A facile synthetic method to form cage-annulated crown ether with anchored imidazolium units was developed. The present work verified the potential application of the metal-carbene template approach (MCTA) in the preparation of novel flexible polyimidazolium cages by photochemical [2+2] cycloaddition reactions and may provide a new method for the preparation of flexible pure organic cages with incorporation of a variety of functional sites.
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http://dx.doi.org/10.1039/d1cc03416b | DOI Listing |
Chem Commun (Camb)
September 2021
College of Chemistry and Materials Science, FM & EM International Joint Laboratory, Northwest University, Xi'an 710127, P. R. China.
Angew Chem Int Ed Engl
September 2020
Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710127, P. R. China.
Controlling the size and surface functionalization of nanoparticles (NPs) can lead to improved properties and applicability. Herein, we demonstrate the efficiency of the metal-carbene template approach (MCTA) to synthesize highly robust and soluble three-dimensional polyimidazolium cages (PICs) of different sizes, each bearing numerous imidazolium groups, and use these as templates to synthesize and stabilize catalytically active, cavity-hosted, dispersed poly-N-heterocyclic carbene (NHC)-anchored gold NPs. Owing to the stabilization of the NHC ligands and the effective confinement of the cage cavities, the as-prepared poly-NHC-shell-encapsulated AuNPs displayed promising stability towards heat, pH, and chemical regents.
View Article and Find Full Text PDFChemistry
June 2020
Key Laboratory of Synthetic and Natural Functional Molecule of the, Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710127, P. R. China.
Polyimidazolium-based cages are considered promising materials based on their fascinating properties and potential applications. These three-dimensional functional structures are highly desirable for the recognition of particular guest molecules, however, their synthesis remains challenging. In this work, we have designed and synthesizes a pure [n]-imidazolium (n=16) cage, the hexadecakisimidazolium salt H -2(PF ) , from tetragonal octakisimidazolium salt H -1(PF ) .
View Article and Find Full Text PDFChem Rev
October 2018
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, College of Chemistry and Materials Science , Northwest University, Xi'an 710127 , P. R. China.
Although the coordination chemistry of N-heterocyclic carbenes (NHCs) with transition metals has been explored for half a century, only in the past ten years has the chemistry of metallosupramolecular assemblies based on poly-NHC ligands been studied more extensively. Remarkable discrete assemblies featuring poly-NHC ligands including two-dimensional metallacycles and three-dimensional metallaprisms/cages have since emerged. These assemblies are mostly obtained starting from various imidazolium or benzimidazolium salts.
View Article and Find Full Text PDFACS Appl Mater Interfaces
May 2018
Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry , University of Science and Technology Beijing, Beijing 100083 , China.
Two new polyoxometalate (POM)-based three-dimensional metal organic carbene frameworks, [Ag(trz)(HO)][HPWO] (POMs@MCNCs-1) and [Ag(trz)(HO)][HSiWO] (POMs@MCNCs-2), were hydrothermally synthesized, in which Keggin-type polyoxoanions as templates induce the formation of two different kinds of metal-carbene nanocages (MCNCs) for the first time. Combination of the reversible multielectron redox behavior and electron storage functions of POMs with the good electrical conductivity of the single-walled carbon nanotubes (SWNTs) renders the POMs@MCNCs-1/SWNT composite excellent electrochemical performance and good stability as anode materials of lithium-ion batteries, with up to 2000 mA h g for the first discharge capacity and ca. 859 mA h g for the second cycle at a current density of 100 mA g.
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