title: 3D oxalato-bridged lanthanide(iii) MOFs with magnetocaloric, magnetic and photoluminescence properties.
abstract: Four isostructural 3D lanthanide(iii) metal-organic frameworks with the general formula (H6edte)0.5[LnIII(ox)2(H2O)] (Ln = Gd (1), Tb (2), Dy (3) and Ho (4); H4edte = N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine) and ox = oxalate have been synthesized from oxalate. These compounds were characterized using single-crystal X-ray diffraction, FTIR and TGA/DTG. The magnetic investigation has been performed for 1-4 and the results reveal that a Gd(iii) containing MOF has the highest magnetic density and exhibits a larger cryogenic magnetocaloric effect (ΔSm= 35.9 J kg-1K-1for ΔH = 9 T at 2.0 K) with a high Debye temperature (θD= 342(3) and rD= 35). For the Dy derivative, an ac-out-of-phase signal was found, and further measurements under an applied field of 1000 Oe showed frequency-dependent out-of-phase magnetic susceptibility. Solid-state luminescence indicates that Tb and Dy-containing complexes are photoluminescent materials.
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. nadeemchem@yahoo.com tongml@mail.sysu.edu.cn.
authors.forename: Muhammad Nadeem
authors.initials: MN
authors.lastname: Akhtar
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. nadeemchem@yahoo.com tongml@mail.sysu.edu.cn.
authors.forename: Yan-Cong
authors.initials: YC
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Faculty of Science, the University of Jordan, Amman 11942, Jordan.
authors.forename: Murad A
authors.initials: MA
authors.lastname: AlDamen
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. nadeemchem@yahoo.com tongml@mail.sysu.edu.cn and State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.
authors.forename: Ming-Liang
authors.identifier: http://orcid.org/0000-0003-4725-0798
authors.initials: ML
authors.lastname: Tong