1
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Leung K, Ilgen AG. Modeling separation of lanthanides via heterogeneous ligand binding. Phys Chem Chem Phys 2024. [PMID: 39018152 DOI: 10.1039/d4cp00880d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/19/2024]
Abstract
Individual lanthanide elements have physical/electronic/magnetic properties that make each useful for specific applications. Several of the lanthanides cations (Ln3+) naturally occur together in the same ores. They are notoriously difficult to separate from each other due to their chemical similarity. Predicting the Ln3+ differential binding energies (ΔΔE) or free energies (ΔΔG) at different binding sites, which are key figures of merit for separation applications, will help design of materials with lanthanide selectivity. We apply ab initio molecular dynamics (AIMD) simulations and density functional theory (DFT) to calculate ΔΔG for Ln3+ coordinated to ligands in water and embedded in metal-organic frameworks (MOFs), and ΔΔE for Ln3+ bonded to functionalized silica surfaces, thus circumventing the need for the computational costly absolute binding (free) energies ΔG and ΔE. Perturbative AIMD simulations of water-inundated simulation cells are applied to examine the selectivity of ligands towards adjacent Ln3+ in the periodic table. Static DFT calculations with a full Ln3+ first coordination shell, while less rigorous, show that all ligands examined with net negative charges are more selective towards the heavier lanthanides than a charge-neutral coordination shell made up of water molecules. Amine groups are predicted to be poor ligands for lanthanide-binding. We also address cooperative ion binding, i.e., using different ligands in concert to enhance lanthanide selectivity.
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Affiliation(s)
- Kevin Leung
- Geochemistry Department, MS 0750, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
| | - Anastasia G Ilgen
- Geochemistry Department, MS 0750, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
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2
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Rimsza JM, Duwal S, Root HD. Impact of Vertex Functionalization on Flexibility of Porous Organic Cages. ACS OMEGA 2024; 9:29025-29034. [PMID: 38973899 PMCID: PMC11223230 DOI: 10.1021/acsomega.4c04186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Revised: 06/05/2024] [Accepted: 06/11/2024] [Indexed: 07/09/2024]
Abstract
Efficient carbon capture requires engineered porous systems that selectively capture CO2 and have low energy regeneration pathways. Porous liquids (PLs), solvent-based systems containing permanent porosity through the incorporation of a porous host, increase the CO2 adsorption capacity. A proposed mechanism of PL regeneration is the application of isostatic pressure in which the dissolved nanoporous host is compressed to alter the stability of gases in the internal pore. This regeneration mechanism relies on the flexibility of the porous host, which can be evaluated through molecular simulations. Here, the flexibility of porous organic cages (POCs) as representative porous hosts was evaluated, during which pore windows decreased by 10-40% at 6 GPa. POCs with sterically smaller functional groups, such as the 1,2-ethane in the CC1 POC resulted in greater imine cage flexibility relative to those with sterically larger functional groups, such as the cyclohexane in the CC3 POC that protected the imine cage from the application of pressure. Structural changes in the POC also caused CO2 adsorption to be thermodynamically unfavorable beginning at ∼2.2 GPa in the CC1 POC, ∼1.1 GPa in the CC3 POC, and ∼1.0 GPa in the CC13 POC, indicating that the CO2 would be expelled from the POC at or above these pressures. Energy barriers for CO2 desorption from inside the POC varied based on the geometry of the pore window and all the POCs had at least one pore window with a sufficiently low energy barrier to allow for CO2 desorption under ambient temperatures. The results identified that flexibility of the CC1, CC3, or CC13 POCs under compression can result in the expulsion of captured gas molecules.
