Rehybridization dynamics into the pericyclic minimum of an electrocyclic reaction imaged in real-time
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Institute (PULSE); Stony Brook University, NY (United States)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Institute (PULSE); Stanford University, CA (United States)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Institute (PULSE)
- Tsinghua University, Beijing (China)
- University of Nebraska, Lincoln, NE (United States); Harwell Science and Innovation Campus, Didcot (United Kingdom). Diamond Light Source
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- University of Nebraska, Lincoln, NE (United States)
- Stanford University, CA (United States)
Electrocyclic reactions are characterized by the concerted formation and cleavage of both σ and π bonds through a cyclic structure. This structure is known as a pericyclic transition state for thermal reactions and a pericyclic minimum in the excited state for photochemical reactions. However, the structure of the pericyclic geometry has yet to be observed experimentally. We use a combination of ultrafast electron diffraction and excited state wavepacket simulations to image structural dynamics through the pericyclic minimum of a photochemical electrocyclic ring-opening reaction in the molecule α-terpinene. The structural motion into the pericyclic minimum is dominated by rehybridization of two carbon atoms, which is required for the transformation from two to three conjugated π bonds. The σ bond dissociation largely happens after internal conversion from the pericyclic minimum to the electronic ground state. These findings may be transferrable to electrocyclic reactions in general.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC02-76SF00515; AC02-05CH11231; AC52-07NA27344; SC0014170
- OSTI ID:
- 1974288
- Alternate ID(s):
- OSTI ID: 1971639; OSTI ID: 1984753
- Report Number(s):
- LLNL-JRNL-848870; TRN: US2313585
- Journal Information:
- Nature Communications, Vol. 14, Issue 1; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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