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429 results on '"Zheng, Sheng-Run"'

7. An unprecedented 2D covalent organic framework with an htb net topology

Author

Cai, Song-Liang, He, Zi-Hao, Li, Xin-Le, Zhang, Kai, Zheng, Sheng-Run, Fan, Jun, Liu, Yi, and Zhang, Wei-Guang

Subjects
Inorganic Chemistry, Chemical Sciences, Organic Chemistry, Chemical sciences, Engineering
Abstract

A 2D imine-linked COF with a hitherto unreported htb type topology was synthesized from a linear diamine linker and a judiciously designed tetra-aldehyde building block. This work opens the door to the development of COFs with unprecedented topologies and may broaden the scope of COF functional materials by pore size and pore surface engineering.

Published
2019

8. Stable Hydrazone-Linked Covalent Organic Frameworks Containing O,N,O′-Chelating Sites for Fe(III) Detection in Water

Author

Chen, Gui, Lan, Hai-Hang, Cai, Song-Liang, Sun, Bing, Li, Xin-Le, He, Zi-Hao, Zheng, Sheng-Run, Fan, Jun, Liu, Yi, and Zhang, Wei-Guang

Subjects
Inorganic Chemistry, Macromolecular and Materials Chemistry, Chemical Sciences, covalent organic frameworks, functional chelating sites, hydrazone-linked COF, iron(III) selective fluorescent probe, stable luminescent COF, Engineering, Nanoscience & Nanotechnology, Chemical sciences, Physical sciences
Abstract

Two stable crystalline hydrazone-linked covalent organic frameworks (COFs) (Bth-Dha and Bth-Dma) containing functional O,N,O'-chelating sites have been designed and successfully synthesized by the Schiff-base condensation reactions between benzene-1,3,5-tricarbohydrazide (Bth) and 2,5-dihydroxyterephthalaldehyde (Dha) or 2,5-dimethoxyterephthal-aldehyde (Dma), respectively. Bth-Dma exhibits strong fluorescence in the solid state and in an aqueous dispersion, while no fluorescence can be observed for Bth-Dha. Interestingly, the as-synthesized Bth-Dma can be used as a turn-off fluorescence sensor for the Fe(III) ion in aqueous solution with outstanding selectivity and sensitivity. The recognition process can be attributed to the coordination interaction between Fe(III) ion and the O,N,O'-chelating sites in the pore wall of Bth-Dma COF, as verified by X-ray photoelectron spectroscopy and 1H NMR spectroscopy. To the best of our knowledge, this is the first report on the rational design of luminescent COF with predesigned O,N,O'-chelating sites as a fluorescence sensor for highly selective and sensitive metal ion detection. This work may pave the way for designing luminescent COF sensors with functional binding sites for detecting specific metal ions.

Published
2019

15. Construction of binary metal–organic cage-based materials via a "covalently linked plus cage encapsulated" strategy.

Author

Lai, Pei, Wu, Jia-Xuan, Wu, Liang-Hua, Li, Lai-Yi, Cai, Song-Liang, and Zheng, Sheng-Run

Subjects
POROSITY
Abstract

A strategy for constructing binary metal–organic cage (MOC)-based materials was developed. The cationic MOCs were covalently linked by organic linkers to a cationic extended network, whereas the anionic MOCs acted as counterions and were encapsulated in the network. Compared with the corresponding unary materials, the binary MOC-based materials exhibited improved porosity and adsorption performance. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Rationally Designed 2D Covalent Organic Framework with a Brick-Wall Topology

Author

Cai, Song-Liang, Zhang, Kai, Tan, Jing-Bo, Wang, Sha, Zheng, Sheng-Run, Fan, Jun, Yu, Ying, Zhang, Wei-Guang, and Liu, Yi

Subjects
Inorganic Chemistry, Macromolecular and Materials Chemistry, Chemical Sciences, Physical Chemistry (incl. Structural), Macromolecular and materials chemistry, Physical chemistry
Abstract

