A New Mn(II) Coordination Polymer Based on Tetranuclear Clusters: Synthesis, Structure and Magnetic Property

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ORIGINAL PAPER

A New Mn(II) Coordination Polymer Based on Tetranuclear Clusters: Synthesis, Structure and Magnetic Property Feng-Yang Ju1 • Wen-Bo Guo1 • Xiao-Xiao Wang1 • Guang-Zhen Liu2 Received: 14 October 2020 / Accepted: 7 November 2020 Springer Science+Business Media, LLC, part of Springer Nature 2020

Abstract A new Mn(II) coordination polymer with the formula {[Mn2(bma)2(2,20 -bpy)(H2O)]}n (1) (H2bma = 2-benzylmalonicacid, 2,20 -bpy = 2,20 -bispyridine), was hydrothermally synthesized and then characterized by single-crystal X-ray diffraction. Complex 1 possesses infinite one dimensional ladder structure based on linear tetranuclear Mn(II) clusters. TGA experiment shows that complex 1 can maintain its framework integrity before 225 C. In addition, the magnetic data indicate the existence of dominant antiferromagnetic behavior within the tetranuclear cluster. Keywords 2-Benzylmalonicacid Tetranuclear clusters Manganese (II) Magnetic property

Introduction Metal-cluster based coordination polymers (MCCPs) have attracted substantial interest in recent years [1–5]. And enormous research on MCCPs of manganese have been witnessed, benefiting from their potential applications in two main fields. On the one hand, polynuclear manganese species are essential constituents of many living systems, identified widely in enzymes and proteins [6]. MCCPs of manganese can serve as model compounds to imitate the active sites of metalloenzymes in the bioinorganic chemistry, such as catalases and the water-oxidizing center of photosystem II [7–9]. On the other hand, there are ferromagnetic or antiferromagnetic magnetic exchange interactions between neighbor manganese ions in polynuclear units [10, 11]. Some of these species may behave as single molecule magnets in material science, deriving from the

Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10876-020-01942-0) contains supplementary material, which is available to authorized users. & Guang-Zhen Liu [email protected] 1

College of Food and Drug, Luoyang Normal University, Luoyang 471934, Henan, China

2

College of Chemistry and Chemical Engineering, and Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang Normal University, Luoyang 471934, Henan, China

high spin values in the ground state and a large anisotropy [12]. Especially, numerous MCCPs based on tetranuclear manganese subunits have been prepared by using hydroxo group, azide group, schiff base, hydrazone, b-diketone, halogen, carboxylate as organic ligands [13–22]. And the manganese ions are inherent to exhibit different oxidation states (MnII2MnIII2, MnII3MnIII, MnII2MnIV2, MnII4, MnIII4, MnIV4, and so on). Moreover, their four manganese ions have exhibited varied arrangements, including butterfly, square, damantane, cubane, basket and linear. Among these six typologies, the butterfly cores are the most common topology, while the linear cores taking cis- or trans-conformation are relatively rare. Ben

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