Long-Lived Charge Separation in Gold Nanoparticles Encapsulated inside Cucurbit[7]uril and Its Relevance for Photocatalysis

Montes‐Navajas, Pedro; Garcı́a, Hermenegildo

doi:10.1021/jp107784w

Cited by 15 publications

(10 citation statements)

References 32 publications

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“…379 The same author also showed that photolysis of Au@CB [7] at 532 nm affords an intense transient spectrum generated upon electron ejection from excited Au clusters, which decays well past 1.6 ms; CB [7] hinders electron-hole recombination between the Au clusters, and no transient is detected with larger Au NPs, as expected. 380 Irradiated Au@CB [7] NPs were also found to enhance the rate of dimerization of phenylacetylene to 1,3-diphenylbutadiyne by a factor of 7, since light generates positively charged Au clusters that promote the reaction. 380 Scherman recently reported that the aggregation of Au NPs could be controlled by CB [5] (see Fig.…”

Section: Polymers Cb[n]mentioning

confidence: 99%

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Cucurbituril chemistry: a tale of supramolecular success

et al. 2012

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This review highlights the past six year advances in the blossoming field of cucurbit[n]uril chemistry. Because of their exceptional recognition properties in aqueous medium, these pumpkin-shaped macrocycles have been generating some tremendous interest in the supramolecular community. They have also become key units in various self-organizing and stimulus-controlled assemblies, as well as in advanced materials and drug carriers. The scope of this review is limited to the main family of cucurbit[n]urils (n = 5, 6, 7, 8, 10). The reader will find an overview of their preparation, their physicochemical and biological properties, as well as their recognition abilities towards various organic and inorganic guests. Detailed thermodynamic and kinetic considerations, as well as multiple applications including supramolecular catalysis are also discussed.

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Section: Polymers Cb[n]mentioning

confidence: 99%

“…380 Irradiated Au@CB [7] NPs were also found to enhance the rate of dimerization of phenylacetylene to 1,3-diphenylbutadiyne by a factor of 7, since light generates positively charged Au clusters that promote the reaction. 380 Scherman recently reported that the aggregation of Au NPs could be controlled by CB [5] (see Fig. 28).…”

Section: Polymers Cb[n]mentioning

confidence: 99%

Cucurbituril chemistry: a tale of supramolecular success

et al. 2012

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“…This could be possible if we can encapsulate the porphyrin molecule within macrocyclic receptors. Cyclodextrin, crown ether, calix[ n ]arene, and cucurbit [ n ] uril are the few examples of macrocyclic receptors used in host–guest chemistry. − Among these macrocyclic molecules, cucurbit [ n ] uril has attracted much attention due to its unique abilities to encapsulate both cationic and hydrophobic moieties by its two negatively charged portal surface and hydrophobic interior, respectively. − …”

Section: Introductionmentioning

confidence: 99%

Fluorescence Switching of Quantum Dot in Quantum Dot–Porphyrin–Cucurbit [7] Uril Assemblies

et al. 2013

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The fluorescence switching of alloy (Cd1–x Zn x S) quantum dot (QD) in the presence of porphyrin and cucurbit [7] uril has been demonstrated using steady-state and time-resolved spectroscopy. The assemblies of Cd1–x Zn x S QD, 5-(4-aminophenyl)-10,15,20-triphenyl-21H,23H-porphyrin (APTPP), have been prepared by electrostatically attaching the negatively charged QD with positively charged APTPP. The drastic photoluminescence (PL) quenching and the shortening of decay time of alloy QD in the presence of porphyrin indicate the efficient energy transfer from QD to porphyrin. It is interesting to note that the PL quenching varies with changing the alloy composition, which reveals that the quenching of QD luminescence by porphyrin could be used as a probe for detection of porphyrin. Furthermore, in the presence of cucurbit [7] uril, CB[7] acts as a receptor to bind the porphyrin (quencher) and restore the luminescence of the QD by preventing the energy transfer from QD to porphyrin. Encapsulation of APTPP molecules within CB[7] is confirmed by steady-state and time-resolved anisotropic spectroscopy. The turn off/on fluorescence of luminescent QD opens a new opportunity for designing a new optical-based sensor for bioapplications.

