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Title

Crystal structure, phase transitions, dielectric and vibrational studies and photoluminescence properties of a new iron fluoride based on bipyridine

AuthorsBouketaya, Sabrine; Elferjani, Atef; Abdelbaky, Mohammed S. M.; Dammak, Mohamed; García-Granda, Santiago
KeywordsHybrid fluoride
Iron
2,2′-bipyridine
DSC
Impedance spectroscopy
Photoluminescence properties
Issue Date2019
PublisherElsevier
CitationJournal of Solid State Chemistry 277: 395-405 (2019)
AbstractThe new iron-fluoride, based on bipyridine formulated as FeF3(2,2′-bpy) (2,2′-bpy = 2,2′-bipyridine), was obtained by hydrothermal synthesis. The crystalline structure was characterized by single crystal X-Ray diffraction data analysis. It crystallizes in monoclinic space group Cc, with a = 14.030(4) Å, b = 9.487(3) Å, c = 7.650(2) Å and β = 103.287(3)º. Moreover, it exhibits three-dimensional organic-inorganic network, resulting from the association of [FeF4N2]∞ chains pertaining to corner sharing FeF4N2 octahedra extending along with the c-axis linked through weak C–H...F hydrogen bonds. The thermal analysis (TG, SDTA and DSC) of the title compound reveals the presence of the phase transitions at high temperature. In order to shed light on the electrical conductivity and dielectric properties of the title compound, we carried out, in the frequency range 200 to 2E5 Hz, impedance spectroscopy technique, in the temperature range 310–380K. The conductivity relaxation parameters of some H+ conducting in the FeF3(2,2′-bpy) material were determined from an analysis pertaining to electric conductivity data. Transport properties in this material appear due to proton hopping mechanism. Finally, the optical properties were evaluated by photoluminescence spectroscopy.
Publisher version (URL)https://doi.org/10.1016/j.jssc.2019.06.036
URIhttp://hdl.handle.net/10261/210813
Identifiersdoi: 10.1016/j.jssc.2019.06.036
issn: 0022-4596
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