Strong Ferromagnetic Exchange Coupling and Single-Molecule Magnetism in MoS43–-Bridged Dilanthanide Complexes
Abstract
We report the synthesis and characterization of the trinuclear 4d-4f compounds [Co(C5Me5)2][(C5Me5)2Ln(μ-S)2Mo(μ-S)2Ln(C5Me5)2], 1-Ln (Ln = Y, Gd, Tb, Dy), containing the highly polarizable MoS43- bridging unit. UV-Vis-NIR diffuse reflectance spectra and DFT calculations of 1-Ln reveal a low-energy metal-to-metal charge transfer transition assigned to charge transfer from the singly occupied 4dz2 orbital of MoV to the empty 5d orbitals of the lanthanides (4d in the case of 1-Y), mediated by sulfur-based 3p orbitals. Electron paramagnetic resonance spectra collected for 1-Y in a tetrahydrofuran solution show large 89Y hyperfine coupling constants of A⊥ = 23 MHz and A|| = 26 MHz, indicating the presence of significant yttrium-localized unpaired electron density. Magnetic susceptibility data support similar electron delocalization and ferromagnetic Ln-Mo exchange for 1-Gd, 1-Tb, and 1-Dy. This ferromagnetic exchange gives rise to an S = 15/2 ground state for 1-Gd and one of the largest magnetic exchange constants involving GdIII observed to date, with JGd-Mo = +16.1(2) cm-1. Additional characterization of 1-Tb and 1-Dy by ac magnetic susceptibility measurements reveals that both compounds exhibit slow magnetic relaxation. Although a Raman magnetic relaxation process is dominant for both 1-Tb and 1-Dy, an extracted thermal relaxation barrier of Ueff = 68 cm-1 formore »
- Authors:
-
- University of California, Berkeley, CA (United States)
- University of California, Irvine, CA (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- University of California, Berkeley, CA (United States) ; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, Irvine, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 2282356
- Alternate Identifier(s):
- OSTI ID: 1827991
- Grant/Contract Number:
- SC0018352; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 143; Journal Issue: 22; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Charge transfer; Lanthanides; Ligands; Magnetic properties; Quantum mechanics
Citation Formats
Darago, Lucy E., Boshart, Monica D., Nguyen, Brian D., Perlt, Eva, Ziller, Joseph W., Lukens, Wayne W., Furche, Filipp, Evans, William J., and Long, Jeffrey R. Strong Ferromagnetic Exchange Coupling and Single-Molecule Magnetism in MoS43–-Bridged Dilanthanide Complexes. United States: N. p., 2021.
Web. doi:10.1021/jacs.1c03098.
Darago, Lucy E., Boshart, Monica D., Nguyen, Brian D., Perlt, Eva, Ziller, Joseph W., Lukens, Wayne W., Furche, Filipp, Evans, William J., & Long, Jeffrey R. Strong Ferromagnetic Exchange Coupling and Single-Molecule Magnetism in MoS43–-Bridged Dilanthanide Complexes. United States. https://doi.org/10.1021/jacs.1c03098
Darago, Lucy E., Boshart, Monica D., Nguyen, Brian D., Perlt, Eva, Ziller, Joseph W., Lukens, Wayne W., Furche, Filipp, Evans, William J., and Long, Jeffrey R. Mon .
"Strong Ferromagnetic Exchange Coupling and Single-Molecule Magnetism in MoS43–-Bridged Dilanthanide Complexes". United States. https://doi.org/10.1021/jacs.1c03098. https://www.osti.gov/servlets/purl/2282356.
@article{osti_2282356,
title = {Strong Ferromagnetic Exchange Coupling and Single-Molecule Magnetism in MoS43–-Bridged Dilanthanide Complexes},
author = {Darago, Lucy E. and Boshart, Monica D. and Nguyen, Brian D. and Perlt, Eva and Ziller, Joseph W. and Lukens, Wayne W. and Furche, Filipp and Evans, William J. and Long, Jeffrey R.},
abstractNote = {We report the synthesis and characterization of the trinuclear 4d-4f compounds [Co(C5Me5)2][(C5Me5)2Ln(μ-S)2Mo(μ-S)2Ln(C5Me5)2], 1-Ln (Ln = Y, Gd, Tb, Dy), containing the highly polarizable MoS43- bridging unit. UV-Vis-NIR diffuse reflectance spectra and DFT calculations of 1-Ln reveal a low-energy metal-to-metal charge transfer transition assigned to charge transfer from the singly occupied 4dz2 orbital of MoV to the empty 5d orbitals of the lanthanides (4d in the case of 1-Y), mediated by sulfur-based 3p orbitals. Electron paramagnetic resonance spectra collected for 1-Y in a tetrahydrofuran solution show large 89Y hyperfine coupling constants of A⊥ = 23 MHz and A|| = 26 MHz, indicating the presence of significant yttrium-localized unpaired electron density. Magnetic susceptibility data support similar electron delocalization and ferromagnetic Ln-Mo exchange for 1-Gd, 1-Tb, and 1-Dy. This ferromagnetic exchange gives rise to an S = 15/2 ground state for 1-Gd and one of the largest magnetic exchange constants involving GdIII observed to date, with JGd-Mo = +16.1(2) cm-1. Additional characterization of 1-Tb and 1-Dy by ac magnetic susceptibility measurements reveals that both compounds exhibit slow magnetic relaxation. Although a Raman magnetic relaxation process is dominant for both 1-Tb and 1-Dy, an extracted thermal relaxation barrier of Ueff = 68 cm-1 for 1-Dy is the largest yet reported for a complex containing a paramagnetic 4d metal center. Furthermore, these results provide a potentially generalizable route to enhanced nd-4f magnetic exchange, revealing opportunities for the design of new nd-4f single-molecule magnets and bulk magnetic materials.},
doi = {10.1021/jacs.1c03098},
journal = {Journal of the American Chemical Society},
number = 22,
volume = 143,
place = {United States},
year = {Mon May 24 00:00:00 EDT 2021},
month = {Mon May 24 00:00:00 EDT 2021}
}
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