Ligand NMR Chemical Shift Calculations for Paramagnetic Metal Complexes: 5f 1 vs 5f 2 Actinides
Abstract
Ligand paramagnetic NMR (pNMR) chemical shifts of the 5f1 complexes UO2(CO3)35- and NpO2(CO3)34-, and of the 5f2 complexes PuO2(CO3)34- and (C5H5)3UCH3 are investigated by wave function theory calculations, using a recently developed sum-over-states approach within complete active space and restricted active space paradigm including spin–orbit (SO) coupling [J. Phys. Chem. Lett. 2015, 20, 2183-2188]. The experimental 13C pNMR shifts of the actinyl tris-carbonate complexes are well reproduced by the calculations. The results are rationalized by visualizing natural spin orbitals (NSOs) and spin-magnetizations generated from the SO wave functions, in comparison with scalar relativistic spin densities. The analysis reveals a complex balance between spin-polarization, spin and orbital magnetization delocalization, and spin-compensation effects due to SO coupling. This balance creates the magnetization due to the electron paramagnetism around the nucleus of interest, and therefore the pNMR effects. The calculated proton pNMR shifts of the (C5H5)3UCH3 complex are also in good agreement with experimental data. Because of the nonmagnetic ground state of (C5H5)3UCH3, the 1H pNMR shifts arise mainly from the magnetic coupling contributions between the ground state and low-energy excited states belonging to the 5f manifold, along with the thermal population of degenerate excited states at ambient temperatures.
- Authors:
-
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States
- Publication Date:
- Research Org.:
- Univ. at Buffalo, State Univ of New York, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1410732
- Alternate Identifier(s):
- OSTI ID: 1473849
- Grant/Contract Number:
- FG02-09ER16066; SC0001136
- Resource Type:
- Published Article
- Journal Name:
- Journal of Chemical Theory and Computation
- Additional Journal Information:
- Journal Name: Journal of Chemical Theory and Computation Journal Volume: 12 Journal Issue: 11; Journal ID: ISSN 1549-9618
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Gendron, Frédéric, and Autschbach, Jochen. Ligand NMR Chemical Shift Calculations for Paramagnetic Metal Complexes: 5f 1 vs 5f 2 Actinides. United States: N. p., 2016.
Web. doi:10.1021/acs.jctc.6b00462.
Gendron, Frédéric, & Autschbach, Jochen. Ligand NMR Chemical Shift Calculations for Paramagnetic Metal Complexes: 5f 1 vs 5f 2 Actinides. United States. https://doi.org/10.1021/acs.jctc.6b00462
Gendron, Frédéric, and Autschbach, Jochen. Thu .
"Ligand NMR Chemical Shift Calculations for Paramagnetic Metal Complexes: 5f 1 vs 5f 2 Actinides". United States. https://doi.org/10.1021/acs.jctc.6b00462.
@article{osti_1410732,
title = {Ligand NMR Chemical Shift Calculations for Paramagnetic Metal Complexes: 5f 1 vs 5f 2 Actinides},
author = {Gendron, Frédéric and Autschbach, Jochen},
abstractNote = {Ligand paramagnetic NMR (pNMR) chemical shifts of the 5f1 complexes UO2(CO3)35- and NpO2(CO3)34-, and of the 5f2 complexes PuO2(CO3)34- and (C5H5)3UCH3 are investigated by wave function theory calculations, using a recently developed sum-over-states approach within complete active space and restricted active space paradigm including spin–orbit (SO) coupling [J. Phys. Chem. Lett. 2015, 20, 2183-2188]. The experimental 13C pNMR shifts of the actinyl tris-carbonate complexes are well reproduced by the calculations. The results are rationalized by visualizing natural spin orbitals (NSOs) and spin-magnetizations generated from the SO wave functions, in comparison with scalar relativistic spin densities. The analysis reveals a complex balance between spin-polarization, spin and orbital magnetization delocalization, and spin-compensation effects due to SO coupling. This balance creates the magnetization due to the electron paramagnetism around the nucleus of interest, and therefore the pNMR effects. The calculated proton pNMR shifts of the (C5H5)3UCH3 complex are also in good agreement with experimental data. Because of the nonmagnetic ground state of (C5H5)3UCH3, the 1H pNMR shifts arise mainly from the magnetic coupling contributions between the ground state and low-energy excited states belonging to the 5f manifold, along with the thermal population of degenerate excited states at ambient temperatures.},
doi = {10.1021/acs.jctc.6b00462},
journal = {Journal of Chemical Theory and Computation},
number = 11,
volume = 12,
place = {United States},
year = {Thu Oct 06 00:00:00 EDT 2016},
month = {Thu Oct 06 00:00:00 EDT 2016}
}
https://doi.org/10.1021/acs.jctc.6b00462
Web of Science
Works referencing / citing this record:
Computational 1 H NMR: Part 1. Theoretical background
journal, June 2019
- Krivdin, Leonid B.
- Magnetic Resonance in Chemistry, Vol. 57, Issue 11
Computational 1 H NMR: Part 1. Theoretical background
journal, June 2019
- Krivdin, Leonid B.
- Magnetic Resonance in Chemistry, Vol. 57, Issue 11
Remarkable reversal of 13 C-NMR assignment in d 1 , d 2 compared to d 8 , d 9 acetylacetonate complexes: analysis and explanation based on solid-state MAS NMR and computations
journal, January 2020
- Andersen, Anders B. A.; Pyykkönen, Ari; Jensen, Hans Jørgen Aa.
- Physical Chemistry Chemical Physics, Vol. 22, Issue 15