Article (Scientific journals)
Selective bond formation triggered by short optical pulses: quantum dynamics of a four-center ring closure
Valentini, Alessio; van den Wildenberg, Stéphan; Remacle, Françoise
2020In Physical Chemistry Chemical Physics, 22 (39), p. 22302-22313
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Abstract :
[en] We report bond formation induced by an ultrashort UV pulse. The photochemical process is described by quantum dynamics as coherent electronic and nuclear motions during the ultrashort pulse induced ring closure of norbornadiene to quadricyclane. Norbornadiene consists of two ethylene moieties connected by a rigid (CH2)3 bridge. Upon photoexcitation, two new sigma bonds are formed, resulting in the closure of a four-atom ring. As a medium-sized polyatomic molecule, norbornadiene exhibits a high density of strongly coupled electronic states from about 6 eV above the ground state. We report on inducing the formation of the new bonds using a short femtosecond UV pulse to pump a non-equilibrium electronic density in the open form that evolves towards the closed ring form. As the coherent electronic-nuclear coupled dynamics unfold, the excited states change character through non-adiabatic interactions and become valence states for the two new C–C bonds of quadricyclane. Our three-dimensional fully quantum dynamical grid simulations during the first 200 fs show that short UV pulses of different polarization initiate markedly different initial non-equilibrium electronic densities that follow different dynamical paths to the S0/S1 conical intersection. They lead to different initial relative yields of quadricyclane, thereby opening the way to controlling bond-making with attopulses.
Research center :
MolSys - Molecular Systems - ULiège
Disciplines :
Chemistry
Author, co-author :
Valentini, Alessio
van den Wildenberg, Stéphan ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de chimie physique théorique
Remacle, Françoise  ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de chimie physique théorique
Language :
English
Title :
Selective bond formation triggered by short optical pulses: quantum dynamics of a four-center ring closure
Publication date :
2020
Journal title :
Physical Chemistry Chemical Physics
ISSN :
1463-9076
eISSN :
1463-9084
Publisher :
Royal Society of Chemistry, United Kingdom
Volume :
22
Issue :
39
Pages :
22302-22313
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Ultrafast Photoinduced Bond Making
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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since 26 January 2021

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