Activated Complex

An activated complex, also known as a transition state, is a temporary arrangement of atoms during a chemical reaction where bonds are partially broken and formed. It represents the highest energy point along the reaction pathway. Think of it as a fleeting "hinge" position that molecules pass through when transforming from reactants to products. This complex exists only briefly, and overcoming its energy barrier allows the reaction to proceed. Its stability and energy determine how quickly a reaction occurs. Understanding the activated complex helps chemists predict reaction rates and mechanisms.