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Affiliation(s)
- Jessica M. Rimsza
- Geochemistry
Department, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Sakun Duwal
- Dynamic
Material Properties Department, Sandia National
Laboratories, Albuquerque, New Mexico 87123, United States
| | - Harrison D. Root
- Advanced
Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
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3
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Orthogonal luminescence lifetime encoding by intermetallic energy transfer in heterometallic rare-earth MOFs. Nat Commun 2023; 14:981. [PMID: 36813785 PMCID: PMC9947006 DOI: 10.1038/s41467-023-36576-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 02/07/2023] [Indexed: 02/24/2023] Open
Abstract
Lifetime-encoded materials are particularly attractive as optical tags, however examples are rare and hindered in practical application by complex interrogation methods. Here, we demonstrate a design strategy towards multiplexed, lifetime-encoded tags via engineering intermetallic energy transfer in a family of heterometallic rare-earth metal-organic frameworks (MOFs). The MOFs are derived from a combination of a high-energy donor (Eu), a low-energy acceptor (Yb) and an optically inactive ion (Gd) with the 1,2,4,5 tetrakis(4-carboxyphenyl) benzene (TCPB) organic linker. Precise manipulation of the luminescence decay dynamics over a wide microsecond regime is achieved via control over metal distribution in these systems. Demonstration of this platform's relevance as a tag is attained via a dynamic double encoding method that uses the braille alphabet, and by incorporation into photocurable inks patterned on glass and interrogated via digital high-speed imaging. This study reveals true orthogonality in encoding using independently variable lifetime and composition, and highlights the utility of this design strategy, combining facile synthesis and interrogation with complex optical properties.
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4
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Rimsza J, Nenoff TM. Design of Enhanced Porous Organic Cage Solubility in Type 2 Porous Liquids. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
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5
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Zhu H, Wang R. Exceptionally high and reversible NO x uptake by hollow Mn-Fe composite nanocubes derived from Prussian blue analogues. NANOSCALE 2023; 15:1709-1717. [PMID: 36594592 DOI: 10.1039/d2nr06502a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Noble metal-based catalysts are widely used as passive NOx adsorbers (PNA) for cold-start NOx emissions; however, efficient porous materials as an alternative have great development potential. Herein, porous Mn-Fe composites with hollow nanocubes derived from Prussian blue analogue (PBA) precursors were used as PNA. The effects of O2, the molar ratio of Mn/Fe, calcination temperature and reaction temperature on their adsorption capacity were explored. The physicochemical properties of the obtained catalysts were systematically characterized by XRD, SEM, BET surface area, TGA, XPS and DRIFT techniques. The developed Mn1Fe2-450 presented excellent NOx uptake (more than 2.16 mmol g-1 at 200 °C). Moreover, a high NOx adsorption performance was also retained in the presence of 10% water vapor. The existing Mn3+ and Fe2+ species could contribute to the NOx adsorption and gaseous O2 can accelerate NO activation to form more easily adsorbed NO2. Surface NO2 is further diffused and stored into the bulk of the Mn-Fe composite in the form of nitrite and nitrate. This work revealed a novel candidate for PNA catalysts, which might provide inspiration for the design of new adsorbent materials.
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Affiliation(s)
- Hongjian Zhu
- School of Environmental Science and Engineering, Shandong University, No. 72 Seaside Road, Qingdao 266237, China.
| | - Rui Wang
- School of Environmental Science and Engineering, Shandong University, No. 72 Seaside Road, Qingdao 266237, China.
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6
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Yang Y, Ibikunle IA, Sava Gallis DF, Sholl DS. Adapting UFF4MOF for Heterometallic Rare-Earth Metal-Organic Frameworks. ACS APPLIED MATERIALS & INTERFACES 2022; 14:54101-54110. [PMID: 36399402 DOI: 10.1021/acsami.2c16726] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Heterometallic metal-organic frameworks based on rare-earth metals (RE-MOFs) have potential in a number of applications where energy transfer between nearby metal atoms is required. This observation implies that it is important to understand the level of local mixing that is achieved between metals of different types during synthesis of RE-MOFs. Density functional theory calculations can give quantitative information on the relative energy of different configurations of RE-MOFs, but these calculations cannot be applied to the full range of medium- and long-range orderings that are possible in heterometallic materials. This limitation can be overcome using force field (FF)-based calculations if appropriate FFs are available. We show that an existing generic FF for MOFs, UFF4MOF, does not accurately predict energies of mixing in heterometallic Nd/Yb MOFs and introduce a modified FF to address this shortcoming. The resulting FF is used to explore metal orderings in large simulation volumes for a Nd/Yb MOF, illustrating the complexities that can arise in the structure of heterometallic RE-MOFs.
