Tribochemically active chelate complexes of salicylideneimines
N-Alkylsalicylideneimines and their complexes with 3d metals were obtained by chemical (from metal salts) and electrochemical methods (from metals in the zero oxidation state). The compounds obtained were characterized by IR and 1H NMR spectros
Mechanism of Formation of Schiff Base Complexes. Part 3. Kinetic Template Effect of Copper(II) in the Condensation Reaction of the Salicylaldehydato-ion with a Polyfunctional Diprimary Amine
Under suitable experimental conditions the reaction of the salicylaldehydato-ion (sal) with diethylenetriamine (dien) in the presence of copper(II) takes place trough a first-order kinetic process.The reactants are envisaged as being first co-ordinated to the copper(II), forming a labile ternary complex; interligand condensation is then supposed to occur within the co-ordination sphere of the metal.In the resulting reaction sequence the metal ion functions as a rudimentary enzyme.The dramatic difference between the activity if an ideal enzyme system, which reduces the order of a reaction by one unit through the rapid formation of ternarycomplex, and that of the copper(II) ion, which through an analogous mechanism promotes the reaction of sal and dien, is interpreted on the basis of a perturbation from the optimum reaction geometry of the reactants by the co-ordination of the functional groups to the metal.
Rotondo, Enrico,Priolo, Francesca Cusmano
p. 1825 - 1828
(2007/10/02)
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