Cucurbit[8]uril-Mediated Polypseudorotaxane for Enhanced Lanthanide Luminescence Behavior in Water

Abstract

A novel supramolecular polypseudorotaxane was successfully constructed with pseudo[3]­rotaxanes between pyridine-2,6-dicarboxylic acid imidazolium (G1) and cucurbit[8]­uril (CB[8]) and the subsequent coordination with lanthanide ions. Significantly, compared with the pyridine-2,6-dicarboxylic acid imidazolium complex G1@Tb3+, CB[8]-mediated polypseudorotaxane CB[8]@G1 2 @Tb3+ not only displayed enhanced lanthanide luminescence behavior with a 29.1-fold time enhancement (from 45.76 μs to 1.33 ms) of the excited-state lifetime (τ) and a 8.7-fold increase (from 0.89% to 7.81%) in the quantum yield (Φ) but also exhibited a specific fluorescence response to antibiotics in an aqueous solution and a solid film.

Tunable Multicolor Lanthanide Supramolecular Assemblies with White Light Emission Confined by Cucurbituril[7]

“…The lanthanide-pseudo [2]rotaxane complex was constructed by CB[7] and naphthylimidazolium salt of pyridine-2,6-dicarboxylic acid (G 1 ) coordination with lanthanide ions in Scheme 1. The ligand G 1 was synthesized (Figures S1-S3, Supporting Information) according to reported method, [17] and the structure was presented in Scheme S1, Supporting Information. Similar to previous work, CB[7] could form a highly stable 1:1 complex with naphthylpyridinium.…”

“…The q value in the G 1 /Tb 3+ aqueous solution was about 1.95, while the q value of the assembly CB[7]/G 1 /Tb 3+ was reduced to 0.38. This result indicates that the addition of CB[7] not only has a confined effect on G 1 to reduce the non-radiative transition, but also effectively shields the coordination of water molecules with Ln to a certain extent, increases the sensitization of the antenna molecule G 1 , [12,17] and then promotes the luminescence behavior of Ln. Furthermore, we compared the morphology, particle size, and potential of the assemblies.…”

Cucurbit[10]uril-Based Orthogonal Supramolecular Polymers with Host–Guest and Coordination Interactions and Its Applications in Anion Classification

“…Cucurbit­[ n ]­urils (Q­[ n ]­s or CB­[ n ], n = 5–8,10, and 13–15), as one of the famous macrocyclic hosts, were often utilized in the construction of the orthogonal supramolecular assemblies due to the unique host–guest recognition behaviors. − Liu and his co-workers constructed an orthogonal novel supramolecular polypseudorotaxane (Q[8]@G1 2 @Tb 3+ ) by pyridine-2,6-dicarboxylic acid imidazolium, Q[8] and Tb 3+ , where Q[8] tightly bonds with the naphthyl group of pyridine-2,6-dicarboxylic acid imidazolium. Q[8]@G1 2 @Tb 3+ not only effectively induces a unique metallic luminescence but also exhibits specific responses to antibiotics.…”

Lanthanide-Mediated Cyclodextrin-Based Supramolecular Assembly-Induced Emission Xerogel Films: A Transparent Multicolor Photoluminescent Material

“…Lanthanide ions are usually regarded as prior metal ions to build photoluminescence materials because of their excellent coordination abilities and fluorescence properties, which have attracted great attention in recent years. − Hence, supramolecular metallic hydrogels based on lanthanide ions, due to their excellent photoluminescence properties, are not only excellent sources for the preparation soft materials but also used in unprecedented applications ranging from luminescence sensing, imaging and data storage. , Different from traditional soft materials, solid-state supramolecular xerogel films have potential applications in novel adsorbent materials, , photochromic smart windows, − and LEDs , with the advantage of portability and in situ visualization.…”