Magnetic, Structural and Spectroscopic Properties of Iron(II)-Octacyanoniobate(IV) Crystalline Film Obtained by Ion-Exchange Synthesis

Over recent years, investigations of coordination polymer thin films have been initiated due to their unique properties, which are expected to be strongly enhanced in the thin film form. In this work, a crystalline [FeII(H2O)2]2[NbIV(CN)8]∙4H2O (1) film on a transparent Nafion membrane was obtained,...

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Published inMaterials Vol. 13; no. 13; p. 3029
Main Authors Sas, Wojciech, Pinkowicz, Dawid, Perzanowski, Marcin, Fitta, Magdalena
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 07.07.2020
MDPI
Subjects
Aqueous solutions
Chemical synthesis
Coercivity
Coordination polymers
Critical temperature
Crystal structure
Crystallinity
Energy consumption
Ferromagnetism
Fourier transforms
Ion exchange
Magnetic measurement
Magnetic properties
molecular magnets
Morphology
octacyanometallates
Oxidation
Phase transitions
Polymer films
Size effects
Spectrum analysis
Thin films
X-ray spectroscopy
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Summary:Over recent years, investigations of coordination polymer thin films have been initiated due to their unique properties, which are expected to be strongly enhanced in the thin film form. In this work, a crystalline [FeII(H2O)2]2[NbIV(CN)8]∙4H2O (1) film on a transparent Nafion membrane was obtained, for the first time, via ion-exchange synthesis. The proper film formation and its composition was confirmed with the use of energy dispersive X-ray spectroscopy and infrared spectroscopy, as well as in situ Ultraviolet-Visible (UV-Vis) spectroscopy. The obtained film were also characterized by scanning electron microscopy, X-ray diffraction, and magnetic measurements. The [FeII(H2O)2]2[NbIV(CN)8]∙4H2O film shows a sharp phase transition to a long-range magnetically ordered state at Tc = 40 K. The 1 film is a soft ferromagnet with the coercive field Hc = 1.2 kOe. Compared to the bulk counterpart, a decrease in critical temperature and a significant increase in the coercive field were observed in the films indicating a distinct size effect. The decrease in Tc could also have been related to the possible partial oxidation of FeII ions to FeIII, which could be efficient, due to the large surface of the thin film sample.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma13133029