Magnetic properties of 1:2 mixed cobalt(II) salicylaldehyde schiff-base complexes with pyridine ligands carrying high-spin carbenes (S car = 2/2, 4/2, 6/2, and 8/2) in dilute frozen solutions: Role of organic spin in heterospin single-molecule magnets

Satoru Karasawa, Kimihiro Nakano, Daisuke Yoshihara, Noriko Yamamoto, Jun Ichi Tanokashira, Takahito Yoshizaki, Yuji Inagaki, Noboru Koga

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The 1:2 mixtures of Co(p-tolsal)2, p-tolsal = N-p-tolylsalicylideniminato, and diazo-pyridine ligands, DXpy; X = 1, 2, 3l, 3b, and 4, in MTHF solutions were irradiated at cryogenic temperature to form the corresponding 1:2 cobalt-carbene complexes Co(p-tolsal)2(CXpy) 2, with Stotal = 5/2, 9/2, 13/2, 13/2, and 17/2, respectively. The resulting Co(p-tolsal)2(CXpy)2, X = 1, 2, 3l, 3b, and 4, showed magnetic behaviors characteristic of heterospin single-molecule magnets with effective activation barriers, U eff/kB, of 40, 65, 73, 72, and 74 K, for reorientation of the magnetic moment and temperature-dependent hysteresis loops with a coercive force, Hc, of ∼0, 6.2, 10, 6.5, and 9.0 kOe at 1.9 K, respectively. The relaxation times, τQ, due to a quantum tunneling of magnetization (QTM) were estimated to be 1.6 s for Co(p-tolsal)2(C1py)2, ∼2.0 × 103 s for Co(p-tolsal)2(C2py)2, and >105 s for Co(p-tolsal)2(CXpy)2; X = 3b, 3l, and 4. In heterospin complexes, organic spins, carbenes interacted with the cobalt ion to suppress the QTM pathway, and the τQ value increased with increasing the Stotal values.

Original languageEnglish
Pages (from-to)5447-5457
Number of pages11
JournalInorganic chemistry
Volume53
Issue number11
DOIs
Publication statusPublished - Jun 2 2014

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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