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Affiliation(s)
- Yuhan Yang
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Ifayoyinsola A Ibikunle
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Dorina F Sava Gallis
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - David S Sholl
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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7
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Ibikunle IA, Yang Y, Valdez NR, Rodriguez MA, Harvey JA, Sava Gallis DF, Sholl DS. Trends in Siting of Metals in Heterometallic Nd-Yb Metal-Organic Frameworks and Molecular Crystals. ACS APPLIED MATERIALS & INTERFACES 2022; 14:54349-54358. [PMID: 36399403 DOI: 10.1021/acsami.2c15638] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Several studies suggest that metal ordering within metal-organic frameworks (MOFs) is important for understanding how MOFs behave in relevant applications; however, these siting trends can be difficult to determine experimentally. To garner insight into the energetic driving forces that may lead to nonrandom ordering within heterometallic MOFs, we employ density functional theory (DFT) calculations on several bimetallic metal-organic crystals composed of Nd and Yb metal atoms. We also investigate the metal siting trends for a newly synthesized MOF. Our DFT-based energy of mixing results suggest that Nd will likely occupy sites with greater access to electronegative atoms and that local homometallic domains within a mixed-metal Nd-Yb system are favored. We also explore the use of less computationally extensive methods such as classical force fields and cluster expansion models to understand their feasibility for large system sizes. This study highlights the impact of metal ordering on the energetic stability of heterometallic MOFs and crystal structures.
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Affiliation(s)
- Ifayoyinsola A Ibikunle
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Yuhan Yang
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
| | - Nichole R Valdez
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Mark A Rodriguez
- Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Jacob A Harvey
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Dorina F Sava Gallis
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - David S Sholl
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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8
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Christian M, Fritzsching KJ, Harvey JA, Sava Gallis DF, Nenoff TM, Rimsza JM. Dramatic Enhancement of Rare-Earth Metal-Organic Framework Stability Via Metal Cluster Fluorination. JACS AU 2022; 2:1889-1898. [PMID: 36032529 PMCID: PMC9400048 DOI: 10.1021/jacsau.2c00259] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 07/22/2022] [Accepted: 07/22/2022] [Indexed: 05/15/2023]
Abstract
Rare-earth polynuclear metal-organic frameworks (RE-MOFs) have demonstrated high durability for caustic acid gas adsorption and separation based on gas adsorption to the metal clusters. The metal clusters in the RE-MOFs traditionally contain RE metals bound by μ3-OH groups connected via organic linkers. Recent studies have suggested that these hydroxyl groups could be replaced by fluorine atoms during synthesis that includes a fluorine-containing modulator. Here, a combined modeling and experimental study was undertaken to elucidate the role of metal cluster fluorination on the thermodynamic stability, structure, and gas adsorption properties of RE-MOFs. Through systematic density-functional theory calculations, fluorinated clusters were found to be thermodynamically more stable than hydroxylated clusters by up to 8-16 kJ/mol per atom for 100% fluorination. The extent of fluorination in the metal clusters was validated through a 19F NMR characterization of 2,5-dihydroxyterepthalic acid (Y-DOBDC) MOF synthesized with a fluorine-containing modulator. 19F magic-angle spinning NMR identified two primary peaks in the isotropic chemical shift (δiso) spectra located at -64.2 and -69.6 ppm, matching calculated 19F NMR δiso peaks at -63.0 and -70.0 ppm for fluorinated systems. Calculations also indicate that fluorination of the Y-DOBDC MOF had negligible effects on the acid gas (SO2, NO2, H2O) binding energies, which decreased by only ∼4 kJ/mol for the 100% fluorinated structure relative to the hydroxylated structure. Additionally, fluorination did not change the relative gas binding strengths (SO2 > H2O > NO2). Therefore, for the first time the presence of fluorine in the metal clusters was found to significantly stabilize RE-MOFs without changing their acid-gas adsorption properties.
