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Gong JQ, Favereau L, Anderson HL, et al. Breaking the Symmetry in Molecular Nanorings. J Phys Chem Lett. 2016;7(2):332-8doi: 10.1021/acs.jpclett.5b02617.
Gong, J. Q., Favereau, L., Anderson, H. L., & Herz, L. M. (2016). Breaking the Symmetry in Molecular Nanorings. The journal of physical chemistry letters, 7(2), 332-8. https://doi.org/10.1021/acs.jpclett.5b02617
Gong, Juliane Q, et al. "Breaking the Symmetry in Molecular Nanorings." The journal of physical chemistry letters vol. 7,2 (2016): 332-8. doi: https://doi.org/10.1021/acs.jpclett.5b02617
Gong JQ, Favereau L, Anderson HL, Herz LM. Breaking the Symmetry in Molecular Nanorings. J Phys Chem Lett. 2016 Jan 21;7(2):332-8. doi: 10.1021/acs.jpclett.5b02617. Epub 2016 Jan 08. PMID: 26735906; PMCID: PMC4745607.
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J Phys Chem Lett. 2016 Jan 21;7(2):332-8. doi: 10.1021/acs.jpclett.5b02617. Epub 2016 Jan 08.

Breaking the Symmetry in Molecular Nanorings.

The journal of physical chemistry letters

Juliane Q Gong, Ludovic Favereau, Harry L Anderson, Laura M Herz

Affiliations

  1. Department of Physics, Clarendon Laboratory, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom.
  2. Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Oxford OX1 3TA, United Kingdom.

PMID: 26735906 PMCID: PMC4745607 DOI: 10.1021/acs.jpclett.5b02617

Abstract

Because of their unique electronic properties, cyclic molecular structures ranging from benzene to natural light-harvesting complexes have received much attention. Rigid π-conjugated templated porphyrin nanorings serve as excellent model systems here because they possess well-defined structures that can readily be controlled and because they support highly delocalized excitations. In this study, we have deliberately modified a series of six-porphyrin nanorings to examine the impact of lowering the rotational symmetry on their photophysical properties. We reveal that as symmetry distortions increase in severity along the series of structures, spectral changes and an enhancement of radiative emission strength occur, which derive from a transfer of oscillator strength into the lowest (k = 0) state. We find that concomitantly, the degeneracy of the dipole-allowed first excited (k = ±1) state is lifted, leading to an ultrafast polarization switching effect in the emission from strongly symmetry-broken nanorings.

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