An air-stable Dy(III) single-ion magnet with high anisotropy barrier and blocking temperature
Chemical Science, ISSN: 2041-6539, Vol: 7, Issue: 8, Page: 5181-5191
2016
- 478Citations
- 139Captures
- 4Mentions
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Metrics Details
- Citations478
- Citation Indexes478
- 478
- CrossRef470
- Captures139
- Readers139
- 139
- Mentions4
- References4
- 4
Article Description
Herein we report air-stable Dy(iii) and Er(iii) single-ion magnets (SIMs) with pseudo-D symmetry, synthesized from a sterically encumbered phosphonamide, BuPO(NHPr), where the Dy(iii)-SIM exhibits a magnetization blocking (T) up to 12 K, defined from the maxima of the zero-field cooled magnetization curve, with an anisotropy barrier (U) as high as 735.4 K. The Dy(iii)-SIM exhibits a magnetic hysteresis up to 12 K (30 K) with a large coercivity of ∼0.9 T (∼1.5 T) at a sweep rate of ∼0.0018 T s (0.02 T s). These high values combined with persistent stability under ambient conditions, render this system as one of the best-characterized SIMs. Ab initio calculations have been used to establish the connection between the higher-order symmetry of the molecule and the quenching of quantum tunnelling of magnetization (QTM) effects. The relaxation of magnetization is observed via the second excited Kramers doublet owing to pseudo-high-order symmetry, which quenches the QTM. This study highlights fine-tuning of symmetry around the lanthanide ion to obtain new-generation SIMs and offers further scope for pushing the limits of U and T using this approach.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84979200956&origin=inward; http://dx.doi.org/10.1039/c6sc00279j; http://www.ncbi.nlm.nih.gov/pubmed/30155168; http://xlink.rsc.org/?DOI=C6SC00279J; http://pubs.rsc.org/en/content/articlepdf/2016/SC/C6SC00279J; https://xlink.rsc.org/?DOI=C6SC00279J; https://dx.doi.org/10.1039/c6sc00279j; https://pubs.rsc.org/en/content/articlelanding/2016/sc/c6sc00279j
Royal Society of Chemistry (RSC)
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