Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-08513-6
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Funding
- European Union's Horizon 2020 research and innovation programme, European Research Council [648295]
- European Union's Horizon 2020 research and innovation programme, Marie Sklodowska-Curie action [748635]
- Deutsche Forschungsgemeinschaft [PO 1602/4-1, 1602/5-1]
- Slovak Research and Development Agency [APVV-15-0053, APVV-17-0513]
- Slovak Scientific Grant Agency VEGA [1/0416/17, 1/0466/18]
- Swiss National Science Foundation (SNF) [206021_150784, 200021L_147201]
- European Union (ERDF)
- Free State of Saxony via the ESF project [100231947]
- Swiss National Science Foundation (SNF) [206021_150784, 200021L_147201] Funding Source: Swiss National Science Foundation (SNF)
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Engineering intramolecular exchange interactions between magnetic metal atoms is a ubiquitous strategy for designing molecular magnets. For lanthanides, the localized nature of 4f electrons usually results in weak exchange coupling. Mediating magnetic interactions between lanthanide ions via radical bridges is a fruitful strategy towards stronger coupling. In this work we explore the limiting case when the role of a radical bridge is played by a single unpaired electron. We synthesize an array of air-stable Ln(2)@C-80(CH2Ph) dimetallofullerenes (Ln(2) = Y-2, Gd-2, Tb-2, Dy-2, Ho-2, Er-2, TbY, TbGd) featuring a covalent lanthanide-lanthanide bond. The lanthanide spins are glued together by very strong exchange interactions between 4f moments and a single electron residing on the metal-metal bonding orbital. Tb-2@C-80(CH2Ph) shows a gigantic coercivity of 8.2 Tesla at 5 K and a high 100-s blocking temperature of magnetization of 25.2 K. The Ln-Ln bonding orbital in Ln(2)@C-80(CH2Ph) is redox active, enabling electrochemical tuning of the magnetism.
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