The coupling reaction of 2-hydroxy-3-methoxybenzaldehyde with 3-amino-1,2-propanediol under solvothermal conditions gives Schiff-base ligand 3-[(2-hydroxy-3-methoxy)-phenylmethyleneamino]-1,2-propanediol (H3L). Further reaction of a polyhydroxy Schiff-base of H3L with Ln(NO3)3·6H2O and Ni(NO3)2·6H2O in the presence of triethylamine as the base afforded three heterdimetallic clusters with defective dicubic topology, namely, [Ln2Ni2(L)2(μ3-OMe)2(CH3CN)2(NO3)4]·2CH3CN (Ln = Sm (1), Er (2), Gd (3)). They were characterized by single-crystal X-ray diffraction, thermal analysis, IR spectroscopy, elemental analyses, and magnetic susceptibility. The magnetic studies of 1 and 2 revealed the presence of dominant antiferromagnetic interactions, and compound 3 exhibited ferromagnetic coupling and a large magnetocaloric effect with 17.85 J kg−1 K−1 at 2 K for ΔH = 5 T.
Crystal structure Defective dicubic Magnetic properties Magnetocaloric effect
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This work was supported by the National Natural Science Foundation of China (Nos. 21601038 and 51572050), Guangxi Natural Science Foundation (Nos. 2015GXNSFDA139007 and 2016GXNSFAA380085), Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials (EMFM20162107).