DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Rehybridization dynamics into the pericyclic minimum of an electrocyclic reaction imaged in real-time

Journal Article · · Nature Communications
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [4];  [5];  [6]; ORCiD logo [7]; ORCiD logo [3]; ORCiD logo [8];  [3]; ORCiD logo [6];  [6]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [2]; ORCiD logo [3]
  1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Institute (PULSE); Stony Brook University, NY (United States)
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Institute (PULSE); Stanford University, CA (United States)
  3. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Institute (PULSE)
  4. Tsinghua University, Beijing (China)
  5. University of Nebraska, Lincoln, NE (United States); Harwell Science and Innovation Campus, Didcot (United Kingdom). Diamond Light Source
  6. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  7. University of Nebraska, Lincoln, NE (United States)
  8. 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

References (38)

GPU-Accelerated State-Averaged Complete Active Space Self-Consistent Field Interfaced with Ab Initio Multiple Spawning Unravels the Photodynamics of Provitamin D 3 journal June 2016
Generalized Gradient Approximation Made Simple journal October 1996
Imaging Molecular Motion: Femtosecond X-Ray Scattering of an Electrocyclic Chemical Reaction journal June 2015
Model calculations of photochemical reactivity journal January 1975
Imaging CF 3 I conical intersection and photodissociation dynamics with ultrafast electron diffraction journal July 2018
The Ultrafast Pathway of Photon-Induced Electrocyclic Ring-Opening Reactions: The Case of 1,3-Cyclohexadiene journal May 2011
Remarks on the specificities of the photochemical and thermal transformations in the vitamin D field journal January 1961
The photochemical ring-opening of 1,3-cyclohexadiene imaged by ultrafast electron diffraction journal April 2019
Ab initio multiple spawning simulations for "Rehybridization dynamics into the pericyclic minimum of an electrocyclic reaction imaged in real-time" dataset January 2023
The Conservation of Orbital Symmetry journal November 1969
Ultrafast Imaging of Molecules with Electron Diffraction journal April 2022
The influence of excited state topology on wavepacket delocalization in the relaxation of photoexcited polyatomic molecules journal December 2012
α-CASSCF: An Efficient, Empirical Correction for SA-CASSCF To Closely Approximate MS-CASPT2 Potential Energy Surfaces journal May 2017
Ab Initio Multiple Spawning:  Photochemistry from First Principles Quantum Molecular Dynamics journal June 2000
Quantum Chemistry on Graphical Processing Units. 1. Strategies for Two-Electron Integral Evaluation journal January 2008
The Transition State of the F + H2 Reaction journal December 1993
Quantum Chemistry on Graphical Processing Units. 3. Analytical Energy Gradients, Geometry Optimization, and First Principles Molecular Dynamics journal August 2009
Quantum-chemical interpretation of photo-induced electrocyclic reactions journal January 1968
On the ultrafast photo-induced dynamics of α-terpinene journal May 2016
Feshbach resonances in the exit channel of the F + CH3OH → HF + CH3O reaction observed using transition-state spectroscopy journal July 2017
Nonadiabatic molecular dynamics: Validation of the multiple spawning method for a multidimensional problem journal May 1998
Raw dataset for "Rehybridization dynamics into the pericyclic minimum of an electrocyclic reaction imaged in real-time" dataset January 2023
Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory journal July 2015
Ultrafast polyene dynamics: the ring opening of 1,3-cyclohexadiene derivatives journal January 2014
Femtosecond x-ray spectroscopy of an electrocyclic ring-opening reaction journal April 2017
An atomic orbital-based formulation of analytical gradients and nonadiabatic coupling vector elements for the state-averaged complete active space self-consistent field method on graphical processing units journal October 2015
A direct-compatible formulation of the coupled perturbed complete active space self-consistent field equations on graphical processing units journal May 2017
Reaction Path of a sub-200 fs Photochemical Electrocyclic Reaction journal May 2001
Conformer-specific photochemistry imaged in real space and time journal October 2021
The Validity of the "Diradical" Hypothesis: Direct Femtoscond Studies of the Transition-State Structures journal November 1994
Transition-State Spectroscopy of Cyclooctatetraene journal June 1996
Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction journal September 2019
Quantum Chemistry on Graphical Processing Units. 2. Direct Self-Consistent-Field Implementation journal March 2009
Symmetry control and photoinduced reactions journal October 1969
Photochemical Ring-Opening and Ground State Relaxation in α-Terpinene with Comparison to Provitamin D3 journal February 2013
Ultrafast ring-opening reactions: a comparison of α-terpinene, α-phellandrene, and 7-dehydrocholesterol with 1,3-cyclohexadiene journal January 2013
Raw dataset for "Rehybridization dynamics into the pericyclic minimum of an electrocyclic reaction imaged in real-time" dataset January 2023
Ab initio multiple spawning simulations for "Rehybridization dynamics into the pericyclic minimum of an electrocyclic reaction imaged in real-time" dataset January 2023