Experimental Characterization and Theoretical Modeling of a Linear [CoII2TbIII] Single Molecule Magnet

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• 作者：Oleg Reu ; Andrei Palii ; Serghei Ostrovsky ; Warren Wallace ; Oksana Zaharko ; Vadapalli Chandrasekhar ; Rodolphe Clerac ; Sophia Klokishner
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：April 4, 2013
• 年：2013
• 卷：117
• 期：13
• 页码：6880-6888
• 全文大小：381K
• 年卷期：v.117,no.13(April 4, 2013)
• ISSN：1932-7455

文摘

In this report, we present combined experimental and theoretical studies of the trinuclear {[L<sub>2sub>Co<sub>2sub>Tb][NO<sub>3sub>]} (LH<sub>3sub> = (S)P[N(Me)N鈺怌H鈥擟<sub>6sub>H<sub>3sub>-2-OH-3-OMe]<sub>3sub>) complex exhibiting single molecule magnet properties. Our theoretical model includes the axial crystal fields acting on the Tb<sup>IIIsup> and Co<sup>IIsup> ions, the spin鈥搊rbit interaction operating within the <sup>4sup>T<sub>1sub> ground term of the Co<sup>IIsup> ion, and the ferromagnetic exchange between Tb and Co magnetic centers. We demonstrate for the [L<sub>2sub>Co<sub>2sub>Tb]<sup>+sup> complex that the strong negative single-ion anisotropy of both Tb<sup>IIIsup> and Co<sup>IIsup> ions is the reason for the observed slow relaxation of magnetization. The elaborated model describes perfectly the experimental magnetic properties of the complex as a function of temperature and the external magnetic field.