OSCILLATORY REACTIONS IN THE LACTIC ACID/ACIDIC BROMATE SYSTEM WITH A TETRAAZAMACROCYCLIC NICKEL(II)COMPLEX AS CATALYST

摘要

New oscillating reactions with the participation of a tetraazamacrocyclic nickel (II)complex [NiL](ClO_4)_2 as catalyst in the lactic acid/acidic bromate system are reported.The ligand L in the complex is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene.The oscillating features are described,and the activation energy is found to be as low as 27.2 kJ/mol.Experimental results suggest that the brominating reaction may take place on pyruvic acid,the oxidized product of lactic acid.A tentative mechanism based on FKN is proposed.