Field-induced single-ion magnet behaviors in 1-dimensionally assembled tetrahedral cobalt(II) complexes with halide donors

Ryoji Mitsuhashi, Satoshi Hosoya, Yukinari Sunatsuki, Takayoshi Suzuki, Masahiro Mikuriya

Research output: Contribution to journalArticlepeer-review

Abstract

Three tetrahedral cobalt(II) complexes [CoX2(H2thp)2] were prepared and characterized (H2thp = 2-(1,4,5,6-tetrahydropyrimidin-2-yl)phenol, X = Cl, Br, and I). X-ray crystallographic analysis indicates that the H2thp ligand coordinates to a Co ion in monodentate fashion in zwitterionic form. In the crystal, all the complexes formed characteristic one-dimensional chain structures via N–H···X hydrogen-bonding interactions. The static magnetic measurements showed that the g-factors and axial zero-field splitting parameters for Br and I derivatives are quite similar despite the deference in the halide ligand. A significant frequency dependence was observed for all the complexes in dynamic magnetic measurements in the presence of an external field. The relaxation dynamics below 3 K for the Br and I derivatives were found to be dominated by Raman relaxation process, while that of the Cl derivative was dominated by Orbach process. The relatively long intermolecular Co···Co distances > 8 Å resulted in no influence in the static magnetic properties and the QTM phenomena.

Original languageEnglish
Article number120667
JournalInorganica Chimica Acta
Volume529
DOIs
Publication statusPublished - Jan 1 2022

Keywords

  • Cobalt
  • Hydrogen-bonding interactions
  • Single-ion magnets
  • Supramolecular networks

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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