Magnetic relaxation behavior of a spatially closed dysprosium(Ⅲ) phthalocyaninato double-decker complex

查看全文 作　　者：KATOH [1]Keiichi;UMETSU [1]Kaori;BREEDLOVE BRIAN [1]K.;YAMASHITA [1]Masahiro

机构地区：[1]Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan

出　　处：《Science China Chemistry》索引2012年第55卷第6期,共8页

基　　金：financially supported by a Grant-in-Aid for Scientific Research(s) (20225003) from the Ministry of Education, Culture, Sports,Science, and Technology, Japan 摘　　要：The SMM properties of the spatially closed Dy(Ⅲ) double-decker Pc complex Dy(obPc) 2 (1), which is equivalent to a pseudo dinuclear complex, are reported. Complex 1 crystallized with ethanol in the crystal lattice in the monoclinic space group P21/n and was isomorphous with Tb(obPc) 2 (3), which is arranged in a dimer structure along the b axis. The intermetallic Dy-Dy distance was determined to be 0.756 nm. χM T versus T plots for 1 decreased with a decrease in T, which suggests the existence of an antiferromagnetic (AF) interaction between the Dy 3+ ions. The M-H curve for 1 at 1.8 K showed magnetic hysteresis. In ac susceptibility measurements on a powder sample of 1, which were dependent on the applied ac field, indicating that 1 is an single molecule magnet (SMM), a maximum appeared at 22 K at an ac frequency (f) of 1488 Hz. The shape of the peaks drastically changed, and the peaks did not shift when an H dc large enough to suppress the quantum tunneling of the magnetization (QTM) was applied. The energy barrier (△/hc) was estimated to be 44 cm-1 with a pre-exponential factor (τ0 ) of 1.6 × 10 -5 s from an Arrhenius plot. Our results suggest that the SMM/magnetic properties of 1 significantly change in a dc magnetic field. These relaxation mechanisms are related to the energy gap of the ground state and to QTM. 关键词：镝离子空间群弛豫行为封闭磁化率测量酞菁交流电场单分子磁体

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Magnetic relaxation behavior of a spatially closed dysprosium(Ⅲ) phthalocyaninato double-decker complex

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