A Series Three-Dimensional Ln 4 Cr 4 (Ln = Gd, Tb, Er) Heterometallic Cluster-Based Coordination Polymers Containing Interesting Nanotubes Exhibiting High Magnetic Entropy

• Published in: Inorganic chemistry Vol. 59; no. 8; pp. 5593 - 5599
• Main Authors: Yu, Yanzhao, Pan, Xingxiang, Cui, Chenhui, Luo, Ximing, Li, Ningfang, Mei, Hua, Xu, Yan
• Format: Journal Article
• Language: English
• Published: United States 20.04.2020
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.0c00281

A series of novel 3D 3d-4f heterometallic cluster-based coordination polymers, [Ln Cr (μ -O) (μ -O) (NA) (H O) ]· H O (Ln = , , ; HNA nicotinic acid; = 13 ( ), 11.33 ( ), 15 ( )), 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 Ln Cr shows a butterfly-shaped structure. Furthermore, each Ln Cr cluster connects with other four Ln Cr 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 revealed that the existence of antiferromagnetic (AF) coupling between the metal ions in the Gd Cr clusters. Field-dependent isothermal magnetization studies displayed that the magnetic entropy change (-Δ ) value of reached 22.05 J K kg .