{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,11]],"date-time":"2026-10-11T13:19:32Z","timestamp":1791724772817,"version":"4.3.4"},"reference-count":53,"publisher":"Wiley","issue":"17","license":[{"start":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T00:00:00Z","timestamp":1773014400000},"content-version":"am","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T00:00:00Z","timestamp":1773014400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T00:00:00Z","timestamp":1773014400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/100000015","name":"U.S. Department of Energy","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000015","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2026,4,20]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Organic molecular crystals enable spin alignment of triplet excitons over macroscopic distances, offering a molecular route to solid\u2010state quantum technologies. In typical crystals, however, dense packing promotes spin decoherence through dipolar coupling and exciton hopping. Although dilution doping can mitigate these effects, reported examples remain scarce because dopants must satisfy stringent structural and energetic constraints. Here, we broaden the design space for doped organic crystals by introducing a strategy that employs a host\u2010derived dopant with intramolecular charge\u2010transfer (ICT) character that maintains structural compatibility with the host lattice, while its ICT character lowers the triplet energy to localize triplet excitons. Ultrafast transient absorption spectroscopy confirms triplet formation, while time\u2010resolved electron paramagnetic resonance (TREPR) spectroscopy reveals that these oriented triplets possess selectively addressable spin sublevel transitions. Additionally, pulse\u2010EPR measurements yield a phase memory time (\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>m<\/jats:sub>\n                    ) of 7.1 \u00b5s at 10 K and 3.5 \u00b5s at 85 K, enabled by reduced electron\u2010electron dipolar coupling and suppressed exciton hopping. Temperature\u2010dependent studies further show that coherence is ultimately limited by nuclear spin flip\u2013flops at low temperatures and spin\u2010phonon coupling at higher temperatures. These findings demonstrate that ordered triplet excitons produced by an ICT dopant in single crystals promote spin coherence at elevated temperatures.\n                  <\/jats:p>","DOI":"10.1002\/anie.202524670","type":"journal-article","created":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T07:52:06Z","timestamp":1773042726000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Intramolecular Charge\u2010Transfer Dopants Enable Isolated Triplet Excitons as Spin Qutrits in a Single Crystal"],"prefix":"10.1002","volume":"65","author":[{"given":"Yaoyao","family":"Han","sequence":"first","affiliation":[{"name":"Department of Chemistry Institute for Quantum Information Research and Engineering and Center for Molecular and Quantum Transduction Northwestern University  Evanston Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel 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M.","family":"Young","sequence":"additional","affiliation":[{"name":"Department of Chemistry Institute for Quantum Information Research and Engineering and Center for Molecular and Quantum Transduction Northwestern University  Evanston Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew D.","family":"Krzyaniak","sequence":"additional","affiliation":[{"name":"Department of Chemistry Institute for Quantum Information Research and Engineering and Center for Molecular and Quantum Transduction Northwestern University  Evanston Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2920-5440","authenticated-orcid":false,"given":"Michael R.","family":"Wasielewski","sequence":"additional","affiliation":[{"name":"Department of Chemistry Institute for Quantum Information Research and Engineering and Center for Molecular and Quantum Transduction Northwestern University  Evanston Illinois 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