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

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

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.963203

DOI=10.3389/fchem.2022.963203

ISSN=2296-2646

ABSTRACT=Magnetocaloric effect (MCE) is one of the most promising features of the molecular-based magnetic materials. Herein, we report three Gd-based magnetic refrigerant materials, 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 GdIII ions linked by two η2:η1:η1:η1:μ2-L2- ligands, which are seven-coordinated in capped trigonal prism, and complex 2 possesses six GdIII ions contributing a triangular prism configuration. For complex 3, eight GdIII ions form a distorted cube arrangement. Moreover, the large values of magnetic entropy in three complexes prove themself to be excellent candidates as cryogenic magnetic coolants.