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

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  • Special Topic · Molecular Magnetism
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Abstract

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. χ M T versus T plots for 1 decreased with a decrease in T, which suggests the existence of an antiferromagnetic (AF) interaction between the Dy3+ 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 (Δ/hc) was estimated to be 44 cm−1 with a pre-exponential factor (τ 0) 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.

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Authors and Affiliations

  1. Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi, 980-8578, Japan

    Keiichi Katoh, Kaori Umetsu, K. Breedlove Brian & Masahiro Yamashita

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  1. Keiichi Katoh
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  2. Kaori Umetsu
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  3. K. Breedlove Brian
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  4. Masahiro Yamashita
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Correspondence to Keiichi Katoh or Masahiro Yamashita.

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Katoh, K., Umetsu, K., Breedlove Brian, K. et al. Magnetic relaxation behavior of a spatially closed dysprosium(III) phthalocyaninato double-decker complex. Sci. China Chem. 55, 918–925 (2012). https://doi.org/10.1007/s11426-012-4615-9

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  • DOI: https://doi.org/10.1007/s11426-012-4615-9

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