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Gonzalez WG, Sakhdari S, Alam MS, Dhulipala G, Kavallieratos K, Miksovska J. DMNP as an Effective Cage for Ln 3+: A Spectroscopic and Thermodynamic Study. Inorg Chem 2024; 63:14366-14374. [PMID: 39041599 DOI: 10.1021/acs.inorgchem.4c00815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
Dimethoxynitrophenyl-EDTA (DMNP) is a popular calcium cage that is frequently used to investigate the role of Ca2+ in signaling processes in vivo. Lanthanides have been used in Ca2+ biomimetics due to similarities in coordination properties of Ln3+ and Ca2+ that may enable fluorescence and NMR studies of functional and structural properties of Ca2+ binding proteins. In this study, we show that Tb3+, Eu3+, and Nd3+ bind strongly to DMNP in a 1:1 ratio. Isothermal titration calorimetric measurements of Ca2+ displacement by Ln3+ in DMNP provide the equilibrium binding constants for Ln3+DMNP complexation with association constants, K11 = (1.2 ± 0.7) × 1012 M-1 for Eu3+, (2.5 ± 1.7) × 1012 M-1 for Nd3+, and (2.8 ± 0.8) × 1012 M-1 for Tb3+. The kinetics and thermodynamics of Ca2+, Mg2+, and Tb3+ release from DMNP were characterized using photothermal beam deflection (PBD). Ligand release from the DMNP cage was rapid and occurred within 10 μs upon cage photofragmentation and was associated with similar reaction volume and enthalpy changes that can be attributed to the photoreleased ion solvation. In the case of Ca2+DMNP photodissociation at subsaturating Ca2+ concentrations, we observed a slower phase with a lifetime of 300 μs that we attribute to Ca2+ rebinding to unphotolyzed DMNP. These results demonstrate that DMNP can serve as an effective photolabile cage for oxophilic Ln3+ that has similar coordination properties to Ca2+ and Mg2+.
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Affiliation(s)
- Walter G Gonzalez
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, Florida 33199, United States
| | - Setareh Sakhdari
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, Florida 33199, United States
| | - Md Shofiul Alam
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, Florida 33199, United States
| | - Gangadhar Dhulipala
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, Florida 33199, United States
| | - Konstantinos Kavallieratos
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, Florida 33199, United States
| | - Jaroslava Miksovska
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, Florida 33199, United States
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Li S, Jansone-Popova S, Jiang DE. Insights into coordination and ligand trends of lanthanide complexes from the Cambridge Structural Database. Sci Rep 2024; 14:11301. [PMID: 38760382 PMCID: PMC11101447 DOI: 10.1038/s41598-024-62074-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Accepted: 05/13/2024] [Indexed: 05/19/2024] Open
Abstract
Understanding lanthanide coordination chemistry can help develop new ligands for more efficient separation of lanthanides for critical materials needs. The Cambridge Structural Database (CSD) contains tens of thousands of single crystal structures of lanthanide complexes that can serve as a training ground for both fundamental chemical insights and future machine learning and generative artificial intelligence models. This work aims to understand the currently available structures of lanthanide complexes in CSD by analyzing the coordination shell, donor types, and ligand types, from the perspective of rare-earth element (REE) separations. We obtain four sets of lanthanide complexes from CSD: Subset 1, all Ln-containing complexes (49472 structures); Subset 2, mononuclear Ln complexes (27858 structures); Subset 3, mononuclear Ln complexes without cyclopentadienyl ligands (Cp) (26156 structures); Subset 4, Ln complexes with at least one 1,10-phenanthroline (phen) or its derivative as a coordinating ligand (2226 structures). The subsequent analysis of lanthanide complexes in these subsets examines the trends in coordination numbers and first shell distances as well as identifies and characterizes the ligands and donor groups. In addition, examples of Ln-complexes with commercially available complexants and phen-based ligands are interrogated in detail. This systematic investigation lays the groundwork for future data-driven ligand designs for REE separations based on the structural insights into the lanthanide coordination chemistry.
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Affiliation(s)
- Shicheng Li
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, 37235, USA
| | - Santa Jansone-Popova
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - De-En Jiang
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, 37235, USA.
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Duvail M, Moreno Martinez D, Žiberna L, Guillam E, Dufrêche JF, Guilbaud P. Modeling Lanthanide Ions in Solution: A Versatile Force Field in Aqueous and Organic Solvents. J Chem Theory Comput 2024. [PMID: 38221754 DOI: 10.1021/acs.jctc.3c01162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2024]
Abstract
In this paper, we propose a new nonpolarizable force field for describing the Ln3+ (Ln = lanthanide) series based on a 12-6-4 Lennard-Jones potential. The development of the force field was performed in pure water by adjusting both the ion-oxygen distance and the hydration free energy. This force field accurately reproduces the Ln3+ hydration properties through the series, especially the coordination number that is hardly accessible using a nonpolarizable force field. Then, the validity and the transferability of the current force field were evaluated for two different systems containing Ln3+ in various solvents, namely, 0.1 mol L-1 La(NO3)3 salts in methanol and Eu(NO3)3 salts in solvent organic phases composed of DMDOHEMA molecules in n-heptane. The good agreement between our simulations and the data available in the literature confirms the accuracy of the force field for describing the lanthanide cations in both aqueous and nonaqueous media.
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Affiliation(s)
- Magali Duvail
- ICSM, University of Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Diego Moreno Martinez
- CEA, DES, ISEC, DMRC, LILA, University of Montpellier, Marcoule, 30207 Bagnols-sur-Cèze, France
| | - Lara Žiberna
- ICSM, University of Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | - Erwann Guillam
- ICSM, University of Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Cèze, France
| | | | - Philippe Guilbaud
- CEA, DES, ISEC, DMRC, University of Montpellier, Marcoule, 30207 Bagnols-sur-Cèze, France
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