A 1D Mn-based coordination polymer with significant magnetocaloric effect

A 1D Mn-containing coordination polymer (CP) has been prepared by the hydrothermal assembly of MnCl2.(H2O)-H-4 with Hcptpy and H(2)bdc (Hcptpy = 4-(4-carboxyphenyl)-2,2'4',4''-terpyridine, H(2)bdc = 1,4benzenedicarboxylic acid), [Mn(cptpy)Cl(H2O)(DMF)](n) (1), which is further structurally characterized by different methods including X-ray single-crystal diffraction, elemental analysis, infrared (IR) spectrum, thermogravimetric (TG) analysis, and powder X-ray diffraction (PXRD). Structural analysis indicates that the asymmetric skeleton of 1 consists of one Mn2+ ion, one cptpy- ligand, one Cl- anion, one coordinated H2O and one DMF. Each six-coordinated Mn2+ ion in 1 is alternately connected by carboxyl O atoms and pyridine N atoms of cptpy- ligands to present a 1D chain, which could be further stacked to produce a 3D supramolecular structure through hydrogen bonds and pi...pi stacking interactions. Magnetic results suggest that the presence of antiferromagnetic coupling interactions among Mn2+ ions in 1. Furthermore, 1 exhibits significant magnetocaloric effect (MCE) with the maximum -Delta S-m value of 26.3 J.kg(-1.)K(-1) at 2.0 K for an applied field of 70 kOe. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A 1D Mn-containing coordination polymer was prepared by hydrothermal assembly and characterized structurally. It exhibited antiferromagnetic coupling interactions among Mn ions and significant magnetocaloric effect. The compound has a unique chain structure and can further stack to produce a 3D supramolecular structure.