Luminescent and Magnetic Tb-MOF Flakes Deposited on Silicon

The synthesis of a terbium-based 2D metal–organic framework (MOF), of formula [Tb(MeCOO)(PhCOO)2] (1), a crystalline material formed by neutral nanosheets held together by Van der Waals interactions, is presented. The material can be easily exfoliated by sonication and deposited onto different subst...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2021-09, Vol.26 (18), p.5503
Main Authors: Bartolomé, Elena, Arauzo, Ana, Herce, Sergio, Palau, Anna, Mestres, Narcis, Fuertes, Sara, Sevilla, Pablo, Settineri, Nicholas S., Navarro-Spreafico, Laura, González, Jonay, Sañudo, E. Carolina
Format: Article
Language:English
Subjects:
2D MOFs
Anisotropy
Biochemistry & Molecular Biology
Chemistry
Crystal structure
Exfoliation
Experiments
Flakes
Graphene
lanthanides
Ligands
luminescence
magnetic anisotropy
Magnetic fields
Magnetic properties
Magnetization
Metal-organic frameworks
Multifunctional materials
Photoluminescence
Photons
Radiation
Relaxation time
Silicon
Silicon wafers
Sonication
Spin coating
Substrates
Terbium
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Summary:The synthesis of a terbium-based 2D metal–organic framework (MOF), of formula [Tb(MeCOO)(PhCOO)2] (1), a crystalline material formed by neutral nanosheets held together by Van der Waals interactions, is presented. The material can be easily exfoliated by sonication and deposited onto different substrates. Uniform distributions of Tb-2D MOF flakes onto silicon were obtained by spin-coating. We report the luminescent and magnetic properties of the deposited flakes compared with those of the bulk. Complex 1 is luminescent in the visible and has a sizeable quantum yield of QY = 61% upon excitation at 280 nm. Photoluminescence measurements performed using a micro-Raman set up allowed us to characterize the luminescent spectra of individual flakes on silicon. Magnetization measurements of flakes-on-silicon with the applied magnetic field in-plane and out-of-plane display anisotropy. Ac susceptibility measurements show that 1 in bulk exhibits field-induced slow relaxation of the magnetization through two relaxation paths and the slowest one, with a relaxation time of τlf ≈ 0.5 s, is assigned to a direct process mechanism. The reported exfoliation of lanthanide 2D-MOFs onto substrates is an attractive approach for the development of multifunctional materials and devices for different applications.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules26185503