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26. Role of Functionalized Pillararene Architectures in Supramolecular Catalysis.

Author

Wang, Kaiya, Jordan, Jacobs H., Velmurugan, Krishnasamy, Tian, Xueqi, Zuo, Minzan, Hu, Xiao‐Yu, and Wang, Leyong

Subjects
*CATALYSIS, *SUPRAMOLECULAR chemistry, *FUNCTIONAL groups, *HOST-guest chemistry
Abstract

The many useful features possessed by pillararenes (PAs; e.g. rigid, capacious, and hydrophobic cavities, as well as exposed functional groups) have led to a tremendous increase in their popularity since their first discovery in 2008. In this Minireview, we emphasize the use of functionalized PAs and their assembled supramolecular materials in the field of catalysis. We aim to provide a fundamental understanding and mechanism of the role PAs play in catalytic process. The topics are subdivided into catalysis promoted by the PA rim/cavity, PA‐based nanomaterials, and PA‐based polymeric materials. To the best of our knowledge, this is the first overview on PA‐based catalysis. This Minireview not only summarizes the fabrications and applications of PAs in catalysis but also anticipates future research efforts in applying supramolecular hosts in catalysis. [ABSTRACT FROM AUTHOR]

Published
2021
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32. The emerging applications of pillararene architectures in supramolecular catalysis

Author

Wang, Kaiya, Tian, Xueqi, Jordan, Jacobs H., Velmurugan, Krishnasamy, Wang, Leyong, and Hu, Xiao-Yu

Abstract

Over the last decade, numerous research efforts have been devoted to pillar[n]arenes since their debut. The popularity of pillararenes is a reflection of current research trend in supramolecular and macrocyclic chemistry in general. Among the vast applications (such as chemosensors, drug delivery, transmembrance channels, and separation) of pillararenes, their utilization in catalysis is a relatively less explored area. However, soaring attention has been paid by researchers in recent years and this field has seen gradual increasing publications. Therefore, in this review we will discuss progress in the emerging applications of pillararene architectures in catalysis based on various reaction genre including reduction, oxidation, coupling, decomposition and others. Furthermore, this review not only focuses on the pillararenes based current progress in catalysis, but also provides the signs for future development in this research field.

Published
2021
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33. Repurposing Cotton Gin Trash for Cellulose Nanofibril-Silver Hybrid and Ultralight Silver-Infused Aerogel.

Author

Nam S, Easson MW, Jordan JH, He Z, Lima IM, Hillyer MB, Ernst NE, Fang D, and Islam MM

Abstract

Cellulose nanofibril-silver (CNF-Ag) hybrid and ultralight silver-infused aerogel were produced using cotton gin trash (CGT), an abundant agro-waste material. This repurposing of CGT was achieved by exploiting its potential for CNF extraction and the in situ synthesis of silver nanoparticles (Ag NPs). CNFs were extracted from CGT through a mechanical shearing process. These CNFs served as a multifunctional nanotemplate for the controlled reduction of Ag ions, efficient nucleation, and stabilization of NPs, resulting in the production of a high concentration of Ag NPs (ca. 19 wt %) within the CNFs. Transmission electron microscopy images of cross-sectioned CNFs confirmed the uniform dispersion of NPs (ca. 18 nm diameter) inside the CNFs. Rietveld refinement analysis of X-ray diffraction patterns revealed that CNFs produced smaller Ag crystallites compared to CGT microparticles. The CNF-Ag hybrid was then fabricated into an aerogel using freeze-drying, with its weight being light enough to rest on a cotton flower's stamen. The infusion of Ag NPs led to approximately 20% reductions in the specific surface area and pore volume of the aerogel., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)

Published
2024
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34. Supramolecular Strategies for Controlling Reactivity within Confined Nanospaces.

Author

Wang K, Jordan JH, Hu XY, and Wang L

Subjects
Catalysis, Catalytic Domain, Models, Molecular, Nanotechnology
Abstract

Nanospaces are ubiquitous in the realm of biological systems and are of significant interest among supramolecular chemists. Understanding chemical behavior within nanospaces offers new perspectives on biological phenomena in nature and opens the way to highly unusual and selective forms of catalysis. Supramolecular chemistry exploits weak, yet effective, intermolecular interactions such as hydrogen bonding, metal-ligand coordination, and the hydrophobic effect to assemble nano-sized molecular architectures, providing reactions with remarkable rate acceleration, substrate specificity, and product selectivity. In this minireview, the focus is on the strategies that supramolecular chemists use to emulate the efficiency of biological processes, and elucidating how chemical reactivity is efficiently controlled within well-defined nanospaces. Approaches such as orientation and proximity of substrate, transition-state stabilization, and active-site incorporation will be discussed., (© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2020
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