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Carbon nanorings with inserted acenes: Breaking symmetry in excited state dynamics

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep31253· OSTI ID:1321781
 [1];  [1];  [2];  [1]
  1. Univ. Nacional de Quilmes/CONICET, Bernal (Argentina)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Conjugated cycloparaphenylene rings have unique electronic properties being the smallest segments of carbon nanotubes. Their conjugated backbones support delocalized electronic excitations, which dynamics is strongly influenced by cyclic geometry. Here we present a comparative theoretical study of the electronic and vibrational energy relaxation and redistribution in photoexcited cycloparaphenylene carbon nanorings with inserted naphthalene, anthracene, and tetracene units using non-adiabatic excited-state molecular dynamics simulations. Calculated excited state structures reflect modifications of optical selection rules and appearance of low-energy electronic states localized on the acenes due to gradual departure from a perfect circular symmetry. After photoexcitation, an ultrafast electronic energy relaxation to the lowest excited state is observed on the time scale of hundreds of femtoseconds in all molecules studied. Concomitantly, the efficiency of the exciton trapping in the acene raises when moving from naphthalene to anthracene and to tetracene, being negligible in naphthalene, and ~60% and 70% in anthracene and tetracene within the first 500 fs after photoexcitation. Observed photoinduced dynamics is further analyzed in details using induced molecular distortions, delocatization properties of participating electronic states and non-adiabatic coupling strengths. Lastly, our results provide a number of insights into design of cyclic molecular systems for electronic and light-harvesting applications.
Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1321781
Report Number(s):
LA-UR-16-24517
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Coherent exciton-vibrational dynamics and energy transfer in conjugated organics journal June 2018
Symmetry breaking and the turn-on fluorescence of small, highly strained carbon nanohoops journal January 2019
Strain-Promoted Reactivity of Alkyne-Containing Cycloparaphenylenes journal November 2018
Strain-Promoted Reactivity of Alkyne-Containing Cycloparaphenylenes journal November 2018
Exciton localization in excited-state dynamics of a tetracene trimer: a surface hopping LC-TDDFTB study journal January 2018
A diketopyrrolopyrrole-based macrocyclic conjugated molecule for organic electronics journal January 2019
Symmetry Breaking and the Turn-On Fluorescence of Small, Highly Strained Carbon Nanohoops journal January 2019
Symmetry Breaking and the Turn-On Fluorescence of Small, Highly Strained Carbon Nanohoops journal January 2019

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