Tetranuclear heterometallic cycle Dy2Cu2 and the corresponding polymer showing slow relaxation of magnetization reorientation

Sohei Ueki, Atsushi Okazawa, Takayuki Ishida, Takashi Nogami, Hiroyuki Nojiri

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We prepared tetranuclear complexes [{Cu(emg)(Hemg)(ROH)}2{Dy(hfac)2(ROH)}2] (abbreviated as [Dy2Cu2]-R; R = Me, Et; H2emg = ethylmethylglyoxime) and the corresponding polymer [{Cu(dmg)(Hdmg)}2{Dy(hfac)2(CH3OH)}2]n · 2(MeOH) ([Dy2Cu2]n; H2dmg = dimethylglyoxime), which were characterized as analogs of the known [Gd2Cu2] monomer and polymer, respectively, by means of X-ray crystallographic analysis. The M-H curves clarified antiferromagnetic coupling between Dy and Cu in the [Dy2Cu2] motif, leading to the Dy magnetic moments aligned parallel ([Cu(↓)Dy(↑)Cu(↓)Dy(↑)]). Ac magnetic susceptibility measurements of [Dy2Cu2]-Me and [Dy2Cu2]n exhibited a χac (in-phase) decrease and a concomitant χac (out-of-phase) increase with an increase of frequency. Low-temperature magnetization measurements on [Dy2Cu2]n exhibited magnetic hysteresis, which is characteristic of single-chain magnets.

Original languageEnglish
Pages (from-to)1970-1976
Number of pages7
JournalPolyhedron
Volume26
Issue number9-11
DOIs
Publication statusPublished - 2007 Jun 15

Keywords

  • Copper
  • Dysprosium
  • Magnetic measurements
  • Single-chain magnet
  • Single-molecule magnet

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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