ic0c00281_si_001.pdf (977.75 kB)

A Series Three-Dimensional Ln4Cr4 (Ln = Gd, Tb, Er) Heterometallic Cluster-Based Coordination Polymers Containing Interesting Nanotubes Exhibiting High Magnetic Entropy

Download (977.75 kB)
journal contribution
posted on 31.03.2020 by Yanzhao Yu, Xingxiang Pan, Chenhui Cui, Ximing Luo, Ningfang Li, Hua Mei, Yan Xu
A series of novel 3D 3d-4f heterometallic cluster-based coordination polymers, [Ln4Cr43-O)44-O)4(NA)8(H2O)12xH2O (Ln = 1-Gd, 2-Tb, 3-Er; HNA = nicotinic acid; x = 13 (1-Gd), 11.33 (2-Tb), 15 (3-Er)), have been successfully synthesized by hydrothermal method using nicotinic acid as bridging ligand. The single-crystal X-ray diffraction (SCXRD) analysis indicated that the basic unit of Ln4Cr4 shows a butterfly-shaped structure. Furthermore, each Ln4Cr4 cluster connects with other four Ln4Cr4 clusters by bridging NA ligands to form a 3D structure containing interesting 1D honeycomb-shaped coordination nanotubes. The variable temperature magnetic susceptibility measurements of compound 1 revealed that the existence of antiferromagnetic (AF) coupling between the metal ions in the Gd4Cr4 clusters. Field-dependent isothermal magnetization studies displayed that the magnetic entropy change (−ΔSm) value of 1-Gd reached 22.05 J K–1 kg–1.

History

Exports