Issue 22, 2016

Tricarboxylate-based GdIII coordination polymers exhibiting large magnetocaloric effects

Abstract

Two GdIII coordination polymers with the formula [Gd(cit)(H2O)] (1) and [Gd(nta)(H2O)2] (2) (H4cit = citric acid, H3nta = nitrilotriacetic acid) have been successfully prepared under hydrothermal conditions. Complex 1 exhibits a three-dimensional (3D) structure based on carboxylate-bridged layers, while complex 2 is a double-layer structure containing eight-coordinated GdIII. Magnetic investigations reveal that weak antiferromagnetic couplings between adjacent GdIII ions in both 1 and 2 with different Weiss values result in large cryogenic magnetocaloric effects. It is notable that the maximum entropy changes (−ΔSmaxm) of 1 and 2 reach 31.3 J kg−1 K−1 and 32.2 J kg−1 K−1 at 2 K for a moderate field change (ΔH = 3 T), and a remarkable −ΔSmaxm (41.5 J kg−1 K−1 for 1 and 42.0 J kg−1 K−1 for 2) could be obtained for ΔH = 7 T.

Graphical abstract: Tricarboxylate-based GdIII coordination polymers exhibiting large magnetocaloric effects

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2016
Accepted
27 Apr 2016
First published
28 Apr 2016

Dalton Trans., 2016,45, 9209-9215

Tricarboxylate-based GdIII coordination polymers exhibiting large magnetocaloric effects

S. Liu, C. Cao, C. Xie, T. Zheng, X. Tong, J. Liao, J. Chen, H. Wen, Z. Chang and X. Bu, Dalton Trans., 2016, 45, 9209 DOI: 10.1039/C6DT01349J

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