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Gadolinium Sulfate Modified by Formate to Obtain Optimized Magneto-Caloric Effect

Gadolinium Sulfate Modified by Formate to Obtain Optimized Magneto-Caloric Effect

Long-Yang Xu, Jiong-Peng Zhao, Ting Liu, Fu-Chen Liu

Inorg Chem. 2015 Jun 1;54(11):5249-56.

PMID: 25978293

Abstract:

Three new Gd(III) based coordination polymers [Gd2(C2H6SO)(SO4)3(H2O)2]n (1), {[Gd4(HCOO)2(SO4)5(H2O)6]·H2O}n (2), and [Gd(HCOO)(SO4)(H2O)]n (3) were obtained by modifying gadolinium sulfate. With the gradual increase of the volume ratio of HCOOH and DMSO in synthesis, the formate anions begin to coordinate with metal centers; this results in the coordination numbers of sulfate anion increasing and the contents of water and DMSO molecules decreasing in target complexes. Accordingly, spin densities both per mass and per volume were enhanced step by step, which are beneficial for the magneto-caloric effect (MCE). Magnetic studies reveal that with the more formate anions present, the larger the negative value of magnetic entropy change (-ΔSm) is. Complex 3 exhibits the largest -ΔSm = 49.91 J kg(-1) K(-1) (189.51 mJ cm(-3) K(-1)) for T = 2 K and ΔH = 7 T among three new complexes.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP155788753	Gadolinium(III) sulfate		155788-75-3	Price

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