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Home > News > AgC-MOF: Silver-Carbon Bonded Isoreticular Metal-Organic Frameworks: Expanding the Structural Repertoire of MOFs
AgC-MOF: Silver-Carbon Bonded Isoreticular Metal-Organic Frameworks: Expanding the Structural Repertoire of MOFs
Abstract:
1. The article delves into the synthesis of metal-organic frameworks (MOFs) using silver-carbon (Ag–C) bonds, a challenging task due to the poor reversibility of metal–carbon bonds.
2. It introduces three novel isoreticular microcrystalline MOFs, termed AgC-MOFs, which are stabilized by Ag–C bonds and feature a double coordination mode (σ and π) between Ag(I) and alkynyl.
3. These AgC-MOFs exhibit three-dimensional frameworks with one-dimensional hexagonal channels and tunable pore widths from 1.1 to 1.8 nm, marking a significant advancement in MOF structure design.


Research Background:
1. Industry Problems: Traditional MOFs synthesized using nitrogen, oxygen, and sulfur ligands lack the incorporation of M–C bonds, which could offer new coordination modes and properties.
2. Previous Research and Innovations: Previous studies have rarely explored M–C bonded MOFs due to the dynamic reversibility issues of M–C bonds. The use of alkynyl ligands in MOFs has been limited to Cu(I), with low crystallinity.
3. Authors' Innovations: The authors propose the use of Ag(I) with alkynyl ligands to create a series of novel isoreticular AgC-MOFs. They suggest that rational ligand design can modulate complex situations arising from Ag(I) and alkynyl coordination.

Experimental Details:
1. Synthesis of AgC-MOFs: The AgC-MOFs were synthesized through a solvothermal method using different-sized triangular alkynyl ligands and Ag(CH3CN)4BF4 in the presence of CO(NH2)2.
2. Characterization Techniques: The structures were analyzed using synchrotron X-ray absorption fine structure (XAFS) and powder 3. X-ray diffraction (PXRD). Other characterizations included FTIR, 13C CP-MAS NMR, XPS, thermogravimetric analysis, and elemental analysis.
4. Morphological and Porosity Analysis: SEM and TEM were used to explore the morphology, while N2 sorption at 77 K measured the porosity. The water stability was assessed by PXRD and N2 sorption after soaking in water.

Test and Analysis
1. XAFS and PXRD: XAFS provided insights into the local coordination environment of Ag, while PXRD confirmed the crystallinity and high structural stability of AgC-MOFs in water.
2. Surface Area and Pore Size: The BET surface areas ranged from 319 to 823 m² g–1, with uniform pore size distributions centered at 1.1, 1.4, and 1.8 nm.
3. Electrical Conductivity and Photocurrent Response: AgC-MOFs showed semiconductive properties with optical band gaps of 2.52–2.55 eV and exhibited photocurrents, indicating potential for charge transport applications.

Summary: 
1. The article successfully introduces a new class of isoreticular AgC-MOFs that expand the structural diversity of MOFs and demonstrate permanent porosity and water stability.
2. The paper could benefit from exploring the long-term stability of AgC-MOFs under various conditions and potential applications in practical scenarios.
3. To synthesis for larger scale production and investigating the MOFs' performance in real-world applications.


Constructing Isoreticular Metal−Organic Frameworks by Silver−Carbon Bonds
Authors:
Li Jiang, Lin Lin, Zihao Wang, Hongyu Ai, Jiangtao Jia,* and Guangshan Zhu*
DOI:10.1021/jacs.4c07945
Links:https://pubs.acs.org/doi/10.1021/jacs.4c07945