title: Temperature- and vapor-induced reversible single-crystal-to-single-crystal transformations of three 2D/3D GdIII-organic frameworks exhibiting significant magnetocaloric effects.
abstract: By using Gd2O3, propanedioic acid (H2pda) and oxalic acid (H2ox), a new Gd-based metal-organic framework (MOF) [Gd(pda)(ox)0.5(H2O)2]n(1) has been successfully constructed and structurally characterized. Interestingly, temperature- and vapor-induced reversible single-crystal-to-single-crystal transformations occurred and two new MOFs, namely [Gd(pda)(ox)0.5(H2O)]n(1a) and [Gd(pda)(ox)0.5]n(1b), have been obtained. Complex 1 displays a two-dimensional (2D) layer structure composed of zigzag [Gd(pda)]nchains and it could also be made up of numerous Gd6macrocycles. Thermal dehydration leads to more complicated three-dimensional (3D) 'pillar-layer' structures (1a and 1b) with the same coordination mode of pda2-anions. Magnetic studies suggest the presence of ferromagnetic couplings between the intrachain or intralayer GdIIIions and large magnetocaloric effects (MCEs) with -ΔS = 45.0 J kg-1K-1(1), 46.1 J kg-1K-1(1a) and 46.8 J kg-1K-1(1b) under a 7 T applied field. Therefore, the interest of 'robust magnetocaloric MOFs' is now extended to compounds showing weak ferromagnetic couplings and hence having better magnetocaloric performances for small field changes.
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: Sui-Jun
authors.identifier: http://orcid.org/0000-0002-7705-0634
authors.initials: SJ
authors.lastname: Liu
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: Chen
authors.initials: C
authors.lastname: Cao
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: Shu-Li
authors.initials: SL
authors.lastname: Yao
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: Teng-Fei
authors.initials: TF
authors.lastname: Zheng
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: Zheng-Xiang
authors.initials: ZX
authors.lastname: Wang
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: Chao
authors.initials: C
authors.lastname: Liu
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: Jin-Sheng
authors.initials: JS
authors.lastname: Liao
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: Jing-Lin
authors.initials: JL
authors.lastname: Chen
authors.affiliation: School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, Liaocheng University, Liaocheng 252000, P.R. China. lyw5251851@163.com.
authors.forename: Yun-Wu
authors.identifier: http://orcid.org/0000-0001-7673-7787
authors.initials: YW
authors.lastname: Li
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P.R. China. liusuijun147@163.com wenherui63@163.com.
authors.forename: He-Rui
authors.identifier: http://orcid.org/0000-0002-6497-2955
authors.initials: HR
authors.lastname: Wen