Journal Article

PUBDB-2025-00270

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Neutral and Ionic Co(II) Metal-Organic Frameworks with 2-Methylimidazole and Trimesate: Design and Evaluation for Molecule Encapsulation and Slow Release

Velazquez Garcia, J. (Corresponding author)Extern*XFEL.EU*DESY* ; Del los Santos Valladares, L. ; Barnes, C. H. W. ; König, S. ; Froeba, M.Extern* ; Baran, V.Extern*DESY* ; Knjo, B.Extern* ; Khademhir, F.Extern* ; Ekineken, A.Extern* ; Hain, F.Extern* ; Carstensen, E.Extern* ; Spillner, T.Extern* ; Asprilla Herrera, L. M.Extern*DESY* ; Lukaszczyk, W.Extern*DESY* ; Techert, S.XFEL.EU*DESY*

2025
Soc. London

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Please use a persistent id in citations: doi:10.1039/D4DT02679A  doi:10.3204/PUBDB-2025-00270

Abstract: Two Co(II) mixed-ligand metal-organic frameworks (MOFs) based on 2-methylimidazole and trimesate were synthesised at room temperature. The structure and properties of the two MOFs, named material Deutsches Elektronen Synchrotron-1 and -2 (mDESY-1 and mDESY-2), were verified by single crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), SQUID magnetic susceptibility and N2 adsorption. The structural analysis indicates that mDESY-1 is a 3D ionic framework with 2-methyl-1H-imidazol-3-ium counterions residing in its pores, while mDESY-2 is a 2D neutral framework isostructural to ITH-1, with water as a co-crystallising solvent. PXRD data demonstrates that mDESY-1 exhibits better crystallinity than mDESY-2. Magnetic measurements indicate that both MOFs are paramagnetic with a weak ferromagnetic transition above room temperature. Although both structures suggest the presence of voids, N2 adsorption data confirms that these voids are not accessible in either MOF. Nevertheless, mDESY-1 was capable of encapsulating azobenzene during synthesis, which was observed via SCXRD. The encapsulated molecules were then slowly released in ethanol, with a release of up to 30mg of azobenzene per g of MOF in a period of 60 days.

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Contributing Institute(s):

1. Strukturdynamik Chemischer Systeme (FS-SCS)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project G:(GEPRIS)217133147 - SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen (217133147) (217133147)
4. SFB 1073 B06 - Echtzeituntersuchungen der optischen Anregung in oligonuklearen Metallkomplexen mit schaltbaren Spin- und Ladungszuständen (B06) (240171831) (240171831)
5. DFG project G:(GEPRIS)510228793 - SFB 1633: Elektronenverschiebung durch Protonen – Vereinigende Strategien für die Mehrelektronenredoxkatalyse durch protonengekoppelten Elektronentransfer (510228793) (510228793)

Experiment(s):

1. PETRA Beamline P11 (PETRA III)
2. PETRA Beamline P02.1 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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