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

39 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

All Science Journal Classification (ASJC) codes

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

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