Abstract
A series of heterometallic 3d-4f hydroxyl sulfate-fluoride compound Ln2Cu(SO4)2(OH)3F·H2O (Ln = Gd, Ho, Yb) are synthesized by a conventional hydrothermal method. All of Ln2Cu(SO4)2(OH)3F·H2O family crystallize in the monoclinic system with a space group of P21/c, where the [CuO6]∞ and [Ln2O12F2]∞ chains are perpendicular to each other, featuring a three-dimensional framework. Magnetic measurements confirm that all of Ln2Cu(SO4)2(OH)3F·H2O family (Ln = Gd, Ho, Yb) exhibit a paramagnetic behavior down to 2 K, where the Weiss temperature θ of near zero, positive, and negative values is observed for Gd, Ho, and Yb-analogues, respectively, due to possibly different 3d-4f spin-orbital couplings.
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