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Affiliation(s)
- Matthew
S. Christian
- Geochemistry
Department, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Keith J. Fritzsching
- Organic
Materials Science Department, Sandia National
Laboratories, Albuquerque, New Mexico 87123, United States
| | - Jacob A. Harvey
- Geochemistry
Department, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Dorina F. Sava Gallis
- Nanoscale
Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Tina M. Nenoff
- Material,
Physical, and Chemical Sciences, Sandia
National Laboratories, Albuquerque, New Mexico 87123, United States
- Tina
M. Nenoff:
| | - Jessica M. Rimsza
- Geochemistry
Department, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
- Jessica M. Rimsza:
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9
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Christian MS, Nenoff TM, Rimsza JM. Discovery of Complex Binding and Reaction Mechanisms from Ternary Gases in Rare Earth Metal–Organic Frameworks. Chemistry 2022; 28:e202201926. [DOI: 10.1002/chem.202201926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Indexed: 11/05/2022]
Affiliation(s)
| | - Tina M. Nenoff
- Material, Chemical, and Physical Sciences Sandia National Laboratories Albuquerque NM 87123 USA
| | - Jessica M. Rimsza
- Geochemistry Department Sandia National Laboratories Albuquerque NM 87123 USA
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10
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Ha NTT, Thao HT, Ha NN. Physisorption and chemisorption of CO2 on Fe-MIL-88B derivatives: Impact of the functional groups on the electronic properties and adsorption tendency - A theoretical investigation. J Mol Graph Model 2022; 112:108124. [DOI: 10.1016/j.jmgm.2022.108124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 01/08/2022] [Accepted: 01/10/2022] [Indexed: 11/30/2022]
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11
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Vogel DJ, Nenoff TM, Rimsza JM. Design Elements for Enhanced Hydrogen Isotope Separations in Barely Porous Organic Cages. ACS OMEGA 2022; 7:7963-7972. [PMID: 35284770 PMCID: PMC8908774 DOI: 10.1021/acsomega.1c07041] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 12/31/2021] [Indexed: 06/02/2023]
Abstract
Barely porous organic cages (POCs) successfully separate hydrogen isotopes (H2/D2) at temperatures below 100 K. Identifying the mechanisms that control the separation process is key to the design of next-generation hydrogen separation materials. Here, ab initio molecular dynamics (AIMD) simulations are used to elucidate the mechanisms that control D2 and H2 separation in barely POCs with varying functionalization. The temperature and pore size dependence were identified, including the selective capture of D2 in three different CC3 structures (RCC3, CC3-S, and 6ET-RCC3). The temperature versus capture trend was reversed for the 6ET-RCC3 structure, identifying that the D2 and H2 escape mechanisms are unique in highly functionalized systems. Analysis of calculated isotope velocities identified effective pore sizes that extend beyond the pore opening distances, resulting in increased capture in minimally functionalized CC3-S and RCC3. In a highly functionalized POC, 6ET-RCC3, higher velocities of the H isotopes were calculated moving through the restricted pore compared to the rest of the system, identifying a unique molecular behavior in the barely nanoporous pore openings. By using AIMD, mechanisms of H2 and D2 separation were identified, allowing for the targeted design of future novel materials for hydrogen isotope separation.
