Three Gd-based magnetic refrigerant materials with high magnetic entropy: From di-nuclearity to hexa-nuclearity to octa-nuclearity

Minmin Wang; Chengyuan Sun; Yujia Gao; Hong Xue; Ling Huang; Yutian Xie; Jin Wang; Yuanyuan Peng; Yanfeng Tang

doi:10.3389/fchem.2022.963203

Three Gd-based magnetic refrigerant materials with high magnetic entropy: From di-nuclearity to hexa-nuclearity to octa-nuclearity

Front Chem. 2022 Sep 29:10:963203. doi: 10.3389/fchem.2022.963203. eCollection 2022.

Authors

Minmin Wang¹, Chengyuan Sun¹, Yujia Gao¹, Hong Xue¹, Ling Huang¹, Yutian Xie¹, Jin Wang¹, Yuanyuan Peng², Yanfeng Tang¹

Affiliations

¹ School of Chemistry and Chemical Engineering, Nantong University, Nantong, China.
² Department of Chemistry, Southern University of Science and Technology, Shenzhen, China.

Abstract

Magnetocaloric effect (MCE) is one of the most promising features of molecular-based magnetic materials. We reported three Gd-based magnetic refrigerant materials, namely, Gd₂(L)(NO₃)(H₂O)‧CH₃CN‧H₂O (1, H₂L = (Z)-N-[(1E)-(2-hydroxy-3-methphenyl)methylidene]pyrazine-2-carbohydrazonic acid), {Gd₆(L)₆(CO₃)₂(CH₃OH)₂(H₂O)₃Cl}Cl‧4CH₃CN (2), and Gd₈(L)₈(CO₃)₄(H₂O)₈‧2H₂O (3). Complex 1 contains two Gd^III ions linked by two η ²:η ¹:η ¹:η ¹:μ ₂-L^2- ligands, which are seven-coordinated in a capped trigonal prism, and complex 2 possesses six Gd^III ions, contributing to a triangular prism configuration. For complex 3, eight Gd^III ions form a distorted cube arrangement. Moreover, the large values of magnetic entropy in the three complexes prove to be excellent candidates as cryogenic magnetic coolants.

Keywords: Schiff-based ligand; lanthanide; magnetic entropy; magnetocaloric effect; polynuclear.