M(III)Dy(III)3 (M = Fe(III), Co(III)) complexes: three-blade propellers exhibiting slow relaxation of magnetization

Inorganic Chemistry
Gong-Feng XuYang Guo

Abstract

[Dy(III)(HBpz(3))(2)](2+) moieties (HBpz(3)(-) = hydrotris(pyrazolyl)borate) and a 3d transition-metal ion (Fe(III) or Co(III)) have been rationally assembled using an dithiooxalato dianion ligand into 3d-4f [MDy(3)(HBpz(3))(6)(dto)(3)]·4CH(3)CN·2CH(2)Cl(2) (M = Fe (1), Co (2) complexes. Single-crystal X-ray studies reveal that three eight-coordinated Dy(III) centers in a square antiprismatic coordination environment are connecting to a central octahedral trivalent Fe or Co ion forming a propeller-type complex. The dynamics of the magnetization in the two isostructural compounds, modulated by the nature of the central M(III) metal ion, are remarkably different despite their analogous direct current (dc) magnetic properties. The slow relaxation of the magnetization observed for 2 mainly originates from isolated Dy ions, since a diamagnetic Co(III) metal ion links the magnetic Dy(III) ions. In the case of 1, the magnetic interaction between S = 1/2 Fe(III) ion and the three Dy(III) magnetic centers, although weak, generates a complex energy spectrum of magnetic states with low-lying excited states that induce a smaller energy gap than for 2 and thus a faster relaxation of the magnetization.

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Citations

Jun 10, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Namrata SinghGeorge Christou
Jun 10, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Yan-Qiong SunYi-Ping Chen
Mar 15, 2014·Chemical Communications : Chem Comm·Kasper S PedersenRodolphe Clérac
Apr 6, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Susanta HazraSasankasekhar Mohanta
Jul 27, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Qi-Wei XieHui-Zhong Kou
Oct 3, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Gong-Jun ChenYu-Bin Dong
Mar 21, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Jake McGuireJoy H Farnaby
Mar 20, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·M Ramos SilvaJ Martín-Gil
Jun 29, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Qi-Wei XieHui-Zhong Kou

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