Bistability of magnetization without spin-transition in a high-spin cobalt(II) complex due to angular momentum quenching

Gergely Juhász, Ryotaro Matsuda, Shinji Kanegawa, Kaori Inoue, Osamu Sato, Kazunari Yoshizawa

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

[Co(NO3)2L] (L: 2,6-di(pyrazol-1-yl)pyrazine) (1) exhibits an abrupt transition with hysteresis in magnetic susceptibility between 228 and 240 K. The results of spectroscopic and XRD measurements showed that 1 is in the high spin state in the whole temperature range. Therefore the observed hysteresis is not due to a spin transition but corresponds to a partial quenching of the angular momentum contribution to the magnetic susceptibility. Crystallographic measurements on the low- and high-temperature form of 1, combined with DFT calculations, showed that a symmetric twisting of the coordinating nitrate ions upon the transition is the most important factor in the orbital quenching mechanism. Utilizing such quenching to control magnetic properties can be a new approach to engineer transition metal complexes with magnetic functionalities without changing their spin or oxidation state.

Original languageEnglish
Pages (from-to)4560-4561
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number13
DOIs
Publication statusPublished - Apr 8 2009

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Angular momentum
Cobalt
Quenching
Magnetization
Magnetic susceptibility
Temperature
Hysteresis
Pyrazines
Coordination Complexes
Metal complexes
Discrete Fourier transforms
Nitrates
Transition metals
Magnetic properties
Ions
Engineers
Oxidation

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Bistability of magnetization without spin-transition in a high-spin cobalt(II) complex due to angular momentum quenching. / Juhász, Gergely; Matsuda, Ryotaro; Kanegawa, Shinji; Inoue, Kaori; Sato, Osamu; Yoshizawa, Kazunari.

In: Journal of the American Chemical Society, Vol. 131, No. 13, 08.04.2009, p. 4560-4561.

Research output: Contribution to journalArticle

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