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

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

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

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 P2 1/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 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 (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.

Original languageEnglish
Pages (from-to)918-925
Number of pages8
JournalScience China Chemistry
Volume55
Issue number6
DOIs
Publication statusPublished - 2012 Jun 1

Keywords

  • double-decker complex
  • dysprosium
  • magnetic relaxation process
  • pseudo dinuclear complex
  • single-molecule magnets

ASJC Scopus subject areas

  • Chemistry(all)

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