Murakami Rina, Ishida Takayuki, Yoshii Shunsuke, Nojiri Hiroyuki
Department of Engineering Science, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
Dalton Trans. 2013 Oct 14;42(38):13968-73. doi: 10.1039/c3dt51784e. Epub 2013 Aug 8.
The crystallographic analysis of the title compound shows that there are two crystallographically independent molecules in a unit cell. The magnetic study clarified that every molecule behaved as a single-molecule magnet. Two series of the out-of-phase ac susceptibility signals appeared around 10 K even at zero dc field. The activation energies (Δ) for the magnetization reversal were estimated as Δ((1))/k(B) = 39.2(3) K with τ0((1)) = 4.2(4) × 10(-8) s and Δ((2))/k(B) = 36(2) K with τ0((2)) = 4.1(12) × 10(-7) s, where τ0 stands for the pre-exponential factor in the Arrhenius analysis. Magnetic hysteresis was recorded at 1.6 K by means of a pulsed-field technique. The role of exchange coupling is discussed.
标题化合物的晶体学分析表明，一个晶胞中有两个晶体学独立的分子。磁性研究表明，每个分子都表现为单分子磁体。即使在零直流场下，在10 K左右也出现了两组异相交流磁化率信号。磁化反转的活化能（Δ）估计为Δ((1))/k(B) = 39.2(3) K，τ0((1)) = 4.2(4) × 10(-8) s，Δ((2))/k(B) = 36(2) K，τ0((2)) = 4.1(12) × 10(-7) s，其中τ0表示阿仑尼乌斯分析中的指数前因子。通过脉冲场技术在1.6 K下记录了磁滞现象。讨论了交换耦合的作用。
