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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Brede FA, Heine J, Sextl G, et al. 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. Chemistry. 2016;22(8):2708-18doi: 10.1002/chem.201503725.
Brede, F. A., Heine, J., Sextl, G., & Müller-Buschbaum, K. (2016). 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. Chemistry (Weinheim an der Bergstrasse, Germany), 22(8), 2708-18. https://doi.org/10.1002/chem.201503725
Brede, Franziska A, et al. "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." Chemistry (Weinheim an der Bergstrasse, Germany) vol. 22,8 (2016): 2708-18. doi: https://doi.org/10.1002/chem.201503725
Brede FA, Heine J, Sextl G, Müller-Buschbaum K. 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. Chemistry. 2016 Feb 18;22(8):2708-18. doi: 10.1002/chem.201503725. Epub 2016 Jan 21. PMID: 26797710.
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Chemistry. 2016 Feb 18;22(8):2708-18. doi: 10.1002/chem.201503725. Epub 2016 Jan 21.

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.

Chemistry (Weinheim an der Bergstrasse, Germany)

Franziska A Brede, Johanna Heine, Gerhard Sextl, Klaus Müller-Buschbaum

Affiliations

  1. Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany), Fax: (+49)?931-31-88724.
  2. Fachbereich Chemie, Universität Marburg, Hans-Meerwein-Straße, 35043, Marburg, Germany.
  3. Institut für Chemische Technologie der Materialsynthese, Universität Würzburg, Röntgenring 11, 97070, Würzburg, Germany.
  4. Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany), Fax: (+49)?931-31-88724. [email protected].

PMID: 26797710 DOI: 10.1002/chem.201503725

Abstract

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.

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: coordination polymers; mechanochemistry; microwave chemistry; permittivity; transition metals

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