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

研究成果: ジャーナルへの寄稿学術誌査読

20 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)5447-5457
ページ数11
ジャーナルInorganic chemistry
53
11
DOI
出版ステータス出版済み - 6月 2 2014

!!!All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学
  • 無機化学

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「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」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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