Electronic spectrophotometry has been employed to study the mechanism of transimination in bis(N-alkylsalicylaldiminato)nickel(II) complexes (alkyl = Me, Et, Pr(i), Pr(n) or Bu(n)) by ammonium ion in acetonitrile. The reaction is clearly biphasic: fast addition of ammonium and slow elimination of alkylammonium ions. The addition reaction involving the two azomethine bonds of the complex occurs by two consecutive processes and a two-term rate law was found for R = Bu(n). In the successive elimination reaction only one rate constant was observed which depends on the pK(a) and steric strain of the leaving alkylammonium ions.

Mechanistic study of the transimination of bis(N-alkylsalicylaldiminato)nickel(II) with ammonium ion in acetonitrile

CARBONARO, LAURA;
1992

Abstract

Electronic spectrophotometry has been employed to study the mechanism of transimination in bis(N-alkylsalicylaldiminato)nickel(II) complexes (alkyl = Me, Et, Pr(i), Pr(n) or Bu(n)) by ammonium ion in acetonitrile. The reaction is clearly biphasic: fast addition of ammonium and slow elimination of alkylammonium ions. The addition reaction involving the two azomethine bonds of the complex occurs by two consecutive processes and a two-term rate law was found for R = Bu(n). In the successive elimination reaction only one rate constant was observed which depends on the pK(a) and steric strain of the leaving alkylammonium ions.
Carbonaro, Laura; Giacomelli, A.; Isola, M.; Senatore, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/17716
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