4.5 Article

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

期刊

POLYHEDRON
卷 202, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2021.115173

关键词

Manganese; Coordination polymer; Crystal structure; Magnetism; Magnetocaloric effect

资金

  1. National Natural Science Foundation of China [21601058, 21771112]
  2. 111 project [B12015]
  3. Hunan Provincial Natural Science Foundation of China [2018JJ3146]

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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.
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.

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