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Affiliation(s)
- Dayton J. Vogel
- Computational
Materials and Data Science Department, Sandia
National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Tina M. Nenoff
- Material,
Physical and Chemical Sciences, Sandia National
Laboratories, Albuquerque, New Mexico 87185, United States
| | - Jessica M. Rimsza
- Geochemistry
Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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12
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Henkelis SE, Vogel DJ, Metz PC, Valdez NR, Rodriguez MA, Rademacher DX, Purdy S, Percival SJ, Rimsza JM, Page K, Nenoff TM. Kinetically Controlled Linker Binding in Rare Earth-2,5-Dihydroxyterepthalic Acid Metal-Organic Frameworks and Its Predicted Effects on Acid Gas Adsorption. ACS APPLIED MATERIALS & INTERFACES 2021; 13:56337-56347. [PMID: 34793131 DOI: 10.1021/acsami.1c17670] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In the pursuit of highly stable and selective metal-organic frameworks (MOFs) for the adsorption of caustic acid gas species, an entire series of rare earth MOFs have been explored. Each of the MOFs in this series (RE-DOBDC; RE = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; DOBDC = 2,5-dihydroxyterepthalic acid) was synthesized in the tetragonal space group I4/m. Crystallized MOF samples, specifically Eu-DOBDC, were seen to have a combination of monodentate and bidentate binding when synthesized under typical reaction conditions, resulting in a contortion of the structure. However, extended crystallization times determined that this binding is kinetically controlled and that the monodentate binding option was crystallographically eliminated by extended reaction times at higher temperatures. Furthermore, this series allows for the direct study of the effect of the metal center on the structure of the of the MOF; herein, the lanthanide metal ionic radii contraction across the periodic table results in a reduction of the MOF pore size and lattice parameters. Scanning electron microscopy-energy-dispersive spectroscopy was used to investigate the stages of crystal growth for these RE-DOBDC MOFs. All MOFs, except Er-DOBDC had a minimum of two stages of growth. These analogues were demonstrated by analysis of neutron diffraction (PND) to exhibit a cooperative rotational distortion of the secondary building unit, resulting in two crystallographically distinct linker sublattices. Computational modeling efforts were used to show distinct differences on acid gas (NO2 and SO2) binding energies for RE-DOBDC MOFs when comparing the monodentate/bidentate combined linker with the bidentate-only linker crystal structures.
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Affiliation(s)
- Susan E Henkelis
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Dayton J Vogel
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Peter C Metz
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Nichole R Valdez
- Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Mark A Rodriguez
- Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - David X Rademacher
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Stephen Purdy
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Stephen J Percival
- Electronic, Optical and Nano Materials Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Jessica M Rimsza
- Geosciences Engineering Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Katharine Page
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Materials Science and Engineering Department, University of Tennessee, Knoxville, Tennessee 37912, United States
| | - Tina M Nenoff
- Material, Physical, and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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13
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Vogel DJ, Rimsza JM, Nenoff TM. Prediction of Reactive Nitrous Acid Formation in Rare-Earth MOFs via ab initio Molecular Dynamics. Angew Chem Int Ed Engl 2021; 60:11514-11522. [PMID: 33690943 PMCID: PMC8252009 DOI: 10.1002/anie.202102956] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Indexed: 01/10/2023]
Abstract
Reactive gas formation in pores of metal-organic frameworks (MOFs) is a known mechanism of framework destruction; understanding those mechanisms for future durability design is key to next generation adsorbents. Herein, an extensive set of ab initio molecular dynamics (AIMD) simulations are used for the first time to predict competitive adsorption of mixed acid gases (NO2 and H2 O) and the in-pore reaction mechanisms for a series of rare earth (RE)-DOBDC MOFs. Spontaneous formation of nitrous acid (HONO) is identified as a result of deprotonation of the MOF organic linker, DOBDC. The unique DOBDC coordination to the metal clusters allows for proton transfer from the linker to the NO2 without the presence of H2 O and may be a factor in DOBDC MOF durability. This is a previously unreported mechanisms of HONO formation in MOFs. With the presented methodology, prediction of future gas interactions in new nanoporous materials can be achieved.
