN- substitution is discussed in terms of the transient coordination of the uncoordinated - COOH or -CH2 - OH pendant group which assists in the elimination of leaving group and ligation of substituting nucleophiles.|
|Appears in Collections:||IJC-A Vol.31A(03) [March 1992]|
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