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=<p>Magnetocaloric effect (MCE) is one of the most promising features of molecular-based magnetic materials. We reported three Gd-based magnetic refrigerant materials, namely, Gd<sub>2</sub>(L)(NO<sub>3</sub>)(H<sub>2</sub>O)‧CH<sub>3</sub>CN‧H<sub>2</sub>O (<bold>1</bold>, H<sub>2</sub>L = (<italic>Z</italic>)-<italic>N</italic>-[(1<italic>E</italic>)-(2-hydroxy-3-methphenyl)methylidene]pyrazine-2-carbohydrazonic acid), {Gd<sub>6</sub>(L)<sub>6</sub>(CO<sub>3</sub>)<sub>2</sub>(CH<sub>3</sub>OH)<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>Cl}Cl‧4CH<sub>3</sub>CN (<bold>2</bold>), and Gd<sub>8</sub>(L)<sub>8</sub>(CO<sub>3</sub>)<sub>4</sub>(H<sub>2</sub>O)<sub>8</sub>‧2H<sub>2</sub>O (3). Complex <bold>1</bold> contains two Gd<sup>III</sup> ions linked by two <italic>η</italic><sup>2</sup>:<italic>η</italic><sup>1</sup>:<italic>η</italic><sup>1</sup>:<italic>η</italic><sup>1</sup>:<italic>μ</italic><sub>2</sub>-L<sup>2-</sup> ligands, which are seven-coordinated in a capped trigonal prism, and complex <bold>2</bold> possesses six Gd<sup>III</sup> ions, contributing to a triangular prism configuration. For complex <bold>3</bold>, eight Gd<sup>III</sup> 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.</p>