Binuclear Gadolinium Complex by One‐Pot Method: Structure and Magnetic Property

Two binuclear Gadolinium(III) (Gd) complex [Gd 2 ( L1 ) 2 (H 2 L3 ) 2 (NO 3 ) 2 ] ( 1 ) and [Gd 2 ( L2 ) 2 (H 2 L3 ) 2 (NO 3 ) 2 ] ( 2 ) were obtained by using 2‐hydroxybenzaldehyde or 2‐hydroxy‐1‐naphthaldehyde, 2‐aminophenol, pyridin‐2‐ylmethanamine and Gd(NO 3 ) 3 ⋅ 6H 2 O in CH 3 CN (H 2 L1 =( E )‐2‐((2‐hydroxybenzylidene)amino)phenol, H 2 L2 =( E )‐1‐(((2‐hydroxyphenyl)imino)methyl)naphthalen‐2‐ol, H 2 L3 =pyridin‐2‐ylmethanamine). Structural analysis suggests that all the ligands as protective units protect the central Gd(III) ions at the periphery. Magnetization studies exhibited magnetocaloric effect of 14.45 J ⋅ kg −1 ⋅ K −1 at 4 K under Δ H =7 T for complex 1 and 12.69 J ⋅ kg −1 ⋅ K −1 at 2 K under Δ H =7 T for complex 2 . In complexes 1 and 2 , although the coordination configurations are the same, the significant difference in MCE may be due to the adjustments of the peripheral ligands leading to changes in the coordination field strength. The electron affinity of the ligands can impact the interaction between the ligands and Gd(III) ions.