transition structure

https://doi.org/10.1351/goldbook.T06471
A @C01145@ on a @P04780@. 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]