Elucidation of Dual Magnetic Relaxation Processes in Dinuclear Dysprosium(III) Phthalocyaninato Triple-Decker Single-Molecule Magnets Depending on the Octacoordination Geometry

Keiichi Katoh, Yu Aizawa, Takaumi Morita, Brian K. Breedlove, Masahiro Yamashita

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

When applying single-molecule magnets (SMMs) to spintronic devices, control of the quantum tunneling of the magnetization (QTM) as well as a spin-lattice interactions are important. Attempts have been made to use not only coordination geometry but also magnetic interactions between SMMs as an exchange bias. In this manuscript, dinuclear dysprosium(III) (DyIII) SMMs with the same octacoordination geometry undergo dual magnetic relaxation processes at low temperature. In the dinuclear DyIII phthalocyaninato (Pc2−) triple-decker type complex [(Pc)Dy(ooPc)Dy(Pc)] (1) (ooPc2−=2,3,9,10,16,17,23,24-octakis(octyloxy)phthalocyaninato) with a square-antiprismatic (SAP) geometry, the ground state is divided by the Zeeman effect, and level intersection occurs when a magnetic field is applied. Due to the ground state properties of 1, since the Zeeman diagram where the levels intersect in an Hdc of 2500 Oe, two kinds of QTM and direct processes occur. However, dinuclear DyIII-Pc systems with C4 geometry, which have a twist angle (ϕ) of less than 45° do not undergo dual magnetic relaxation processes. From magnetic field and temperature dependences, the dual magnetic relaxation processes were clarified.

Original languageEnglish
Pages (from-to)15377-15386
Number of pages10
JournalChemistry - A European Journal
Volume23
Issue number61
DOIs
Publication statusPublished - 2017 Nov 2

Keywords

  • dysprosium
  • magnetic relaxation process
  • octacoordination geometry
  • single-molecule magnets
  • triple-decker complex

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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