New B-Z Oscillating Reactions Involving a Tetraazamacrocyclic Nickel(II) Complex

Abstract

New Belousov-Zhabotinskii reactions using a tetraazamacrocyclic nickel
complex as catalyst in NaBrO₃-pyruvic acid-H₂SO₄ system have been
investigated. This complex contains unsaturated macrocyclic ligand 11,13-
dimethyl-1,4, 7,10-tetraazacyclotrideca-1, 10, 12-triene. The concentration
oscillations of this system are damped rapidly due to the consumption of
the catalyst. Acrylonitrile, H₂O₂, vitamin C, glucose or CCl₄ present in
the system can inhibit the oscillations. Unlike the classical B-Z oscillating
system, variations in the initial concentrations of the components markedly
affect the potentiometric oscillation parameters and the shapes of the oscillations.