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A new experimental system of coupled chemical oscillators is presented. Three cation-exchange beads loaded with ferroin are spatially distributed in triangular forms and immersed in the Belousov–Zabotinsky reaction mixture. The cation-exchange beads were in no contact with each other. The cation-exchange bead was used as a chemical oscillator. Spontaneous switching between two out-of-phase oscillation was observed.

Spatiotemporal patterns of chemical wave propagation in the assemblies of nine cation-exchange beads loaded with the catalyst ferroin of Belousov–Zhabotinsky reaction are reported. The beads are immersed in the reaction mixture, on which periodic chemical waves are emerged. In the bead assemblies, abrupt changes of initiation site and direction of the periodic chemical waves were observed. In some cases, it was observed that transient oscillation cessations and the following rotating spiral wave occur.