Structures and magnetic properties of two series of Schiff base binuclear lanthanide complexes |
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| Authors: | Ying Lu Zhong-Ming Huang Hua-Hong Zou Fu-Pei Liang |
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| Institution: | 1. School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, China;2. School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, China
Contribution: Data curation (equal), Methodology (equal), Resources (equal) |
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| Abstract: | Until now, although there are many examples of studying the magnetic properties of Schiff base binuclear lanthanide complexes, the relationship between the structure and magnetic properties of the complexes still is worth further investigation in order to improve the magnetic properties of Schiff base lanthanide complexes. In this work, we successfully obtained two series of binuclear Ln complexes by in situ reaction of 4-diethylaminosalicylaldehyde, benzoic hydrazide and different lanthanide salts at 80°C under solvothermal conditions, namely, Ln2(L)3(NO3)3]·CH3CN·CH3OH·H2O Ln = Dy ( 1 ), Ho ( 2 ), Gd ( 3 ) L = deprotonated 4-diethylamino salicylaldehyde benzoylhydrazine], Ln2(L)4(CH3COO)]CH3COO·CH3CN Ln = Dy ( 4 ), Ho ( 5 ), Gd ( 6 )]. The complex 1 contains three Schiff base ligands L, two Dy (III) ions, and three NO3?. The ligand H1L is formed by in situ Schiff base reaction with 4-diethylaminosalicylaldehyde and benzoic hydrazide with the participation of Ln (NO3)3. When replacing Ln (NO3)3 with Ln (OAc)3, obtained three μ2-OAc bridged binuclear Ln (III) complexes. The magnetic study showed that complex 4 exhibits field-induced single-molecule magnet (SMM) behavior while complex 1 does not show any SMMs behavior. In addition, we have studied the magnetocaloric effect of complexes 3 and 6 , their maximum ?ΔSm values are 21.37 J kg?1 K?1 and 15.32 J kg?1 K?1, respectively, under ΔH = 7 T and T = 2 K. |
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| Keywords: | binuclear lanthanide complexes coordinated anions field-induced SMMs behavior magnetocaloric effect solvothermal synthesis |
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