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Affiliation(s)
- Dayton J. Vogel
- Nanoscale Sciences DepartmentSandia National LaboratoriesAlbuquerqueNM87185USA
| | - Jessica M. Rimsza
- Geochemistry DepartmentSandia National LaboratoriesAlbuquerqueNM87185USA
| | - Tina M. Nenoff
- Material, Physical, and Chemical SciencesSandia National LaboratoriesAlbuquerqueNM87185USA
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14
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Vogel DJ, Rimsza JM, Nenoff TM. Prediction of Reactive Nitrous Acid Formation in Rare‐Earth MOFs via ab initio Molecular Dynamics. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102956] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Dayton J. Vogel
- Nanoscale Sciences Department Sandia National Laboratories Albuquerque NM 87185 USA
| | - Jessica M. Rimsza
- Geochemistry Department Sandia National Laboratories Albuquerque NM 87185 USA
| | - Tina M. Nenoff
- Material, Physical, and Chemical Sciences Sandia National Laboratories Albuquerque NM 87185 USA
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15
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Leung K, Ilgen AG, Criscenti LJ. Interplay of physically different properties leading to challenges in separating lanthanide cations - an ab initio molecular dynamics and experimental study. Phys Chem Chem Phys 2021; 23:5750-5759. [PMID: 33662085 DOI: 10.1039/d1cp00031d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lanthanide elements have well-documented similarities in their chemical behavior, which make the valuable trivalent lanthanide cations (Ln3+) particularly difficult to separate from each other in water. In this work, we apply ab initio molecular dynamics simulations to compare the free energies (ΔGads) associated with the adsorption of lanthanide cations to silica surfaces at a pH condition where SiO- groups are present. The predicted ΔGads for lutetium (Lu3+) and europium (Eu3+) are similar within statistical uncertainties; this is in qualitative agreement with our batch adsorption measurements on silica. This finding is remarkable because the two cations exhibit hydration free energies (ΔGhyd) that differ by >2 eV, different hydration numbers, and different hydrolysis behavior far from silica surfaces. We observe that the similarity in Lu3+ and Eu3+ ΔGads is the result of a delicate cancellation between the difference in Eu3+ and Lu3+ hydration (ΔGhyd), and their difference in binding energies to silica. We propose that disrupting this cancellation at the two end points, either for adsorbed or completely desorbed lanthanides (e.g., via nanoconfinment or mixed solvents), will lead to effective Ln3+ separation.
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Affiliation(s)
- Kevin Leung
- Sandia National Laboratories, MS 1415, Albuquerque, NM 87185, USA.
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16
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Henkelis SE, Judge PT, Hayes SE, Nenoff TM. Preferential SO x Adsorption in Mg-MOF-74 from a Humid Acid Gas Stream. ACS APPLIED MATERIALS & INTERFACES 2021; 13:7278-7284. [PMID: 33533240 DOI: 10.1021/acsami.0c21298] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The preferential adsorption of SOx versus water in Mg-MOF-74 from a humid SOx gas stream has been investigated via materials studies and nuclear magnetic resonance (NMR). Mg-MOF-74 has been synthesized and subsequently loaded simultaneously with water vapor and SOx (62-96 ppm) in an adsorption chamber at room temperature over a time period of 4 days with a sample taken every 24 h. Each sample was analyzed by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA)-mass spectrometry, and scanning electron microscopy-energy-dispersive spectroscopy. The metal-organic framework (MOF) showed retained crystallinity and peak intensity in PXRD, and after 2 days, it showed no obvious degradation to the structure. Use of multiple techniques, including TGA, identified 10% by weight of SOx species, specifically H2S and SO2, within the MOF. 1H solid-state NMR shows a substantial reduction of H2O when SOx is present, which is consistent with SOx preferentially binding to the oxophilic metal site of the framework. After 14 weeks aging, the sulfur remains present in the three-dimensional MOF, with only half being desorbed after 23 weeks in air.
