Honeycomb-like layered cobalt(II) phosphonate with [O2CCH(OH)PO3]3− as ligand: Hydrothermal synthesis, crystal structure, and magnetic properties

Zhang, Yangyang; Zeng, Ming‐Hua; Qi, Yue; Sang, Shiyun; Liu, Zhongmin

doi:10.1016/j.inoche.2006.08.016

Cited by 20 publications

(2 citation statements)

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“…Furthermore, metal phosphonate compounds frequently form dense layered structures, rendering the formation of porous frameworks challenging . Nevertheless, several open frameworks featuring bisphosphonato and carboxyphosphonato linkers have been shown to display long-range magnetic order at low temperatures (see Tables and ). − Specifically, 2D and 3D Ni II frameworks based on methylenediphosphonate (mdp 4– ) order as ferromagnets with T C = 3.1(1)–3.8(2) K . In addition, 3D Cu II frameworks with longer bisphosphonato linkers display long-range antiferromagnetic order with T N = 4(1) K, and a similar ordering temperature was observed for a compound featuring a hydroxo-substituted bisphosphonato ligand and a pyrazine coligand .…”

Section: Mof Magnets With Diamagnetic Bridging Ligandsmentioning

confidence: 99%

“…Substituting bisphosphonato ligands for carboxyphosphonates has afforded compounds with similar low magnetic ordering temperatures. This class of compounds includes the Co II frameworks (H 2 en) 0.5 [Co II (cmp)(H 2 O)]·H 2 O (en = ethylenediamine; cmp 3– = carboxymethylphosphonate) and Co II (Hpmab) {Hpmab 2– = 4-[(phosphonatomethylammonio)methyl]benzoate}, which order as canted antiferromagnets with T N = 4.3 and 2.0 K, respectively. , However, using carboxylate-functionalized phosphonato ligands along with hydroxo coligands has been shown to provide dramatic improvements in magnetic properties. , In particular, the compound Co II 2 (OH)(2-pmb) [2-pmb 3– = 2-(phosphonatomethyl)benzoate] displays long-range canted antiferromagnetic order with T c = 31.0 K, which is an order of magnitude higher than the ordering temperatures for most phosphonate-containing magnets. This framework features a unique 2D layered structure made up of double chains of Co II 2 (μ 4 -OH)O 3 units connected by (CPO 3 ) 2– phosphonate groups.…”

Section: Mof Magnets With Diamagnetic Bridging Ligandsmentioning

confidence: 99%

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Metal–Organic Framework Magnets

2020

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Metal–organic frameworks represent the ultimate chemical platform on which to develop a new generation of designer magnets. In contrast to the inorganic solids that have dominated permanent magnet technology for decades, metal–organic frameworks offer numerous advantages, most notably the nearly infinite chemical space through which to synthesize predesigned and tunable structures with controllable properties. Moreover, the presence of a rigid, crystalline structure based on organic linkers enables the potential for permanent porosity and postsynthetic chemical modification of the inorganic and organic components. Despite these attributes, the realization of metal–organic magnets with high ordering temperatures represents a formidable challenge, owing largely to the typically weak magnetic exchange coupling mediated through organic linkers. Nevertheless, recent years have seen a number of exciting advances involving frameworks based on a wide range of metal ions and organic linkers. This review provides a survey of structurally characterized metal–organic frameworks that have been shown to exhibit magnetic order. Section 1 outlines the need for new magnets and the potential role of metal–organic frameworks toward that end, and it briefly introduces the classes of magnets and the experimental methods used to characterize them. Section 2 describes early milestones and key advances in metal–organic magnet research that laid the foundation for structurally characterized metal–organic framework magnets. Sections 3 and 4 then outline the literature of metal–organic framework magnets based on diamagnetic and radical organic linkers, respectively. Finally, Section 5 concludes with some potential strategies for increasing the ordering temperatures of metal–organic framework magnets while maintaining structural integrity and additional function.

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