Synthesis, structure and magnetic behavior of new 1D metal–organic coordination polymer with Fe3O core

Yutkin, Maxim; Zavakhina, M. S.; Вировец, А. В.; Dybtsev, Danil N.; Fedin, Vladimir P.; Kusamoto, Tetsuro; Nishihara, Hiroshi

doi:10.1016/j.ica.2010.10.015

Cited by 10 publications

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References 21 publications

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“…The reddish-brown platelike crystals of 1 were easily synthesized by a solvothermal reaction between metal salts and organic amines (SI). At 250 K (in LTP), 1 crystallizes in orthorhombic space group Pca 2 1 , belonging to the polar point group mm2 , with cell parameters of a LTP = 21.8233(5) Å, b LTP = 9.0775(2) Å, c LTP = 13.0494(3) Å, and V LTP = 2585.10(10) Å 3 (Table S1), which are similar to the reported complex [HN(CH 3 ) 3 ][Fe 3 (μ 3 -O)(μ-O 2 CH) 8 ]·DMF ( 2 ) crystallized in the same point group . In the structure of 1 , the oxo-centered trinuclear iron formate clusters [Fe 3 III (μ 3 -O)(μ-O 2 CH) 6 ] were bridged by anti–anti formate in forming the 1D chain, in which the unsaturated coordination site of the cluster was occupied by monodentate formate (Figure S1a).…”

Section: Resultsmentioning

confidence: 99%

A High Working Temperature Multiferroic Induced by Inverse Temperature Symmetry Breaking

Zhan,

Zhou,

et al. 2024

J. Am. Chem. Soc.

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Molecular-based multiferroic materials that possess ferroelectric and ferroelastic orders simultaneously have attracted tremendous attention for their potential applications in multiplestate memory devices, molecular switches, and information storage systems. However, it is still a great challenge to effectively construct novel molecular-based multiferroic materials with multifunctionalities. Generally, the structure of these materials possess high symmetry at high temperatures, while processing an obvious order−disorder or displacement-type ferroelastic or ferroelectric phase transition triggered by symmetry breaking during the cooling processes. Therefore, these materials can only function below the Curie temperature (T c ), the low of which is a severe impediment to their practical application. Despite great efforts to elevate T c , designing single-phase crystalline materials that exhibit multiferroic orders above room temperature remains a challenge. Here, an inverse temperature symmetry-breaking phenomenon was achieved in [FPM][Fe 3 (μ 3 -O)(μ-O 2 CH) 8 ] (FPM stands for 3-(3formylamino-propyl)-3,4,5,6-tetrahydropyrimidin-1-ium, which acts as the counterions and the rotor component in the network), enabling a ferroelastoelectric phase at a temperature higher than T c (365 K). Upon heating from room temperature, two-step distinct symmetry breaking with the mm2Fm species leads to the coexistence of ferroelasticity and ferroelectricity in the temperature interval of 365−426 K. In the first step, the FPM cations undergo a conformational flip-induced inverse temperature symmetry breaking; in the second step, a typical ordered−disordered motion-induced symmetry breaking phase transition can be observed, and the abnormal inverse temperature symmetry breaking is unprecedented. Except for the multistep ferroelectric and ferroelastic switching, this complex also exhibits fascinating nonlinear optical switching properties. These discoveries not only signify an important step in designing novel molecular-based multiferroic materials with high working temperatures, but also inspire their multifunctional applications such as multistep switches.

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Section: Resultsmentioning

confidence: 99%