New members of MOF-76 family containing Ho(III) and Tm(III) ions: Characterization, stability and gas adsorption properties

Almáši, Miroslav; Zeleňák, Vladimı́r; Kuchár, Juraj; Bourrelly, Sandrine; Llewellyn, Philip

doi:10.1016/j.colsurfa.2015.10.048

Cited by 48 publications

(35 citation statements)

References 79 publications

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“…As can be seen from Fig. 2, under heating of MOF-76(Gd)-DMF, two phase structure transitions were observed corresponding to phenomenon called "singlecrystal-to-single-crystal transformation" (SCSC) [3,4]. After heating, framework undergoes structural changes upon removal of solvent molecules from tetragonal (20-140…”

Section: Resultsmentioning

confidence: 90%

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Magnetic and Structural Studies into the Effect of Solvent Exchange Process in Metal-Organic Framework MOF-76(Gd)

2017

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Effect of solvent exchange/absence on magnetic and structural properties of microporous metal-organic framework MOF-76(Gd) has been performed. Three compounds have been prepared and characterized: as synthesized MOF-76(Gd)-DMF, which containing DMF (N, N -dimethylformamide) and H2O molecules in the cavity system, activated complex without solvents, MOF-76(Gd) and water exchanged sample MOF-76(Gd)-H2O. The structural study showed that compounds undergo structural changes after activation/exchange processes. Changes were mainly observed in the magnetic properties and distances between Gd. . .Gd ions: 4.718 Å for MOF-76(Gd)-DMF, 4.326 Å for MOF-76(Gd)-H2O and 4.296 Å for MOF-76(Gd). The magnetic properties of the samples were studied by magnetic susceptibility χM (T ) and magnetization M (H). The low positive value of the Weiss constant, Θ = 1.54 K in compound MOF-76(Gd)-DMF shows on a very weak ferromagnetic interaction. On the contrary, the negative values of Θ in complexes MOF-76(Gd) (-5.58 K) and MOF-76(Gd)-H2O (-6.23 K) confirm the existence of antiferromagnetic exchange interaction between Gd(III) ions.

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Section: Resultsmentioning

confidence: 90%

“…These 3D transformable frameworks exhibit permanent porosity and extremely high thermal stability. In our previous work, we have investigated stability and applications of MOF-76 containing Ce(III), Ho(III), Tm(III) and Lu(III) cations [3,4]. Here we continue in our research with gadolinium(III) form namely, {[Gd(BTC)(H 2 O)] · DMF} n .…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Structural Studies into the Effect of Solvent Exchange Process in Metal-Organic Framework MOF-76(Gd)

2017

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“…Over past few decades, compounds formed by an inorganic-organic hybrid structure have impacted the porous materials field, resulting in a group characterized by a metal-organic structure, called metal-organic frameworks (MOFs). [1][2][3] MOFs represent a new class of materials composed of metal centers linked by multi-dentate organic molecules as bridging ligands. Many organic and inorganic compounds can be employed to construct MOFs.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, when performing a heat treatment, it is possible to remove the auxiliary ligands creating active sites (Lewis acid), which are essential for catalysis application. [2][3][4] MOFs are open networks that exhibit crystalline structures, different pore sizes (micro and mesoporous), open metallic sites, active functional groups, low density and large surface area. [4][5][6] Due to this diversity of structures, MOFs have been applied in different areas, such as catalytic reactions, 1 gas storage, 3 luminescent sensors, 7 drug delivery, 8,9 ion exchange, 10 and component separation.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] MOFs are open networks that exhibit crystalline structures, different pore sizes (micro and mesoporous), open metallic sites, active functional groups, low density and large surface area. [4][5][6] Due to this diversity of structures, MOFs have been applied in different areas, such as catalytic reactions, 1 gas storage, 3 luminescent sensors, 7 drug delivery, 8,9 ion exchange, 10 and component separation. 11 MOF-76 represents a family of compounds formed by lanthanide ions and BTC as linker, which was firstly synthesized by Rosi et al 12 and since then it had been synthesized and studied for different applications.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of a Ce-Based MOF-76 with High Yield: A Study of Reaction Parameters Based on a Factorial Design

Santos¹,

Luz²

2020

J. Braz. Chem. Soc.

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The purpose of this work was to optimize the synthesis yield of {[Ce(BTC)(H 2 O)]•DMF} n , a metal-organic framework (MOF)-76 family member, by solvothermal method. CeCl 3 .7H 2 O and 1,3,5-benzenetricarboxylic acid, 2:1 molar proportion, were added to N,N-dimethylformamide (DMF). Reaction time and temperature were evaluated to optimize the synthesis through a factorial design followed by a statistical analysis of the response variable (reaction yield). Infrared spectroscopy (IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) analyses were performed to characterize the obtained white powders. Reaction yield was estimated based on {[Ce(BTC)(H 2 O)]•DMF} n molecular formula, which was confirmed by analytical techniques. The proposed statistic model of the response variable showed good agreement with the experimental values. Temperature parameter was the only significant variable on the reaction yields, being the highest yield (94.4%) obtained at 115 °C for 36 h, and it was accompanied by an improvement on the particle morphology (uniformity of shape and size), forming particles with strawsheave-like morphology.

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Tb and Eu in MOF‐76: Elucidating the Mechanisms Responsible for the Divergent Excellent and Poor Photoluminescence Quantum Yields

Meng,

Zhao,

Busko

et al. 2024

Advanced Optical Materials

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Metal–organic frameworks (MOFs) have emerged as promising hosts for lanthanide ions owing to their ability to sensitize the lanthanides and provide a rigid topology while still permitting interactions with guest species. Among these lanthanide MOFs, MOF‐76 is a noteworthy example composed of 1,3,5‐benzenetricarboxylic acid (H3BTC) and lanthanide ions. In this study, a high photoluminescence quantum yield (ΦPL) of 91% for Tb‐based MOF‐76 (Tb‐MOF) is reported, while the efficiency of Eu‐based MOF‐76 (Eu‐MOF) is over five times lower. A potential circumvention of the poor performance of Eu3+ is energy transfer from Tb3+ to Eu3+, but it is found that although energy transfer is efficient the ΦPL of the Eu3+ remains low. The study investigates the cause of the lower quantum yield in Eu‐MOF by ruling out possible factors such as crystal size, guest solvent molecules, and energy transfer from or back to the linker. None of these are significant loss mechanisms, leading to conclude that the MOF‐76 ligand unfortunately leads to fast non‐radiative deactivation of the Eu3+ excited state. The results suggest that MOF‐76 is an excellent host for Tb3+ ions, but exploration is required for MOF linkers to simply access the potentially excellent emission efficiency of Eu3+ ions.

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New members of MOF-76 family containing Ho(III) and Tm(III) ions: Characterization, stability and gas adsorption properties

Cited by 48 publications

References 79 publications

Magnetic and Structural Studies into the Effect of Solvent Exchange Process in Metal-Organic Framework MOF-76(Gd)

Magnetic and Structural Studies into the Effect of Solvent Exchange Process in Metal-Organic Framework MOF-76(Gd)

Synthesis of a Ce-Based MOF-76 with High Yield: A Study of Reaction Parameters Based on a Factorial Design

Tb and Eu in MOF‐76: Elucidating the Mechanisms Responsible for the Divergent Excellent and Poor Photoluminescence Quantum Yields

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