A Mn(II) Coordination Polymer with Sulfate and trans-1,2-Bis(4- pyridyl)ethylene Bridges: Synthesis, Structure, Magnetic and Ferroelectric Properties

The complexes [MCl2 (TzH)4] (M=Mn (1), Fe (2); TzH=1,2,4-1H-triazole) and [ZnCl2 (TzH)2] (3) have been obtained by mechanochemical reactions of the corresponding divalent metal chloride and 1,2,4-1H-triazole. They were successfully used as precursors for the formation of coordination polymers either by a microwave-assisted reaction or by thermal conversion. For manganese, the conversion directly yielded 1∞ [MnCl2 TzH] (4), whereas for the iron-containing precursor, 1∞ [FeCl2 TzH] (6), was formed via the intermediate coordination polymer 1∞ [FeCl(TzH)2]Cl (5). For cobalt, the isotypic polymer 1∞ [CoCl(TzH)2]Cl (7) was obtained, but exclusively by a microwave-induced reaction directly from CoCl2 . The crystal structures were resolved from single crystals and powders. The dielectric properties were determined and revealed large differences in permittivity between the precursor complexes and the rigid chain-like coordination polymers. Whereas the monomeric complexes exhibit very different dielectric behaviour, depending on the transition metal, from "low-k" to "high-k" with the permittivity ranging from 4.3 to >100 for frequencies of up to 1000 Hz, the coordination polymers and complexes with strong intermolecular interactions are all close to "low-k" materials with very low dielectric constants up to 50 °C. Therefore, the conversion procedures can be used to deliberately influence the dielectric properties from complex to polymer and for different 3d transition-metal ions.

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Ferroelectricity in Metal–Organic Frameworks: Characterization and Mechanisms

Asadi

Veen

2016

Eur J Inorg Chem

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Ferroelectric metal-organic frameworks are emerging as an exciting field of research and have witnessed great progress in the last decade. In this contribution, we briefly discuss ferroelectricity and its means of demonstration. Three [a] in 2009. His PhD research work and patents contributed to the demonstration of the first organic ferroelectric memory array and its logic table. Following a Post-Doc period, he joined Royal Philips Electronics N. V. as a research scientist. His work at Philips was focused on the investigation of metal oxides, ferroelectrics and graphene for optoelectronic applications. In 2013, he moved to the Max-Planck Institute for Polymer Research as a senior scientist. In 2014, he was awarded the Sofja Kovalevskaja Award of the Alexander von Humboldt Foundation for his project on organic multiferroics. His current research is focused on electronic devices based on organic/inorganic hybrids. He is the coauthor of numerous papers and the holder of eight patents. Monique A. van der

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A Mn(II) Coordination Polymer with Sulfate and trans-1,2-Bis(4- pyridyl)ethylene Bridges: Synthesis, Structure, Magnetic and Ferroelectric Properties

Cited by 4 publications

References 6 publications

Applications of Metal–Organic Frameworks (MOFs) and Their Derivatives in Piezo/Ferroelectrics

Applications of Metal–Organic Frameworks (MOFs) and Their Derivatives in Piezo/Ferroelectrics

Mechanochemical Synthesis of 3d Transition‐Metal–1,2,4‐Triazole Complexes as Precursors for Microwave‐Assisted and Thermal Conversion to Coordination Polymers with a High Influence on the Dielectric Properties

Ferroelectricity in Metal–Organic Frameworks: Characterization and Mechanisms

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