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

We report on the synthesis, structure and investigation of magnetic properties of a series of six heteroleptic complexes of the general formula [Ln(Tpm)X 3 ]· y MeCN (Tpm = tris(3,5-dimethylpyrazolyl)methane; Ln = Tb, Dy, Er; X − = NO 3 − , Cl − and y = 1 or 2). We demonstrate that the observation o...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2018, Vol.47 (15), p.5153-5156
Main Authors: Long, Jérôme, Lyubov, Dimitry M, Mahrova, Tatyana V, Cherkasov, Anton V, Fukin, Georgy K, Guari, Yannick, Larionova, Joulia, Trifonov, Alexander A
Format: Article
Language:English
Subjects:
Anions
Chemical Sciences
Chloride ions
Coordination chemistry
Dysprosium
Erbium
Magnetic properties
Magnetism
Magnetization
Methane
Synthesis
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Summary:We report on the synthesis, structure and investigation of magnetic properties of a series of six heteroleptic complexes of the general formula [Ln(Tpm)X 3 ]· y MeCN (Tpm = tris(3,5-dimethylpyrazolyl)methane; Ln = Tb, Dy, Er; X − = NO 3 − , 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 Dy 3+ , chloride ions generate an equatorial crystal-field allowing the slow relaxation of the prolate Er 3+ ions. Synthesis and magnetic properties of tris(pyrazolyl)methane lanthanide complexes.
ISSN:1477-9226
1477-9234
DOI:10.1039/c8dt00458g