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Affiliation(s)
- Susan E Henkelis
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Patrick T Judge
- Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
- Department of Biochemistry, Biophysics & Structural Biology, Washington University in St. Louis, St. Louis, Missouri 63110, United States
| | - Sophia E Hayes
- Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Tina M Nenoff
- Material, Physical, and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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Deneff JI, Butler KS, Rohwer LES, Pearce CJ, Valdez NR, Rodriguez MA, Luk TS, Sava Gallis DF. Encoding Multilayer Complexity in Anti-Counterfeiting Heterometallic MOF-Based Optical Tags. Angew Chem Int Ed Engl 2021; 60:1203-1211. [PMID: 33137241 DOI: 10.1002/anie.202013012] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Indexed: 11/06/2022]
Abstract
Optical tags provide a way to quickly and unambiguously identify valuable assets. Current tag fluorophore options lack the tunability to allow combined methods of encoding in a single material. Herein we report a design strategy to encode multilayer complexity in a family of heterometallic rare-earth metal-organic frameworks based on highly connected nonanuclear clusters. To impart both intricacy and security, a synergistic approach was implemented resulting in both overt (visible) and covert (near-infrared, NIR) properties, with concomitant multi-emissive spectra and tunable luminescence lifetimes. Tag authentication is validated with a variety of orthogonal detection methodologies. Importantly, the effect induced by subtle compositional changes on intermetallic energy transfer, and thus on the resulting photophysical properties, is demonstrated. This strategy can be widely implemented to create a large library of highly complex, difficult-to-counterfeit optical tags.
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Affiliation(s)
- Jacob I Deneff
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA
| | - Kimberly S Butler
- Molecular and Microbiology Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA
| | - Lauren E S Rohwer
- Microsystems Integration Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA
| | - Charles J Pearce
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA
| | - Nichole R Valdez
- Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA
| | - Mark A Rodriguez
- Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA
| | - Ting S Luk
- Nanostructure Physics Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA
| | - Dorina F Sava Gallis
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA
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Deneff JI, Butler KS, Rohwer LES, Pearce CJ, Valdez NR, Rodriguez MA, Luk TS, Sava Gallis DF. Encoding Multilayer Complexity in Anti‐Counterfeiting Heterometallic MOF‐Based Optical Tags. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202013012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jacob I. Deneff
- Nanoscale Sciences Department Sandia National Laboratories Albuquerque NM 87185 USA
| | - Kimberly S. Butler
- Molecular and Microbiology Department Sandia National Laboratories Albuquerque NM 87185 USA
| | - Lauren E. S. Rohwer
- Microsystems Integration Department Sandia National Laboratories Albuquerque NM 87185 USA
| | - Charles J. Pearce
- Nanoscale Sciences Department Sandia National Laboratories Albuquerque NM 87185 USA
| | - Nichole R. Valdez
- Materials Characterization and Performance Department Sandia National Laboratories Albuquerque NM 87185 USA
| | - Mark A. Rodriguez
- Materials Characterization and Performance Department Sandia National Laboratories Albuquerque NM 87185 USA
| | - Ting S. Luk
- Nanostructure Physics Department Sandia National Laboratories Albuquerque NM 87185 USA
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Henkelis SE, Rademacher D, Vogel DJ, Valdez NR, Rodriguez MA, Rohwer LES, Nenoff TM. Luminescent Properties of DOBDC Containing MOFs: The Role of Free Hydroxyls. ACS APPLIED MATERIALS & INTERFACES 2020; 12:22845-22852. [PMID: 32337965 DOI: 10.1021/acsami.0c02829] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A novel metal-organic framework (MOF), Mn-DOBDC, has been synthesized in an effort to investigate the role of both the metal center and presence of free linker hydroxyls on the luminescent properties of DOBDC (2,5-dihydroxyterephthalic acid) containing MOFs. Co-MOF-74, RE-DOBDC (RE-Eu and Tb), and Mn-DOBDC have been synthesized and analyzed by powder X-ray diffraction (PXRD) and the fluorescent properties probed by UV-Vis spectroscopy and density functional theory (DFT). Mn-DOBDC has been synthesized by a new method involving a concurrent facile reflux synthesis and slow crystallization, resulting in yellow single crystals in monoclinic space group C2/c. Mn-DOBDC was further analyzed by single-crystal X-ray diffraction (SCXRD), scanning electron microscopy-energy-dispersive spectroscopy (SEM-EDS), and photoluminescent emission. Results indicate that the luminescent properties of the DOBDC linker are transferred to the three-dimensional structures of both the RE-DOBDC and Mn-DOBDC, which contain free hydroxyls on the linker. In Co-MOF-74 however, luminescence is quenched in the solid state due to binding of the phenolic hydroxyls within the MOF structure. Mn-DOBDC exhibits a ligand-based tunable emission that can be controlled in solution by the use of different solvents.
