Unexpected behaviors, so called exotic chemical phenomena can appear in nonlinear chemical systems under far from equilibrium conditions. Most interesting among them is the formation of periodic structures. The periodicity originated from chemistry emerges in two essential forms: (a) periodicity in time represented by the oscillatory chemical reactions; (b) periodicity in space resulting in chemical pattern formations.

The present lecture focuses on the oscillatory chemical reactions. Our research team has designed about three-quarter of the known liquid phase chemical oscillators: appr. 100 variants of 7 oscillatory families have been discovered and characterized. These systems are widely used as models in different laboratories to study dynamic behaviors, spatial pattern formations, chemical chaos, and for demonstration, chemical analysis, etc.

Formal analogy of chemical oscillations and related phenomena can be found in other field of sciences like in biology, geology, technology, social sciences, even in economy. The understanding of periodicity in chemistry (at molecular level) may contribute to clarifying similar but most complicated phenomena studied by other scientific disciplines.