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

A soft phosphorus atom to "harden" an erbium(iii) single-ion magnet.
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DOI:
10.1039/c8sc01626g
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发表时间:
2018-10-14
期刊:
影响因子:
8.4
通讯作者:
Gao S
Gao S
中科院分区:
化学1区
文献类型:
--
作者:
Chen SM;Xiong J;Zhang YQ;Yuan Q;Wang BW;Gao S

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通过用软P原子取代(Cp*)Er(COT)中[Cp*]-的碳原子,获得单离子磁体(Dsp)Er(COT)。弛豫势垒和阻断温度均得到改善。镧系金属有机单离子磁体(SIM)(Cp*)Er(COT)1([Cp*]- =五甲基环戊二烯基; COT 2- =环辛四烯基)具有良好的性能,我们设法用软磷原子取代[Cp*]-环上的一个配位碳原子,得到(Dsp)Er(COT)。(CCDC No.; Dsp- = 3,4-二甲基-2,5-双(三甲基硅基)磷酰基),其夹心结构在本文中首次报道。这种替代导致了磁动力学的显著变化。在零外加直流磁场下,它表现出缓慢的磁弛豫,其能垒(Δ/kB)为358 K,磁滞回线高达9 K,均高于(Cp*)Er(COT)。随着(Dsp)Er(COT)的局域对称性下降,其能垒和阻塞温度(TB)都得到了意想不到的提高,并在Er(iii)基单分子磁体(SMM)中处于最高水平。
A single-ion magnet (Dsp)Er(COT) was obtained by replacing a carbon atom of [Cp*]– in (Cp*)Er(COT) by a soft P atom. Both relaxation barrier and blocking temperature are improved. Beyond the lanthanide organometallic single-ion magnet (SIM) (Cp*)Er(COT)1 ([Cp*]– = pentamethylcyclopentadienide; COT2– = 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. ; ; 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/kB) 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 (TB) both improve unexpectedly and are among the highest ones in Er(iii)-based single-molecule magnets (SMMs).
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