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Title: Nonadiabatic Dynamics Simulation of the Wavelength-Dependent Photochemistry of Azobenzene Excited to the nπ* and ππ* Excited States

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.0c09056· OSTI ID:1779442

Azobenzene is one of the most ubiquitous photoswitches in photochemistry and a prototypical model for photoisomerizing systems. Despite this, its wavelength-dependent photochemistry has puzzled researchers for decades. Upon excitation to the higher energy ππ* excited state instead of the dipole-forbidden nπ* state, the quantum yield of isomerization from trans- to cis-azobenzene is halved. The difficulties associated with unambiguously resolving this effect both experimentally and theoretically have contributed to lasting controversies regarding the photochemistry of azobenzene. Here, we systematically characterize the dynamic photoreaction pathways of azobenzene by performing first-principles simulations of the nonadiabatic dynamics following excitation to both the ππ* and the nπ* states. In this work, we demonstrate that ground-state recovery is mediated by two distinct S1 decay pathways: a reactive twisting pathway and an unreactive planar pathway. Increased preference for the unreactive pathway upon ππ* excitation largely accounts for the wavelength-dependent behavior observed in azobenzene.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
N00014-18-1-2624; AC02-76SF00515
OSTI ID:
1779442
Journal Information:
Journal of the American Chemical Society, Vol. 142, Issue 49; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (55)

