{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T16:04:34Z","timestamp":1770221074903,"version":"3.49.0"},"reference-count":71,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T00:00:00Z","timestamp":1769990400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"NSFC","doi-asserted-by":"crossref","award":["W2521100"],"award-info":[{"award-number":["W2521100"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100001809","name":"NSFC","doi-asserted-by":"crossref","award":["U25A20619"],"award-info":[{"award-number":["U25A20619"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100001809","name":"NSFC","doi-asserted-by":"crossref","award":["22473021"],"award-info":[{"award-number":["22473021"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"name":"National Key Research and Development Program of China","award":["2023YFE0197600"],"award-info":[{"award-number":["2023YFE0197600"]}]},{"name":"Research and Innovation Team Project of Dalian University of Technology","award":["DUT2022TB10"],"award-info":[{"award-number":["DUT2022TB10"]}]},{"DOI":"10.13039\/501100012226","name":"Fundamental Research Funds for the Central Universities","doi-asserted-by":"crossref","award":["DUT22LAB610"],"award-info":[{"award-number":["DUT22LAB610"]}],"id":[{"id":"10.13039\/501100012226","id-type":"DOI","asserted-by":"crossref"}]},{"name":"State Key Laboratory of Fine Chemicals of Dalian University of Technology"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>The photophysical properties of a BODIPY derivative with the highly twisted molecular structure of anthracene-fused boron\u2013dipyrromethene (AN-BDP) were studied with steady-state and time-resolved spectroscopic methods. The fused anthryl and the BDP units in AN-BDP units both adopt distorted geometry (with ca. 10\u00b0 of torsion), and there is large dihedral angle between the two units (ca. 49.7\u00b0). Interestingly, the fluorescence quantum yields are highly dependent on the solvent polarity (59~3%, from toluene to acetonitrile), yet the fluorescence emission wavelength does not change in different solvents. Nanosecond transient absorption spectra indicate that the triplet state is long-lived, with an intrinsic triplet state lifetime of 551 \u03bcs. Interestingly the severely twisted structure only shows a moderate intersystem crossing (ISC) yield (10%). Femtosecond transient absorption spectra indicate slow ISC (&gt;1.5 ns), which is in agreement with the fluorescence lifetime (2.3 ns). Time-resolved electron paramagnetic resonance (TREPR) spectra show smaller zero-field-splitting D and E tensors as (\u221271.4 mT, 16.7 mT, respectively) compared to the triplet state of the iodinated native BDP (D = \u2212104.6 mT, E = 22.8 mT), inferring that the triplet-state wave function of the new compound is delocalized over the twisted molecular framework. The theoretical computation indicated a solvent-polarity-dependent energy barrier for the relaxed S1 state to a conical interaction (CI) of the S1 and the S0 state potential curves, which agrees with the weaker fluorescence in polar solvents.<\/jats:p>","DOI":"10.3390\/molecules31030524","type":"journal-article","created":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T16:12:37Z","timestamp":1770048757000},"page":"524","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Twisted Anthracene-Fused BODIPY: Intersystem Crossing and Torsion-Induced Non-Radiative Relaxation of the Singlet Excited State"],"prefix":"10.3390","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8927-3715","authenticated-orcid":false,"given":"Andrey A.","family":"Sukhanov","sequence":"first","affiliation":[{"name":"Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan 420029, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-1813-1960","authenticated-orcid":false,"given":"Yanran","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8175-6568","authenticated-orcid":false,"given":"Yuqi","family":"Hou","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering, Ocean and Life Sciences, Dalian University of Technology, Panjin 124221, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-8582-1024","authenticated-orcid":false,"given":"Bei","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu","family":"Dong","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5405-6398","authenticated-orcid":false,"given":"Jianzhang","family":"Zhao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Violeta K.","family":"Voronkova","sequence":"additional","affiliation":[{"name":"Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan 420029, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bernhard","family":"Dick","sequence":"additional","affiliation":[{"name":"Lehrstuhl f\u00fcr Physikalische Chemie, Institut f\u00fcr Physikalische und Theoretische Chemie, Universit\u00e4t Regensburg, Universit\u00e4tsstr. 31, D-93053 Regensburg, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"6891","DOI":"10.1021\/cr1002613","article-title":"Singlet Fission","volume":"110","author":"Smith","year":"2010","journal-title":"Chem. 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