Synthesis, structure and magnetic properties of tris(pyrazolyl)methane lanthanide complexes: effect of the anion on the slow relaxation of magnetization†,Dalton Transactions

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Synthesis, structure and magnetic properties of tris(pyrazolyl)methane lanthanide complexes: effect of the anion on the slow relaxation of magnetization†
Dalton Transactions ( IF 3.5 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1039/c8dt00458g
Jérôme Long _{1,

2,

3,

4,

5} , Dimitry M. Lyubov _{6,

7,

8,

9,

10} , Tatyana V. Mahrova _{6,

7,

8} , Anton V. Cherkasov _{6,

7,

8} , Georgy K. Fukin _{6,

7,

8} , Yannick Guari _{1,

2,

3,

4,

5} , Joulia Larionova _{1,

2,

3,

4,

5} , Alexander A. Trifonov _{6,

7,

8,

9,

10}

Affiliation

We report on the synthesis, structure and investigation of magnetic properties of a series of six heteroleptic complexes of the general formula [Ln(Tpm)X₃]·yMeCN (Tpm = tris(3,5-dimethylpyrazolyl)methane; Ln = Tb, Dy, Er; X⁻ = NO₃⁻, Cl⁻ and y = 1 or 2). We demonstrate that the observation of a field-induced slow relaxation of magnetization is highly dependent on the anion's nature. While nitrate moieties appear to be suitable to stabilize the oblate electronic density of Dy³⁺, chloride ions generate an equatorial crystal-field allowing the slow relaxation of the prolate Er³⁺ ions.

中文翻译：

三（吡唑基）甲烷镧系元素配合物的合成，结构和磁性能：阴离子对磁化慢弛豫的影响†

我们报告了一系列六种通式[Ln（Tpm）X ₃ ]· y MeCN（Tpm =三（3,5-二甲基吡唑基）甲烷; Ln = Tb ，镝，铒; X ^- = NO ₃^-，氯^-和ÿ = 1或2）。我们证明，磁场诱导的磁化慢弛豫的观察高度依赖于阴离子的性质。尽管硝酸根部分似乎适合稳定Dy ³⁺的扁桃电子密度，但氯离子会产生赤道晶体场，从而使扁长的Er ³⁺离子缓慢弛豫。

更新日期：2018-03-02

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