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Affiliation(s)
- Susan E Henkelis
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - David Rademacher
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Dayton J Vogel
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Nichole R Valdez
- Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Mark A Rodriguez
- Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Lauren E S Rohwer
- Microsystems Integration Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Tina M Nenoff
- Material, Physical, and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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Henkelis SE, Huber DL, Vogel DJ, Rimsza JM, Nenoff TM. Magnetic Tunability in RE-DOBDC MOFs via NO x Acid Gas Adsorption. ACS APPLIED MATERIALS & INTERFACES 2020; 12:19504-19510. [PMID: 32250585 DOI: 10.1021/acsami.0c01813] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The magnetic susceptibility of NOx-loaded RE-DOBDC (rare earth (RE): Y, Eu, Tb, Yb; DOBDC: 2,5-dihydroxyterephthalic acid) metal-organic frameworks (MOFs) is unique to the MOF metal center. RE-DOBDC samples were synthesized, activated, and subsequently exposed to humid NOx. Each NOx-loaded MOF was characterized by powder X-ray diffraction, and the magnetic characteristics were probed by using a VersaLab vibrating sample magnetometer (VSM). Lanthanide-containing RE-DOBDC (Eu, Tb, Yb) are paramagnetic with a reduction in paramagnetism upon adsorption of NOx. Y-DOBDC has a diamagnetic moment with a slight reduction upon adsorption of NOx. The magnetic susceptibility of the MOF is determined by the magnetism imparted by the framework metal center. The electronic population of orbitals contributes to determining the extent of magnetism and change with NOx (electron acceptor) adsorption. Eu-DOBDC results in the largest mass magnetization change upon adsorption of NOx due to more available unpaired f electrons. Experimental changes in magnetic moment were supported by density functional theory (DFT) simulations of NOx adsorbed in lanthanide Eu-DOBDC and transition metal Y-DOBDC MOFs.
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Affiliation(s)
- Susan E Henkelis
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Dale L Huber
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Dayton J Vogel
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Jessica M Rimsza
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Tina M Nenoff
- Material, Physical, and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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Vogel DJ, Nenoff TM, Rimsza JM. Tuned Hydrogen Bonding in Rare-Earth Metal-Organic Frameworks for Design of Optical and Electronic Properties: An Exemplar Study of Y-2,5-Dihydroxyterephthalic Acid. ACS APPLIED MATERIALS & INTERFACES 2020; 12:4531-4539. [PMID: 31905286 DOI: 10.1021/acsami.9b20513] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Organic linkers in metal-organic framework (MOF) materials exhibit differences in hydrogen bonding (H-bonding), which can alter the geometric, electronic, and optical properties of the MOF. Density functional theory (DFT) simulations were performed on a photoluminescent Y-2,5-dihydroxyterephthalic acid (DOBDC) MOF with H-bonding concentrations between 0 and 100%; the H-bonds were located on both bidentate- and monodentate-bound DOBDC linkers. At 0% H-bond concentration in the framework, the lattice parameters contracted, the density increased, and simulated X-ray diffraction patterns shifted. Comparison with published experimental data identified that Y-DOBDC MOF structures must have a degree of H-bond concentration. The concentration of H-bonds in the system shifted the calculated band gap energy from 2.25 eV at 100% to 3.00 eV at 0%. The band gap energies also indicate a distinction of H-bonds formed on bidentate-coordinated linkers compared to those on monodentate linkers. Additionally, when the calculated optical spectra are compared with experimental data, the ligand-to-ligand charge-transfer luminescence in Y-DOBDC MOFs is expected to result from an average of 20-40% H-bonding with at least 50% of the bidentate linkers containing H-bonding. Therefore, the type of H-bonding within the DOBDC linker determines the electronic structure and the optical absorption of the MOF framework structure. Tuning of the H-bonding in rare-earth MOFs provides an opportunity to control the specific optical and adsorption properties of the MOF framework on the basis of reactions between the linker and the environment.
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