Tuning Luminescent Thermometry in Ytterbium N3O2 Field-Induced Single-Molecule Magnets via Auxiliary Ligands.
5 affiliations
- 1Departamento de Química Inorgánica, Facultade de Química, Universidade de Santiago de Compostela, Santiago de Compostela15782, Spain.
- 2Department of Chemistry "U. Schiff", University of Florence, Sesto Fiorentino50019, Italy.
- 3Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Santiago de Compostela15782, Spain.
- 4Departamento de Química Aplicada, Facultad de Química, Euskal Herriko Unibertsitatea (EHU), Donostia-San Sebastián20018, Spain.
- 5Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avda Fuentenueva s/n, Granada18071, Spain.
Abstract
The reactions of ytterbium(III) bromide or iodide with the N3O2 Schiff base 2,6-bis(2-hydroxyphenyliminomethyl)pyridine (H2L) afford the complexes [Yb(L)Br(CH3CH2OH)]·CH3OH (1·CH3OH) and [Yb(L)(H2O)3]I·CH3CH2OH·H2O (2·CH3CH2OH·H2O), respectively, as single crystals. X-ray diffraction reveals markedly different geometries around the Yb3+ ions. Thus, 1 features a seven-coordinate pentagonal-bipyramidal arrangement, whereas 2 exhibits a triangular dodecahedral environment. Magnetic studies indicate that both compounds exhibit field-induced single-ion magnet (SIM) behavior, with magnetization relaxation governed by quantum tunneling of the magnetization (QTM) and Raman processes. Furthermore, temperature-dependent luminescence measurements demonstrate that both complexes can function as nanoscale luminescent thermometers, resulting in bifunctional magnetic-thermometric molecular materials. Notably, the auxiliary ligands exert a pronounced influence on the thermometric performance while only moderately affecting the magnetic behavior. Complex 1 displays superior thermometric properties, reaching a relative sensitivity of 3.7% K-1 at 60 K, which represents the highest value reported to date for mononuclear Yb3+ field-induced single-ion magnets, together with a minimum temperature uncertainty of 0.2 K. Ab initio calculations provide a theoretical interpretation of both the observed magnetic relaxation dynamics and the luminescence properties.
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BibTeX
@article{oreiromartinez2026tuning,
title = {{Tuning Luminescent Thermometry in Ytterbium N3O2 Field-Induced Single-Molecule Magnets via Auxiliary Ligands.}},
author = {Paula Oreiro-Martínez and Julio Corredoira-Vázquez and Ana M García-Deibe and Javier Cepeda and Enrique Colacio and Federico Totti and Jakob K Staab and Matilde Fondo},
journal = {Inorganic chemistry},
year = {2026},
month = sep,
doi = {10.1021/acs.inorgchem.6c03015},
url = {https://europepmc.org/article/MED/42916511},
note = {CC BY},
}
RIS
TY - JOUR
TI - Tuning Luminescent Thermometry in Ytterbium N3O2 Field-Induced Single-Molecule Magnets via Auxiliary Ligands.
AU - Paula Oreiro-Martínez
AU - Julio Corredoira-Vázquez
AU - Ana M García-Deibe
AU - Javier Cepeda
AU - Enrique Colacio
AU - Federico Totti
AU - Jakob K Staab
AU - Matilde Fondo
PY - 2026
DA - 2026/09/01
JO - Inorganic chemistry
DO - 10.1021/acs.inorgchem.6c03015
UR - https://europepmc.org/article/MED/42916511
AB - The reactions of ytterbium(III) bromide or iodide with the N3O2 Schiff base 2,6-bis(2-hydroxyphenyliminomethyl)pyridine (H2L) afford the complexes [Yb(L)Br(CH3CH2OH)]·CH3OH (1·CH3OH) and [Yb(L)(H2O)3]I·CH3CH2OH·H2O (2·CH3CH2OH·H2O), respectively, as single crystals. X-ray diffraction reveals markedly different geometries around the Yb3+ ions. Thus, 1 features a seven-coordinate pentagonal-bipyramidal arrangement, whereas 2 exhibits a triangular dodecahedral environment. Magnetic studies indicate that both compounds exhibit field-induced single-ion magnet (SIM) behavior, with magnetization relaxation governed by quantum tunneling of the magnetization (QTM) and Raman processes. Furthermore, temperature-dependent luminescence measurements demonstrate that both complexes can function as nanoscale luminescent thermometers, resulting in bifunctional magnetic-thermometric molecular materials. Notably, the auxiliary ligands exert a pronounced influence on the thermometric performance while only moderately affecting the magnetic behavior. Complex 1 displays superior thermometric properties, reaching a relative sensitivity of 3.7% K-1 at 60 K, which represents the highest value reported to date for mononuclear Yb3+ field-induced single-ion magnets, together with a minimum temperature uncertainty of 0.2 K. Ab initio calculations provide a theoretical interpretation of both the observed magnetic relaxation dynamics and the luminescence properties.
SN - 0020-1669
SN - 1520-510X
ER -