Lanthanide double-decker complexes functioning as magnets at the single-molecular level
Lanthanide double-decker complexes functioning as magnets at the single-molecular level
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DOI：
10.1021/ja029629n
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发表时间：
2003-07-23
影响因子：
15
通讯作者：
Kaizu, Y
中科院分区：
文献类型：
--
作者：
Ishikawa, N;Sugita, M;Kaizu, Y
双层酞菁配合物与Tb 3+或Dy 3+表现出缓慢的磁化弛豫作为一个单分子的性质。观察到的行为的温度范围远远高于过渡金属簇单分子磁体（SMM）。显著的温度升高是由于弛豫过程中的机制不同于过渡金属簇SMM中的机制。磁矩反转的有效能垒由镧系离子周围的配位场决定，这使最低简并亚态具有大的|JZ|值和大的能量从基态多重态的其余子态分离。
Double-decker phthalocyanine complexes with Tb3+or Dy3+showed slow magnetization relaxation as a single-molecular property. The temperature ranges in which the behavior was observed were far higher than that of the transition-metal-cluster single-molecule magnets (SMMs). The significant temperature rise results from a mechanism in the relaxation process different from that in the transition-metal-cluster SMMs. The effective energy barrier for reversal of the magnetic moment is determined by the ligand field around a lanthanide ion, which gives the lowest degenerate substate a large |Jz| value and large energy separations from the rest of the substates in the ground-state multiplets.