Exploring Soft Donor Character of the N-2-Pyrazinylmethyl Group by Coordinating Trivalent Actinides and Lanthanides Using Aminopolycarboxylates
Abstract
The trivalent f-element coordination chemistry of a novel aminopolycarboxylate complexant was investigated. The novel reagent is an octadentate complexant that resembles diethylenetriamine-N,N,N',N",N"-pentaacetic acid (DTPA), but a single N-acetate pendant arm was substituted with a N-2-pyrazinylmethyl functional group. Thermodynamic studies of ligand protonation and trivalent lanthanide, americium and curium, complexation by N-2-pyrazinylmethyldiethylenetriamine-N,N',N",N"-tetraacetic acid (DTTA-PzM) emphasize the strong electron withdrawing influence of the N-2-pyrazinylmethyl group. Particularly, DTTA-PzM is more acidic compared to a N-2-pyridinylmethyl-substituted structural equivalent, DTTA-PyM, with a substantial lowering of pK7, corresponding to the protonation of a second aliphatic amine site. The participation of the pyrizyl nitrogen in the metal ion coordination sphere is observed from the fluorescence lifetime decay measurements of metal hydration and the interpretation of the stability constants for ML– and MHL(aq) complexes. The overall conditional stability constants for the trivalent f-element complexation by DTTA-PzM complexes decrease, relative to DTTA-PyM, as expected based on the lower basicity of pyrazine in water relative to pyridine. Replacement of the N-2-pyridinylmethyl group with N-2-pyrazinylmethyl, while enhancing the total acidity of DTTA-PzM, also reduces its softness, as manifested by a small lowering of β101Am/Nd and liquid–liquid separation of trivalent lanthanides from trivalent americium. Despite this, the 4f/5f separation is doubled whenmore »
- Authors:
-
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Idaho National Lab. (INL), Idaho Falls, ID (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
- OSTI Identifier:
- 1591637
- Alternate Identifier(s):
- OSTI ID: 1564174
- Report Number(s):
- INL/JOU-19-55470-Rev000
Journal ID: ISSN 0020-1669; TRN: US2101860
- Grant/Contract Number:
- AC07-05ID14517; AC02-05CH11231; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Inorganic Chemistry
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 1; Journal ID: ISSN 0020-1669
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; aminopolycarboxylates; actinides; lanthanides; metal chelators; aqueous separations
Citation Formats
Grimes, Travis S., Heathman, Colt R., Jansone-Popova, Santa, Ivanov, Alexander S., Bryantsev, Vyacheslav S., and Zalupski, Peter R. Exploring Soft Donor Character of the N-2-Pyrazinylmethyl Group by Coordinating Trivalent Actinides and Lanthanides Using Aminopolycarboxylates. United States: N. p., 2019.
Web. doi:10.1021/acs.inorgchem.9b01427.
Grimes, Travis S., Heathman, Colt R., Jansone-Popova, Santa, Ivanov, Alexander S., Bryantsev, Vyacheslav S., & Zalupski, Peter R. Exploring Soft Donor Character of the N-2-Pyrazinylmethyl Group by Coordinating Trivalent Actinides and Lanthanides Using Aminopolycarboxylates. United States. https://doi.org/10.1021/acs.inorgchem.9b01427
Grimes, Travis S., Heathman, Colt R., Jansone-Popova, Santa, Ivanov, Alexander S., Bryantsev, Vyacheslav S., and Zalupski, Peter R. Tue .
"Exploring Soft Donor Character of the N-2-Pyrazinylmethyl Group by Coordinating Trivalent Actinides and Lanthanides Using Aminopolycarboxylates". United States. https://doi.org/10.1021/acs.inorgchem.9b01427. https://www.osti.gov/servlets/purl/1591637.
@article{osti_1591637,
title = {Exploring Soft Donor Character of the N-2-Pyrazinylmethyl Group by Coordinating Trivalent Actinides and Lanthanides Using Aminopolycarboxylates},
author = {Grimes, Travis S. and Heathman, Colt R. and Jansone-Popova, Santa and Ivanov, Alexander S. and Bryantsev, Vyacheslav S. and Zalupski, Peter R.},
abstractNote = {The trivalent f-element coordination chemistry of a novel aminopolycarboxylate complexant was investigated. The novel reagent is an octadentate complexant that resembles diethylenetriamine-N,N,N',N",N"-pentaacetic acid (DTPA), but a single N-acetate pendant arm was substituted with a N-2-pyrazinylmethyl functional group. Thermodynamic studies of ligand protonation and trivalent lanthanide, americium and curium, complexation by N-2-pyrazinylmethyldiethylenetriamine-N,N',N",N"-tetraacetic acid (DTTA-PzM) emphasize the strong electron withdrawing influence of the N-2-pyrazinylmethyl group. Particularly, DTTA-PzM is more acidic compared to a N-2-pyridinylmethyl-substituted structural equivalent, DTTA-PyM, with a substantial lowering of pK7, corresponding to the protonation of a second aliphatic amine site. The participation of the pyrizyl nitrogen in the metal ion coordination sphere is observed from the fluorescence lifetime decay measurements of metal hydration and the interpretation of the stability constants for ML– and MHL(aq) complexes. The overall conditional stability constants for the trivalent f-element complexation by DTTA-PzM complexes decrease, relative to DTTA-PyM, as expected based on the lower basicity of pyrazine in water relative to pyridine. Replacement of the N-2-pyridinylmethyl group with N-2-pyrazinylmethyl, while enhancing the total acidity of DTTA-PzM, also reduces its softness, as manifested by a small lowering of β101Am/Nd and liquid–liquid separation of trivalent lanthanides from trivalent americium. Despite this, the 4f/5f separation is doubled when DTTA-PzM replaces DTPA as an aqueous complexant in solvent extraction.},
doi = {10.1021/acs.inorgchem.9b01427},
journal = {Inorganic Chemistry},
number = 1,
volume = 59,
place = {United States},
year = {2019},
month = {8}
}
Web of Science
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