We report the design and synthesis of an imine-based two-dimensional covalent organic framework (2D COF) with a novel brick-wall topology by judiciously choosing a tritopic T-shaped building block and a ditopic linear linker. Unlike the main body of COF frameworks reported to-date, which consists of higher-symmetry 2D topologies, the unconventional layered brick-wall topology have only been proposed but never been realized experimentally. The brick-wall structure was characterized by powder X-ray diffraction analysis, FT-IR, solid state 13C NMR spectroscopy, nitrogen, and carbon oxide adsorption-desorption measurements as well as theoretical simulations. Our present work opens the door to the design of novel 2D COFs and will broaden the scope of emerging COF materials.

Published
2016

23. Hierarchical porous amorphous metal–organic frameworks constructed from ZnO/MOF glass composites.

Author

Feng, Ying, Wu, Jia-Xuan, Mo, Yi-Hong, Liu, Shuai, Cai, Song-Liang, Zhang, Wei-Guang, Fan, Jun, and Zheng, Sheng-Run

Subjects
GLASS composites, METAL-organic frameworks, ZINC oxide, MESOPORES
Abstract

For the first time, hierarchical porous amorphous metal–organic frameworks (HP-aMOFs) containing ultramicropores, micropores, and mesopores were synthesized by etching a composite of MOF glass (agZIF-76) and ZnO using ammonia. These materials show potential applications in the adsorption of C2 hydrocarbons. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Iodine Adsorption–Desorption-Induced Structural Transformation and Improved Ag+Turn-On Luminescent Sensing Performance of a Nonporous Eu(III) Metal–Organic Framework

Author

Zhang, Chu-Hong, Zhou, Bing-xun, Lin, Xian, Mo, Yi-Hong, Cao, Jun, Cai, Song-Liang, Fan, Jun, Zhang, Wei-Guang, and Zheng, Sheng-Run

Abstract

Posttreatment of pristine metal–organic frameworks (MOFs) with suitable vapor may be an effective way to regulate their structures and properties but has been less explored. Herein, we report an interesting example in which a crystalline nonporous Eu(III)-MOF was transferred to a porous amorphous MOF (aMOF) via iodine vapor adsorption–desorption posttreatment, and the resulting aMOF showed improved turn-on sensing properties with respect to Ag+ions. The crystalline Eu-MOF, namely, Eu-IPDA, was assembled from Eu(III) and 4,4′-{4-[4-(1H-imidazol-1-yl)phenyl]pyridine-2,6-diyl}dibenzoic acid (H2IPDA) and exhibited a two-dimensional (2D) coordination network based on one-dimensional secondary building blocks. The close packing of the 2D networks gives rise to a three-dimensional supramolecular framework without any significant pores. Interestingly, the nonporous Eu-IPDA could absorb iodine molecules when Eu-IPDA crystals were placed in iodine vapor at 85 °C, and the adsorption capacity was 1.90 g/g, which is comparable to those of many MOFs with large BET surfaces. The adsorption of iodine is attributed to the strong interactions among the iodine molecule, the carboxy group, and the N-containing group and leads to the amorphization of the framework. After immersion of the iodine-loaded Eu-IPDA in EtOH, approximately 89.7% of the iodine was removed, resulting in a porous amorphous MOF, denoted as a-Eu-IPDA. In addition, the remaining iodine in the a-Eu-IPDA framework causes strong luminescent quenching in the fluorescence emission region of the Eu(III) center when compared with that in Eu-IPDA. The luminescence intensity of a-Eu-IPDA in water suspensions was significantly enhanced when Ag+ions were added, with a detection limit of 4.76 × 10–6M, which is 1000 times that of pristine Eu-IPDA. It also showed strong anti-interference ability over many common competitive metal ions and has the potential to sense Ag+in natural water bodies and traditional Chinese medicine preparations. A mechanistic study showed that the interactions between Ag+and the absorbed iodine, the carboxylate group, and the N atoms all contribute to the sensing performance of a-Eu-IPDA.

Published
2024
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