Tupolova Yulia P, Shcherbakov Igor N, Popov Leonid D, Lebedev Vladimir E, Tkachev Valery V, Zakharov Konstantin V, Vasiliev Alexander N, Korchagin Denis V, Palii Andrei V, Aldoshin Sergey M
Department of Chemistry, Southern Federal University, 7, Zorge Str., Rostov-on-Don, 344090, Russia.
Dalton Trans. 2019 May 21;48(20):6960-6970. doi: 10.1039/c9dt00770a.
A coordination compound with the composition [CoLCl2]·H2O (L = bis-condensation product of diacetyl and 2-hydrazinyl-4,6-dimethylpyrimidine) was synthesized, in which the Co(ii) ion was hexacoordinated. Under applied DC fields, this compound exhibited single-ion magnet behavior. Two relaxation processes were observed when increasing the applied magnetic field from 1000 to 3200 Oe. The first relaxation (high-frequency) was observed both at 1000 Oe and 3200 Oe, while the second relaxation was only registered under a field of 3200 Oe at low frequencies (<1 Hz) and low temperatures (<5 K). Modeling of the magnetic DC properties using the Griffith Hamiltonian accompanied by quantum chemical calculations revealed easy-axis-type magnetic anisotropy with weak rhombic contributions.
合成了一种组成为[CoLCl₂]·H₂O（L = 二乙酰与2 - 肼基 - 4,6 - 二甲基嘧啶的双缩合产物）的配位化合物，其中Co(ii)离子为六配位。在施加直流磁场时，该化合物表现出单离子磁体行为。当施加磁场从1000奥斯特增加到3200奥斯特时，观察到两个弛豫过程。第一个弛豫（高频）在1000奥斯特和3200奥斯特时均被观察到，而第二个弛豫仅在3200奥斯特的磁场下、低频（<1赫兹）和低温（<5开尔文）时被记录到。使用格里菲斯哈密顿量对直流磁性质进行建模并结合量子化学计算，揭示了具有弱菱形贡献的易轴型磁各向异性。
