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Giant coercivity and high magnetic blocking temperatures for N(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation
Increasing the operating temperatures of single-molecule magnets—molecules that can retain magnetic polarization in the absence of an applied field—has potential implications toward information storage and computing, and may also inform the development of new bulk magnets. Progress toward these goal...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5732206/ https://www.ncbi.nlm.nih.gov/pubmed/29247236 http://dx.doi.org/10.1038/s41467-017-01553-w |
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author | Demir, Selvan Gonzalez, Miguel I. Darago, Lucy E. Evans, William J. Long, Jeffrey R. |
author_facet | Demir, Selvan Gonzalez, Miguel I. Darago, Lucy E. Evans, William J. Long, Jeffrey R. |
author_sort | Demir, Selvan |
collection | PubMed |
description | Increasing the operating temperatures of single-molecule magnets—molecules that can retain magnetic polarization in the absence of an applied field—has potential implications toward information storage and computing, and may also inform the development of new bulk magnets. Progress toward these goals relies upon the development of synthetic chemistry enabling enhancement of the thermal barrier to reversal of the magnetic moment, while suppressing alternative relaxation processes. Herein, we show that pairing the axial magnetic anisotropy enforced by tetramethylcyclopentadienyl (Cp(Me4H)) capping ligands with strong magnetic exchange coupling provided by an N(2) (3−) radical bridging ligand results in a series of dilanthanide complexes exhibiting exceptionally large magnetic hysteresis loops that persist to high temperatures. Significantly, reducing the coordination number of the metal centers appears to increase axial magnetic anisotropy, giving rise to larger magnetic relaxation barriers and 100-s magnetic blocking temperatures of up to 20 K, as observed for the complex [K(crypt-222)][(Cp(Me4H) (2)Tb)(2)(μ−[Formula: see text] )]. |
format | Online Article Text |
id | pubmed-5732206 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-57322062017-12-18 Giant coercivity and high magnetic blocking temperatures for N(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation Demir, Selvan Gonzalez, Miguel I. Darago, Lucy E. Evans, William J. Long, Jeffrey R. Nat Commun Article Increasing the operating temperatures of single-molecule magnets—molecules that can retain magnetic polarization in the absence of an applied field—has potential implications toward information storage and computing, and may also inform the development of new bulk magnets. Progress toward these goals relies upon the development of synthetic chemistry enabling enhancement of the thermal barrier to reversal of the magnetic moment, while suppressing alternative relaxation processes. Herein, we show that pairing the axial magnetic anisotropy enforced by tetramethylcyclopentadienyl (Cp(Me4H)) capping ligands with strong magnetic exchange coupling provided by an N(2) (3−) radical bridging ligand results in a series of dilanthanide complexes exhibiting exceptionally large magnetic hysteresis loops that persist to high temperatures. Significantly, reducing the coordination number of the metal centers appears to increase axial magnetic anisotropy, giving rise to larger magnetic relaxation barriers and 100-s magnetic blocking temperatures of up to 20 K, as observed for the complex [K(crypt-222)][(Cp(Me4H) (2)Tb)(2)(μ−[Formula: see text] )]. Nature Publishing Group UK 2017-12-15 /pmc/articles/PMC5732206/ /pubmed/29247236 http://dx.doi.org/10.1038/s41467-017-01553-w Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Demir, Selvan Gonzalez, Miguel I. Darago, Lucy E. Evans, William J. Long, Jeffrey R. Giant coercivity and high magnetic blocking temperatures for N(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation |
title | Giant coercivity and high magnetic blocking temperatures for N(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation |
title_full | Giant coercivity and high magnetic blocking temperatures for N(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation |
title_fullStr | Giant coercivity and high magnetic blocking temperatures for N(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation |
title_full_unstemmed | Giant coercivity and high magnetic blocking temperatures for N(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation |
title_short | Giant coercivity and high magnetic blocking temperatures for N(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation |
title_sort | giant coercivity and high magnetic blocking temperatures for n(2)(3−) radical-bridged dilanthanide complexes upon ligand dissociation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5732206/ https://www.ncbi.nlm.nih.gov/pubmed/29247236 http://dx.doi.org/10.1038/s41467-017-01553-w |
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