“…Ln-based complexes play a critical role in molecular-based materials not only due to the charming geometrical structures but also because of the extensive applications such as luminescence, catalysis, especially for magnetic materials including magnetocaloric effect (MCE) ( Wu D et al, 2020 ; Shang et al, 2021 ; Wei et al, 2021 ), and single-molecule magnets (SMMs) ( Liu et al, 2014 ; Liu et al, 2016 ; Zhang and Cheng, 2016 ; Reis, 2020 ). As a member of the Ln elements, the Gd ion is a perfect candidate in the synthesis of molecular-based magnetic refrigeration materials because of the large magnetothermal effects ( Evangelisti et al, 2011 ; Chen et al, 2013 ; Chen et al, 2014 ; Wang et al, 2020a ; Li et al, 2021 ; Lin et al, 2021 ; Wu T et al, 2021 ; Zhou et al, 2021 ).…”