transition structure

https://doi.org/10.1351/goldbook.T06471
A saddle point on a potential-energy (reaction) surface. It has one negative force constant in the harmonic force constant matrix.
See also: activated complex, transition state
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1174 [Terms] [Paper]
Citation: 'transition structure' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.T06471 RIS BibTex EndNote
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