Two Gd2 cluster complexes with monocarboxylate ligands displaying significant magnetic entropy changes

Two Gd2 cluster complexes with the formulas of [Gd2(dnba)6(phen)2] (1) and [Gd2(Hnsa)2(nsa)2(phen)2(H2O)2] (2) (Hdnba = 3,5-dinitrobenzoic acid, H2nsa = 5-nitrosalicylic acid and phen = 1,10-phenanthroline) respectively have been successfully synthesized under hydrothermal conditions. The GdIII ions...

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Veröffentlicht in:Journal of molecular structure 2020-01, Vol.1200, p.127094, Article 127094
Hauptverfasser: Zheng, Teng-Fei, Tian, Xue-Mei, Ji, Jie, Luo, Hai, Yao, Shu-Li, Liu, Sui-Jun, Tang, Bing-E, Zhao, Ya-Juan, Mao, Jiangang, Zhao, Qiang, He, Kun-Huan, Wen, He-Rui
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Sprache:eng
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Zusammenfassung:Two Gd2 cluster complexes with the formulas of [Gd2(dnba)6(phen)2] (1) and [Gd2(Hnsa)2(nsa)2(phen)2(H2O)2] (2) (Hdnba = 3,5-dinitrobenzoic acid, H2nsa = 5-nitrosalicylic acid and phen = 1,10-phenanthroline) respectively have been successfully synthesized under hydrothermal conditions. The GdIII ions of 1 are bridged by four carboxylates with syn-syn-μ2-η1:η1 and syn-syn-μ2-η1:η2 modes, while the GdIII ions of 2 are linked by two carboxylate ligands with only syn-syn-μ2-η1:η2 mode. Magnetic studies indicate that weak antiferromagnetic and ferromagnetic interactions exist between the adjacent GdIII ions within Gd2 clusters, respectively. Complexes 1 and 2 display distinct magnetocaloric effects induced by different magnetic interactions and magnetic densities. Notably, the maximum magnetic entropy changes (−ΔSmmax) of 1 and 2 reach 16.8 J kg−1 K−1 and 22.2 J kg−1 K−1 with ΔH = 7 T at 2 K and 3.5 K, respectively. Two new Gd2 clusters connected by aromatic monocarboxylates with different bridging modes have been hydrothermally synthesized and complexes 1 and 2 exhibit antiferromagnetic and ferromagnetic behaviors, respectively, with significant magnetic entropy changes. [Display omitted] •Two carboxylate-bridged GdIII clusters have been synthesized and structurally characterized.•The reaction methods and structures were fully analyzed.•The different magnetism including magnetocaloric properties were detail studied.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2019.127094