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Oscillatory chemical reactions are exemplified by the Belousov- Zhabotinskii (BZ) reaction. A new type of structurally ordered chemical oscillator is reported: the BZ reactor-Langmuir monolayer coupled system (see Figure), where the monolayer contains Ru(bpy)32⊕ (bpy is bipyridyl), which luminesces. The preparation and spatio-temporal properties of this system are described.