A soft phosphorus atom to "harden" an erbium(iii) single-ion magnet

Beyond the lanthanide organometallic single-ion magnet (SIM) (Cp*)Er(COT) ([Cp*] = pentamethylcyclopentadienide; COT = cyclooctatetraenide) that has a good performance, we managed to replace one coordinated carbon atom on the [Cp*] ring by a soft phosphorus atom and obtained (Dsp)Er(COT) (CCDC No. ;...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2018-10, Vol.9 (38), p.7540-7545
Main Authors: Chen, Shi-Ming, Xiong, Jin, Zhang, Yi-Quan, Yuan, Qiong, Wang, Bing-Wu, Gao, Song
Format: Article
Language:English
Subjects:
Crystallography
Direct current
Erbium
Hysteresis
Magnetic induction
Magnetic relaxation
Magnets
Phosphorus
Sandwich structures
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Summary:Beyond the lanthanide organometallic single-ion magnet (SIM) (Cp*)Er(COT) ([Cp*] = pentamethylcyclopentadienide; COT = cyclooctatetraenide) that has a good performance, we managed to replace one coordinated carbon atom on the [Cp*] ring by a soft phosphorus atom and obtained (Dsp)Er(COT) (CCDC No. ; 1835955; Dsp = 3,4-dimethyl-2,5-bis(trimethylsilyl)phospholyl) whose sandwich structure is reported here for the first time. This substitution results in a remarkable change of magnetic dynamics. It exhibits slow magnetic relaxation under a zero applied direct current (DC) magnetic field with an energy barrier (Δ/ ) of 358 K and magnetic hysteresis up to 9 K, both of which are higher than those of (Cp*)Er(COT). With the descended local symmetry of (Dsp)Er(COT), the energy barrier and blocking temperature ( ) both improve unexpectedly and are among the highest ones in Er(iii)-based single-molecule magnets (SMMs).
ISSN:2041-6520
2041-6539
DOI:10.1039/c8sc01626g