Citation: LIU Sui-Jun, CUI Yu, SONG Wei-Chao, WANG Qing-Lun, BU Xian-He. Carboxylate-Bridged Tetranuclear Lanthanide Clusters: Magnetocaloric Effect and Slow Magnetic Relaxation[J]. Chinese Journal of Inorganic Chemistry, ;2015, 31(9): 1894-1902. doi: 10.11862/CJIC.2015.240 shu

Carboxylate-Bridged Tetranuclear Lanthanide Clusters: Magnetocaloric Effect and Slow Magnetic Relaxation

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1. Department of Chemistry, TKL of Metal- and Molecule-Based Material Chemistry and Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Nankai University, Tianjin 300071, China;
2.
2. School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China

Corresponding author: BU Xian-He,
Received Date: 8 June 2015
Available Online: 22 July 2015
Fund Project: 国家自然科学基金(No.21290171) (No.21290171)江西省科技厅青年自然科学基金(No.20151BAB213003)资助项目。 (No.20151BAB213003)

By using carboxylate and chelating ligands, a family of tetranuclear lanthanide clusters, namely [Ln₄(mnba)₁₂(tzp)₂(H₂O)₂] (Ln=Gd (1), Tb (2) and Er (3), Hmnba=m-nitrobenzoic acid, tzp=2-(1H-1, 2, 4-triazol-3-yl)pyridine), has been obtained under hydrothermal conditions. The three complexes exhibit linear tetranuclear clusters bridged by carboxylates with syn, syn-μ₂-η¹:η¹ mode. Magnetic investigation indicates weak ferromagnetic interaction between adjacent Gd^Ⅲ or Er^Ⅲ ions of the Ln₄ cluster in 1 and 3, while weak intra-molecular antiferromagnetic interaction between Tb^Ⅲ ions and/or depopulation of the Tb^Ⅲ excited Stark sub-levels in 2. Complex 1 exhibits a significant magnetocaloric effect with -ΔS_m^max=20.6 J·kg^-1·k^-1 and ac susceptibility measurements reveal frequency- and temperature-dependent out-of-phase signal under 5 kOe dc field in 3, being typical slow magnetic relaxation behavior due to strong anisotropy of Er^Ⅲ and ferromagnetic coupling.
- carboxylate;lanthanide clusters;magnetocaloric effect;slow magnetic relaxation
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