Further evidence for rotation in the π,π* and inversion in the n,π* photoisomerization of azobenzenes journal August 1984
Quantum Chemistry on Graphical Processing Units. 2. Direct Self-Consistent-Field (SCF) Implementation journal October 2009
Kasha's rule: a reappraisal journal January 2019
Femtosecond Time-Resolved Fluorescence Study of Photoisomerization of trans -Azobenzene journal September 2001
Light Switching of Molecules on Surfaces journal May 2009
Femtosecond/Picosecond Time-Resolved Spectroscopy of trans - Azobenzene: Isomerization Mechanism Following S 2 (ππ*) ← S 0 Photoexcitation journal May 2002
Hole–hole Tamm–Dancoff-approximated density functional theory: A highly efficient electronic structure method incorporating dynamic and static correlation journal July 2020
Picosecond Time-Resolved Raman Study of trans -Azobenzene journal May 2000
UV-Light-Induced Vibrational Coherences: The Key to Understand Kasha Rule Violation in trans -Azobenzene journal March 2018
Density-functional exchange-energy approximation with correct asymptotic behavior journal September 1988
Quantum Chemistry on Graphical Processing Units. 1. Strategies for Two-Electron Integral Evaluation journal January 2008
Simulation of the photodynamics of azobenzene on its first excited state: Comparison of full multiple spawning and surface hopping treatments journal December 2005
Fast photodynamics of azobenzene probed by scanning excited-state potential energy surfaces using slow spectroscopy journal January 2015
A perspective on the CASPT2 method journal April 2011
Excited-State Decay in the Photoisomerisation of Azobenzene: A New Balance between Mechanisms journal August 2016
On the Quantum Correction For Thermodynamic Equilibrium journal June 1932
Femtosecond time-resolved UV-visible absorption spectroscopy of trans-azobenzene: dependence on excitation wavelength journal June 1998
TeraChem : A graphical processing unit ‐accelerated electronic structure package for large‐scale ab initio molecular dynamics journal July 2020
Cis-trans photoisomerization of azobenzene. Solvent and triplet donors effects journal March 1979
A new mixing of Hartree–Fock and local density‐functional theories journal January 1993
Clocking transient chemical changes by ultrafast electron diffraction journal March 1997
Multiconfiguration second-order perturbation theory approach to strong electron correlation in chemistry and photochemistry: Multiconfiguration second-order perturbation theory
  • Roca-Sanjuán, Daniel; Aquilante, Francesco; Lindh, Roland
  • Wiley Interdisciplinary Reviews: Computational Molecular Science, Vol. 2, Issue 4 https://doi.org/10.1002/wcms.97
journal November 2011
Theoretical study on the photoisomerization of azobenzene journal October 2001
Molecular Switches and Motors on Surfaces journal April 2013
Fully optimized contracted Gaussian basis sets for atoms Li to Kr journal August 1992
On the rotation-inversion controversy on photoisomerization of azobenzenes. Experimental proof of inversion journal March 1982
Photoisomerization Dynamics and Pathways of trans - and cis -Azobenzene in Solution from Broadband Femtosecond Spectroscopies and Calculations journal July 2014
Reversible Photocontrol of Biological Systems by the Incorporation of Molecular Photoswitches journal April 2013
On the Mechanism of the cis−trans Isomerization in the Lowest Electronic States of Azobenzene:  S 0 , S 1 , and T 1 journal March 2004
Why Does trans -Azobenzene Have a Smaller Isomerization Yield for ππ* Excitation Than for nπ* Excitation? journal December 2008
Ultrafast dynamics and photochemistry of π-π* excited trans -azobenzene-a comprehensive analysis of resonance Raman intensities journal November 2008
The Different Photoisomerization Efficiency of Azobenzene in the Lowest nπ* and ππ* Singlets: The Role of a Phantom State journal April 2008
Features of the photochemically active state surfaces of azobenzene journal September 1982
Balanced basis sets of split valence, triple zeta valence and quadruple zeta valence quality for H to Rn: Design and assessment of accuracy journal January 2005
Imaging CF 3 I conical intersection and photodissociation dynamics with ultrafast electron diffraction journal July 2018
Mapping Atomic Motions with Ultrabright Electrons: The Chemists' Gedanken Experiment Enters the Lab Frame journal April 2014
Probing the π → π* photoisomerization mechanism of trans -azobenzene by multi-state ab initio on-the-fly trajectory dynamics simulations journal January 2018
Characterization of electronic transitions in complex molecules journal January 1950
Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density journal January 1988
Simultaneous observation of nuclear and electronic dynamics by ultrafast electron diffraction journal May 2020
The photochemical ring-opening of 1,3-cyclohexadiene imaged by ultrafast electron diffraction journal April 2019
Ab Initio Multiple Spawning:  Photochemistry from First Principles Quantum Molecular Dynamics journal June 2000
Cooperating Dinitrogen and Phenyl Rotations in trans- Azobenzene Photoisomerization journal June 2012
cis .dblharw. trans Photoisomerization of azobenzene-cyclodextrin inclusion complexes journal September 1987
Quantum Chemistry on Graphical Processing Units. 3. Analytical Energy Gradients, Geometry Optimization, and First Principles Molecular Dynamics journal August 2009
Ab initio molecular dynamics simulation of photoisomerization in azobenzene in the nπ[sup ∗] state journal January 2009
The Photoisomerization Mechanism of Azobenzene: A Semiclassical Simulation of Nonadiabatic Dynamics journal May 2004
Nonadiabatic molecular dynamics: Validation of the multiple spawning method for a multidimensional problem journal May 1998
Ab Initio Quantum Molecular Dynamics book January 2002
Mechanism and Dynamics of Azobenzene Photoisomerization journal July 2003
Multidimensional Potential Energy Surfaces Resolved at the RASPT2 Level for Accurate Photoinduced Isomerization Dynamics of Azobenzene journal October 2019
Femtosecond Time-Resolved UV−Visible Absorption Spectroscopy of trans -Azobenzene in Solution journal January 1996
How Does the Trans-Cis Photoisomerization of Azobenzene Take Place in Organic Solvents? journal March 2010
Excited-State Structure and Dynamics of cis - and trans -Azobenzene from Resonance Raman Intensity Analysis journal December 2007
Ab Initio Nonadiabatic Molecular Dynamics with Hole–Hole Tamm–Dancoff Approximated Density Functional Theory journal August 2020