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Crystal Structure and Magnetic Properties of Peacock-Weakley Type Polyoxometalates Na 9 [Ln(W 5 O 18 ) 2 ] (Ln = Tm, Yb): Rare Example of Tm(III) SMM

Abstract : We report Peacock-Weakley complexes, Na 9 [Ln(W 5 O 18) 2 ]·35H 2 O, formed with Tm(III), 1, and Yb(III), 2. Their syntheses, physico-chemical characterizations, crystal structures, and magnetic properties are described. Ab initio calculations are also reported. These polyoxometalate (POM) complexes were obtained using original synthetic conditions where acidification was performed with a stoichiometric amount of nitric acid to an acidity of Z = ν(H +)/ν(WO 4 2-) = 8/10 = 0.80. Both the Tm(III) and Yb(III) derivatives were found to exhibit field-induced slow relaxation of their magnetization likely controlled by Raman and Orbach relaxation processes. 1 is a rare example of a Tm(III)-based single-molecule magnet (SMM) and is a consequence of the oblate tetragonal anti-prismatic symmetry of the coordination sphere.
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Submitted on : Thursday, October 22, 2020 - 4:55:33 PM
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Magnetochemistry 2020, 6, 53.p...
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Oleksandra Mariichak, Sandra Kaabel, Yevgen Karpichev, Georgiy Rozantsev, Serhii Radio, et al.. Crystal Structure and Magnetic Properties of Peacock-Weakley Type Polyoxometalates Na 9 [Ln(W 5 O 18 ) 2 ] (Ln = Tm, Yb): Rare Example of Tm(III) SMM. Magnetochemistry, MDPI, 2020, 6 (4), pp.53. ⟨10.3390/magnetochemistry6040053⟩. ⟨hal-02975464⟩

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