{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T09:29:40Z","timestamp":1785403780096,"version":"3.56.0"},"reference-count":51,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2026,5,28]],"date-time":"2026-05-28T00:00:00Z","timestamp":1779926400000},"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":"publisher","award":["22473021"],"award-info":[{"award-number":["22473021"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"NSFC","doi-asserted-by":"publisher","award":["W2521100"],"award-info":[{"award-number":["W2521100"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"NSFC","doi-asserted-by":"publisher","award":["U25A20619"],"award-info":[{"award-number":["U25A20619"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002980","name":"Research and Innovation Team Project of Dalian University of Technology","doi-asserted-by":"publisher","award":["DUT2022TB10"],"award-info":[{"award-number":["DUT2022TB10"]}],"id":[{"id":"10.13039\/501100002980","id-type":"DOI","asserted-by":"publisher"}]},{"award":["DUT2022TB10"],"award-info":[{"award-number":["DUT2022TB10"]}],"id":[{"id":"https:\/\/ror.org\/023hj5876","id-type":"ROR","asserted-by":"publisher"}]},{"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"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>We report the synthesis and characterization of the photophysical characterization of a series of rhodamine (Rho)\u2013perylenebisimide (PBI) electron donor\u2013acceptor dyad\/triads containing flexible alkyl spacers (ethylene or hexylene chains). Steady-state absorption and emission, femtosecond and nanosecond transient absorption (fs-TA and ns-TA), cyclic voltammetry, triplet\u2013triplet energy transfer (TTET) experiments and DFT\/TD-DFT calculations were combined to elucidate the excited-state dynamics. fs-TA spectral study indicates fast decay of the S1 state and formation of the 3PBI state (0.32\u2013663 ps), which is supported by the ns-TA spectra. The localized PBI triplet (3PBI*) exhibits unusually long lifetimes (up to 272 \u03bcs) as determined by the TTET experiment. No long-lived charge-separated (CS) state was observed. While a F\u00f6rster resonance energy transfer (FRET) probably occurs between PBI and the open-ring rhodamine, a photo-induced electron transfer is proposed to be responsible for the quenching of the fluorescence of the PBI moiety.<\/jats:p>","DOI":"10.3390\/molecules31111859","type":"journal-article","created":{"date-parts":[[2026,5,28]],"date-time":"2026-05-28T12:09:07Z","timestamp":1779970147000},"page":"1859","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Preparation and Photophysical Study of Rhodamine\u2013Perylenebisimide Electron Donor\u2013Acceptor Dyad\/Triads Containing Flexible Linkers"],"prefix":"10.3390","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-0307-5904","authenticated-orcid":false,"given":"Xin","family":"Guan","sequence":"first","affiliation":[{"name":"State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, 2 Ling Gong Road, Dalian 116024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haotian","family":"Bai","sequence":"additional","affiliation":[{"name":"College of Chemistry, Beijing Normal University, Beijing 100875, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"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, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, 2 Ling Gong Road, Dalian 116024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Wan","sequence":"additional","affiliation":[{"name":"College of Chemistry, Beijing Normal University, Beijing 100875, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1603007","DOI":"10.1002\/adfm.201603007","article-title":"Recent Progress in High-Efficiency Blue-Light-Emitting Materials for Organic Light-Emitting Diodes","volume":"27","author":"Im","year":"2017","journal-title":"Adv. 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