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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
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Transition Metal Coordination Polymers with Trans-1,4-Cyclohexanedicarboxylate: Acidity-Controlled Synthesis,
Pavel A Demakov1,2, Artem S Bogomyakov2,3, Artem S Urlukov1,2
1Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk 630090, Russia.
Materials (Basel, Switzerland)
|January 23, 2020
Summary
Five new metal-organic frameworks using trans-1,4-cyclohexanedicarboxylate (chdc2-) ligands were synthesized. Their structures and magnetic properties were investigated, revealing antiferromagnetic coupling in some manganese-based frameworks.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Crystallography
Background:
- Metal-organic frameworks (MOFs) offer tunable properties for diverse applications.
- Synthesis of MOFs in aqueous systems is environmentally advantageous.
- Controlling crystallization is key to obtaining desired MOF structures.
Purpose of the Study:
- To synthesize novel trans-1,4-cyclohexanedicarboxylate (chdc2-) based MOFs with transition metals.
- To investigate the structural diversity and magnetic properties of these MOFs.
- To explore the thermal stability and decomposition products of selected MOFs.
Main Methods:
- Hydrothermal synthesis in aqueous media.
- pH, temperature, and solvent composition control for directed crystallization.
- Magnetochemical analysis (magnetic susceptibility measurements).
- Thermal decomposition studies followed by X-ray diffraction (XRD) and scanning electron microscopy (SEM).
Main Results:
- Five trans-1,4-cyclohexanedicarboxylate (chdc2-) metal-organic frameworks were successfully synthesized.
- Isostructural 1D chains ([Co(H2O)4(chdc)]n and [Fe(H2O)4(chdc)]n) and 3D frameworks ([Cd(H2O)(chdc)]n∙0.5nCH3CN, [Mn4(H2O)3(chdc)4]n, and [Mn2(Hchdc)2(chdc)]n) were obtained.
- Paramagnetic nature confirmed for compounds 1, 4, and 5, with observed antiferromagnetic exchange in compounds 5 and 4.
- Thermal decomposition yielded cubic Co3O4 and MnO metal oxides.
Conclusions:
- Aqueous synthesis provides a viable route to diverse chdc2- MOFs.
- Structural outcomes are sensitive to synthesis conditions.
- Magnetic properties, including antiferromagnetic coupling, are observed in manganese-based frameworks.
- Decomposition products are characterized metal oxides, indicating potential for MOFs as precursors.
Keywords:
aliphatic ligandscoordination polymersmagnetochemical studymetal oxidesmetal–organic frameworkssynthesisthermolysisMore Related Videos
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