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Applied Sciences
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Design, Synthesis, and Application of Two-Dimensional Metal-Organic Frameworks
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Design, Synthesis, and Application of Two-Dimensional Metal-Organic Frameworks

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (10 September 2023) | Viewed by 1930

Special Issue Editor

Dr. Yuewu Zhao

E-Mail Website
Guest Editor
CAS Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Interests: MOF nanomaterials; photodynamic therapy of tumors; microneural electrode of the brain–computer interface
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metal-organic frameworks have attracted extensive attention due to their diverse structures, large specific surface areas, and numerous functions. The two-dimensional structure of MOF materials has attracted the attention of scientists all over the world based on its special geometric configuration and anisotropy. The most mature graphene material has been proven to have great potential in a variety of fields, such as supercapacitors, lithium-ion batteries, and catalysis. Therefore, based on the suitable characteristics of two-dimensional MOF materials, it has infinite possibilities in design, synthesis, and application.

Dr. Yuewu Zhao
Guest Editor

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Keywords

  • two-dimensional
  • metal-organic framework
  • design
  • synthesis
  • application

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Published Papers (1 paper)

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Research

12 pages, 5614 KiB  
Article
Guest Molecules with Amino and Sulfhydryl Groups Enhance Photoluminescence by Reducing the Intermolecular Ligand-to-Metal Charge Transfer Process of Metal–Organic Frameworks
by Yuewu Zhao, Jine Wang and Renjun Pei
Appl. Sci. 2022, 12(22), 11467; https://doi.org/10.3390/app122211467 - 11 Nov 2022
Cited by 2 | Viewed by 1462
Abstract
Micron-sized metal–organic framework (MOF) sheets were prepared using organic molecules with aggregation-induced emission (AIE) properties as ligands. The intermolecular ligand-to-metal charge transfer (LMCT) process occurs in MOF structures, resulting in the disappearance of the matrix coordination-induced emission (MCIE) effect and emergence of the [...] Read more.
Micron-sized metal–organic framework (MOF) sheets were prepared using organic molecules with aggregation-induced emission (AIE) properties as ligands. The intermolecular ligand-to-metal charge transfer (LMCT) process occurs in MOF structures, resulting in the disappearance of the matrix coordination-induced emission (MCIE) effect and emergence of the aggregation-caused quenching (ACQ) effect. Here, we demonstrate that molecules with electron donors can compete with the LMCT process in MOF structures, thereby changing the transfer path of the excitation energy and returning it to the ground state, mainly in the form of fluorescence. Organic molecules with amino or sulfhydryl groups can act as effective electron donors, reducing the LMCT process and causing the MCIE effect of the MOF sheet. The coexistence of amino and sulfhydryl groups will strongly inhibit the LMCT process of the MOF sheet, thereby greatly enhancing the MCIE effect. Therefore, these types of molecules can be used to regulate the photoluminescence intensity of AIE-based MOF materials. In addition, there are some organic molecules with multiple carboxyl or hydroxyl groups which can produce similar effects. Finally, it was confirmed that the intermolecular LMCT process is highly sensitive, and the MOF sheet showed distinguishable fluorescence results even with the addition of small molecules in the amount of 10−9 M. Thus, it is a feasible idea to use the fluorescence changes induced by the LMCT process as a sensitive sensing method for small molecules. Full article
(This article belongs to the Special Issue Design, Synthesis, and Application of Two-Dimensional Metal-Organic Frameworks)
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