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“…瓜环由于其特有的结构特性和广阔的应用前景, 越来越受到主客体化学、自组装超分子化学、环境化学、催化、材料化学、生物化学等国内外相关学科研究者的广泛关注 [32][33] . 在催化领域, 瓜环两端分布高极性的羰基基团对电荷稠密的金属阳离子表现出高度的亲和力, 因而科研工作者们利用瓜环作为载体成功制备了各种贵金属纳米粒子 [34][35][36][37][38][39] . 在前期的工作中, 本课题组已成功合成了负载在瓜环上的各种贵金属纳米颗粒(Pd, Pt, Au, Ir, Ru), 它们具有良好的催化活性、稳定性和可重复使用性 [40][41][42][43][44][45][46] [47] .…”

Section: 引言unclassified

Ultrafine Platinum Nanoparticles Derived from Supramolecular Crystal for Catalytic Hydrogenation of Nitroarenes

Zhang¹,

Li²,

Xiong³

et al. 2021

Acta Chimica Sinica

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The development of a general synthetic approach for stable ultrafine heterogeneous nanocatalysts has attracted extensive attentions worldwide. However, the complex synthetic process and structure unstability have been recognized as the bottleneck of their investigation and practical application. Herein, a convenient and high selective platinum nanocatalyst was developed based from crystalline supramolecular hybrid solid materials. The macrocyclic decamethylcucurbit[5]uril (Me 10 CB [5]) and [PtCl 6 ] 2anions were firstly self-assembled into cyrstalline supramolecular solid in the presence of different alkali metal ions (Li ＋ , Na ＋ , K ＋ ). Then, ultrafine platinum (Pt) nanoparticles (NPs) have been successfully synthesized through in-situ reduction of cyrstalline supramolecular assemblies under mild thermal treatment at H 2 atmosphere. Uniform Pt NPs (ca. 3.0 nm) are produced and deposited on Me 10 CB[5] substrate to form M-Pt@Me 10 CB[5] (M＝Li ＋ , Na ＋ , K ＋ ) composite materials. The obtained Pt NPs are characterized extensively by a range of physical measurements including X-ray powder diffractions (PXRD), thermogravimetric analyses (TGA), inductively coupled plasma emission spectrometer (ICP), X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM). The morphology and size of Pt NPs can be easily tuned through changing the original supramolecular structures. The different interaction between [PtCl 6 ] 2and Me 10 CB[5] capsulates affects the morphology and size of Pt NPs greatly. Such differences in geometric structures of Pt NPs have a significant impact on their catalytic performance. Moreover, the unique confinement effect provided by the supramolecular assembly as well as the special steric effect offered by macrocyclic Me 10 CB [5] suppresses the growth of Pt NPs during the reduction process. In addition, the atomic level uniform dispersion of Pt ions in ordered crystalline structure of the supramolecular assembly assures the uniform distribution of the final Pt NPs on the intact Me 10 CB [5], which acts as both a stabilizer and support. The Pt NPs obtained from Na ＋ and K ＋ constructed supramolecular assemblies exhibit high activity and chemoselectivity in catalytic hydrogenation of substituted nitrobenzenes to corresponding anilines under mild conditions. Meanwhile, the final Pt NPs also show an excellent stability in recycle test without dramatic loss of activity. This work demonstrates a novel, high-performance catalyst for the chemoselective hydrogenation reaction, and opens up a new approach for the preparation of nanocatalysts, which can be used in many other important fields, such as electrochemistry, energy science and environmental protection.

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Long-Lived Charge Separation in Gold Nanoparticles Encapsulated inside Cucurbit[7]uril and Its Relevance for Photocatalysis

Cited by 15 publications

References 32 publications

Cucurbituril chemistry: a tale of supramolecular success

Cucurbituril chemistry: a tale of supramolecular success

Fluorescence Switching of Quantum Dot in Quantum Dot–Porphyrin–Cucurbit [7] Uril Assemblies

Ultrafine Platinum Nanoparticles Derived from Supramolecular Crystal for Catalytic Hydrogenation of Nitroarenes

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