1 Ocak 2021 Dergi makalesi Açık Erişim

Karlsson, Joshua K. G.; Atahan, Alparslan; Harriman, Anthony; Tkachenko, Nikolai, V; Ward, Andrew D.; Schaberle, Fabio A.; Serpa, Carlos; Arnaut, Luis G.

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/231726</identifier>
  <creators>
    <creator>
      <creatorName>Karlsson, Joshua K. G.</creatorName>
      <givenName>Joshua K. G.</givenName>
      <familyName>Karlsson</familyName>
      <affiliation>Newcastle Univ, Sch Nat &amp; Environm Sci, Mol Photon Lab, Newcastle Upon Tyne NE1 7RU, Tyne &amp; Wear, England</affiliation>
    </creator>
    <creator>
      <creatorName>Atahan, Alparslan</creatorName>
      <givenName>Alparslan</givenName>
      <familyName>Atahan</familyName>
      <affiliation>Newcastle Univ, Sch Nat &amp; Environm Sci, Mol Photon Lab, Newcastle Upon Tyne NE1 7RU, Tyne &amp; Wear, England</affiliation>
    </creator>
    <creator>
      <creatorName>Harriman, Anthony</creatorName>
      <givenName>Anthony</givenName>
      <familyName>Harriman</familyName>
      <affiliation>Newcastle Univ, Sch Nat &amp; Environm Sci, Mol Photon Lab, Newcastle Upon Tyne NE1 7RU, Tyne &amp; Wear, England</affiliation>
    </creator>
    <creator>
      <creatorName>Tkachenko, Nikolai, V</creatorName>
      <affiliation>Tampere Univ, Fac Engn &amp; Nat Sci, FIN-33720 Tampere, Finland</affiliation>
    </creator>
    <creator>
      <creatorName>Ward, Andrew D.</creatorName>
      <givenName>Andrew D.</givenName>
      <familyName>Ward</familyName>
      <affiliation>STFC Rutherford Appleton Lab, Res Complex Harwell, Cent Laser Facil, Didcot OX11 0FA, Oxon, England</affiliation>
    </creator>
    <creator>
      <creatorName>Schaberle, Fabio A.</creatorName>
      <givenName>Fabio A.</givenName>
      <familyName>Schaberle</familyName>
      <affiliation>Univ Coimbra, Dept Chem, CQC, P-3004535 Coimbra, Portugal</affiliation>
    </creator>
    <creator>
      <creatorName>Serpa, Carlos</creatorName>
      <givenName>Carlos</givenName>
      <familyName>Serpa</familyName>
      <affiliation>Univ Coimbra, Dept Chem, CQC, P-3004535 Coimbra, Portugal</affiliation>
    </creator>
    <creator>
      <creatorName>Arnaut, Luis G.</creatorName>
      <givenName>Luis G.</givenName>
      <familyName>Arnaut</familyName>
      <affiliation>Univ Coimbra, Dept Chem, CQC, P-3004535 Coimbra, Portugal</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Singlet Exciton Fission And Associated Enthalpy Changes With A Covalently Linked Bichromophore Comprising Tips-Pentacenes Held In An Open Conformation</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2021</publicationYear>
  <dates>
    <date dateType="Issued">2021-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/231726</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1021/acs.jpca.0c09961</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">A covalently linked bichromophore, embracing 6,13-bis(triisopropylsilylethinyl)pentacene (TIPS-pentacene) terminals bridged by a rigid fluorene spacer, generates a relatively high yield (i.e., 65 +/- 6%) of the spin-correlated, triplet biexciton upon illumination in toluene. Under the same conditions, the extent of fluorescence quenching relative to the parent TIPS-pentacene approaches 97% and is insensitive to temperature. The biexciton, having overall singlet spin multiplicity, undergoes internal conversion in competition to spin decorrelation. These latter processes occur on the relatively slow time scale of a hundred or so nanoseconds, possibly reflecting the restricted level of electronic communication between the terminals. Spin decorrelation leads to evolution of an independent triplet pair with an overall quantum yield of 0.50 +/- 0.06 and a lifetime of 8 +/- 2 mu s in deaerated toluene. Photoacoustic calorimetry (PAC) indicates three separate enthalpy changes: a very fast step associated with intramolecular singlet exciton fission to form the correlated triplet biexciton, a fast step essentially reflecting spin decorrelation, and a slow step associated with relaxation of the independent triplet pair. Analysis of the PAC data, in conjunction with the transient absorption results, establishes excitation energies for both spin-correlated and independent triplet pairs. Polar solvent enhances both fluorescence quenching and triplet formation at the expense of radiationless decay while temperature effects have been recorded for all important intermediate species.</description>
  </descriptions>
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