{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,5]],"date-time":"2025-12-05T12:19:23Z","timestamp":1764937163524,"version":"build-2065373602"},"reference-count":66,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2020,6,3]],"date-time":"2020-06-03T00:00:00Z","timestamp":1591142400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UIDB\/QUI\/00313\/2020, Roteiro\/ 0152\/2013\/022124"],"award-info":[{"award-number":["UIDB\/QUI\/00313\/2020, Roteiro\/ 0152\/2013\/022124"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"European Union's Horizon 2020 Research and Innovation Programme","award":["654148 Laser Lab-Europe"],"award-info":[{"award-number":["654148 Laser Lab-Europe"]}]},{"name":"The Scientific and Technological Research Council of Turkey","award":["Research scholarship"],"award-info":[{"award-number":["Research scholarship"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Chemistry"],"abstract":"<jats:p>The process of singlet-exciton fission (SEF) has attracted much attention of late. One of the most popular SEF compounds is TIPS-pentacene (TIPS-P, where TIPS = triisopropylsilylethynyl) but, despite its extensive use as both a reference and building block, its photophysical properties are not so well established. In particular, the triplet state excitation energy remains uncertain. Here, we report quantitative data and spectral characterization for excited-singlet and -triplet states in dilute solution. The triplet energy is determined to be 7940 \u00b1 1200 cm\u22121 on the basis of sensitization studies using time-resolved photoacoustic calorimetry. The triplet quantum yield at the limit of low concentration and low laser intensity is only ca. 1%. Self-quenching occurs at high solute concentration where the fluorescence yield and lifetime decrease markedly relative to dilute solution but we were unable to detect excimer emission by steady-state spectroscopy. Short-lived fluorescence, free from excimer emission or phosphorescence, occurs for crystals of TIPS-P, most likely from amorphous domains.<\/jats:p>","DOI":"10.3390\/chemistry2020033","type":"journal-article","created":{"date-parts":[[2020,6,4]],"date-time":"2020-06-04T04:36:09Z","timestamp":1591245369000},"page":"545-564","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["The Photophysical Properties of Triisopropylsilyl-ethynylpentacene\u2014A Molecule with an Unusually Large Singlet-Triplet Energy Gap\u2014In Solution and Solid Phases"],"prefix":"10.3390","volume":"2","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9339-7259","authenticated-orcid":false,"given":"Fabio A.","family":"Schaberle","sequence":"first","affiliation":[{"name":"CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal"}]},{"given":"Carlos","family":"Serpa","sequence":"additional","affiliation":[{"name":"CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3223-4819","authenticated-orcid":false,"given":"Luis G.","family":"Arnaut","sequence":"additional","affiliation":[{"name":"CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6946-2391","authenticated-orcid":false,"given":"Andrew D.","family":"Ward","sequence":"additional","affiliation":[{"name":"Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot OX11 0FA, UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7281-1257","authenticated-orcid":false,"given":"Joshua K. G.","family":"Karlsson","sequence":"additional","affiliation":[{"name":"Molecular Photonics Laboratory, SNES, Newcastle University, Newcastle upon Tyne NE1 7RU, UK"}]},{"given":"Alparslan","family":"Atahan","sequence":"additional","affiliation":[{"name":"Molecular Photonics Laboratory, SNES, Newcastle University, Newcastle upon Tyne NE1 7RU, UK"},{"name":"Department of Polymer Engineering, Faculty of Technology, Duzce University, 81620 Duzce, Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0679-2232","authenticated-orcid":false,"given":"Anthony","family":"Harriman","sequence":"additional","affiliation":[{"name":"Molecular Photonics Laboratory, SNES, Newcastle University, Newcastle upon Tyne NE1 7RU, UK"}]}],"member":"1968","published-online":{"date-parts":[[2020,6,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"14223","DOI":"10.1021\/jp909002d","article-title":"Singlet exciton fission for solar cell applications. 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