Bromate−1,4-Cyclohexanedione−Ferroin Gas-Free Oscillating Reaction. 1. Basic Features and Crossing Wave Patterns in a Reaction−Diffusion System without Gel

We present a study of the bromate−1,4-cyclohexanedione−ferroin oscillating reaction in both well-stirred and reaction−diffusion systems. We investigate the dependence of the system dynamics on the initial reagent concentrations, with the initial concentration of ferroin varied from 0 to 5 × 10-3 M, and show that the system behaves like a typical BZ oscillator if the concentration of ferroin exceeds 5 × 10-5 M. We demonstrate spontaneous formation of spiral waves and transverse wave fronts in quasi-two-dimensional systems and formation of crossing wave patterns in thin layers of solution open to air.