Volume 60, Issue 52 pp. 27171-27177
Research Article

Ultrahigh Supramolecular Cascaded Room-Temperature Phosphorescence Capturing System

Dr. Man Huo

Dr. Man Huo

College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071 P. R. China

These authors contributed equally to this work.

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Xian-Yin Dai

Xian-Yin Dai

College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071 P. R. China

These authors contributed equally to this work.

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Prof. Dr. Yu Liu

Corresponding Author

Prof. Dr. Yu Liu

College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071 P. R. China

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First published: 26 October 2021
Citations: 107

Dedicated to the 100th anniversary of Chemistry at Nankai University

Graphical Abstract

An ultrahigh supramolecular cascaded RTP-capturing system was constructed based on a multivalent supramolecular aggregate using cucurbit[7]uril (CB[7]) and sulfonatocalix[4]arene (SC4AD) in aqueous medium. Energy transfer from G⊂CB[7]@SC4AD to primary (RhB or DBT) and then to secondary energy acceptors (Cy5 or NiB) gives rise to long-range and long-lived photoluminescence, especially NIR delayed emission (675 nm).

Abstract

An ultrahigh supramolecular cascaded phosphorescence-capturing aggregate was constructed by multivalent co-assembly of cucurbit[7]uril (CB[7]) and amphipathic sulfonatocalix[4]arene (SC4AD). The initial dibromophthalimide derivative (G) generated a weak phosphorescent emission at 505 nm by host–guest interaction with CB[7], which further assembled with SC4AD to form homogeneously spherical nanoparticles with a dramatic enhancement of both phosphorescence lifetime to 1.13 ms and emission intensity by 40-fold. Notably, this G⊂CB[7]@SC4AD aggregate exhibited efficient phosphorescence energy transfer to Rhodamine B (RhB) and benzothiadiazole (DBT) with high efficiency (ϕET) of 84.4 % and 76.3 % and an antenna effect (AE) of 289.4 and 119.5, respectively, and then each of these can function as a bridge to further transfer their energy to second near-IR acceptors Cy5 or Nile blue (NiB) to achieve cascaded phosphorescence energy transfer. The final aggregate with long-range effect from 425 nm to 800 nm and long-lived photoluminescence was further employed as an imaging agent for multicolour cell labeling.

Conflict of interest

The authors declare no conflict of interest.

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