{"title":"Uncovering the mask of sensitizers to switch on the TTA-UC emission by supramolecular host-guest complexation","authors":"Cheng He, Renlan Huang, Lingling Wei, Qiuhui He, Jinbo Liu, Jiao Chen, Ge Gao, Cheng Yang, Wanhua Wu","doi":"10.1016/j.cclet.2024.110103","DOIUrl":null,"url":null,"abstract":"<div><div>Pt(II)−salophen complexes (<strong>S-1∼S-4</strong>) and 9,10-diphenylanthracene (DPA) tethering pillar[5]arene derivatives (<strong>A-1</strong> and <strong>A-2</strong>) were synthesized to act as sensitizers and annihilators for triplet-triplet annihilation upconversion (TTA-UC), respectively. It turned out that the pyridine cation served as a mask for the excited state of the sensitizer, the triplet states of <strong>S-2</strong> and <strong>S-3</strong> were significantly quenched by photo-induced electron transfer (PET) with phosphorescence quantum yield quenched from 24.4 % for <strong>S-4</strong> to 9.3 % for <strong>S-3</strong>, and therefore, both <strong>S-2</strong> and <strong>S-3</strong> led to negligible UC emissions when traditional annihilator DPA was used as the annihilator. Delightfully, when supramolecular annihilator <strong>A-1</strong> and <strong>A-2</strong> were employed to include the pyridine cation, PET was significantly inhibited and the triplet states of the sensitizers were activated, TTA-UC emission was therefore boosted. The UC quantum yield of <strong>A-2/S-3</strong> system was up to 130 times higher than that of DPA/<strong>S-3</strong> system, and the UC emission was switchable by the addition of competitive guests.</div></div>","PeriodicalId":10088,"journal":{"name":"Chinese Chemical Letters","volume":"36 4","pages":"Article 110103"},"PeriodicalIF":8.9000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Chemical Letters","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1001841724006223","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/6/7 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Pt(II)−salophen complexes (S-1∼S-4) and 9,10-diphenylanthracene (DPA) tethering pillar[5]arene derivatives (A-1 and A-2) were synthesized to act as sensitizers and annihilators for triplet-triplet annihilation upconversion (TTA-UC), respectively. It turned out that the pyridine cation served as a mask for the excited state of the sensitizer, the triplet states of S-2 and S-3 were significantly quenched by photo-induced electron transfer (PET) with phosphorescence quantum yield quenched from 24.4 % for S-4 to 9.3 % for S-3, and therefore, both S-2 and S-3 led to negligible UC emissions when traditional annihilator DPA was used as the annihilator. Delightfully, when supramolecular annihilator A-1 and A-2 were employed to include the pyridine cation, PET was significantly inhibited and the triplet states of the sensitizers were activated, TTA-UC emission was therefore boosted. The UC quantum yield of A-2/S-3 system was up to 130 times higher than that of DPA/S-3 system, and the UC emission was switchable by the addition of competitive guests.
期刊介绍：
Chinese Chemical Letters (CCL) (ISSN 1001-8417) was founded in July 1990. The journal publishes preliminary accounts in the whole field of chemistry, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry, polymer chemistry, applied chemistry, etc.Chinese Chemical Letters does not accept articles previously published or scheduled to be published. To verify originality, your article may be checked by the originality detection service CrossCheck.
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