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. 2024 May 7;16(10):1311.
doi: 10.3390/polym16101311.

Pressing of Functionalized Polymer Composite Materials to Improve Mössbauer Measurement Signals

Justus Pawlak  1   2   3 , Jules Brehme  1   2   4 , Maximilian Seydi Kilic  1 , Kevin Tran  1   2 , Justin Koch  1 , Mohammad Beyki  2   3 , Ralf Sindelar  2   4 , Robert Patzke  2   3 , Franz Renz  1   2
Affiliations

Pressing of Functionalized Polymer Composite Materials to Improve Mössbauer Measurement Signals

Justus Pawlak et al. Polymers (Basel). .

Abstract

Coordination compounds, like iron(II) triazole complexes, exhibit spin crossover (SCO) behavior at around room temperature. Therefore, they are interesting for a variety of possible applications, and it is convenient to integrate them into polymers. Due to a reduction of the iron content and thus also 57Fe content in the sample through integration in polymers, Mössbauer measurements are only possible with greater difficulty or very long measurement times without expensive enrichment of the samples with 57Fe. So, other ways of improving the Mössbauer signal for these composite materials are necessary. Therefore, we pressed these composite materials to improve the Mössbauer spectra. In this study, we synthesized an iron(II) triazole spin crossover complex and an electrospun polymer complex composite nanofiber material including the same complex. For both products, Mössbauer measurements were performed at room temperature before and after using a press to show that the complex composite is not harmed through pressing. We investigate the influence of the pressing impact on the Mössbauer measurements in the context of measurement statistics and the measured signals. We show that pressing is not connected to any changes in the sample regarding the spin and oxidation state. We present that pressing improves the statistics of the Mössbauer measurements significantly. Furthermore, we use SEM measurements and PXRD to investigate whether or not the obtained fiber mats are destroyed in the pressing process.

Keywords: Mössbauer; composites; coordination chemistry; electrospinning; molecular switch; nanofiber; pellet; spin crossover; triazole complexes.

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Conflict of interest statement

The authors declare that there are no conflicts of interest.

Figures

Figure 1
Figure 1
Schematic of the electrospinning process of the composite.
Figure 2
Figure 2
IR spectra of the ligand and the synthesized complex.
Figure 3
Figure 3
Mössbauer spectra of the pure unpressed (left) and pressed (right) complex.
Figure 4
Figure 4
Mössbauer spectra of the unpressed (left) and pressed (right) composites.
Figure 5
Figure 5
SEM Imaging of the [Fe(Atrz)3](2ns)2 powder and [Fe(Atrz)3](2ns)2 pressed pellet at 15 kV acceleration voltage.
Figure 6
Figure 6
SEM images of spun PAN [Fe(Atrz)3](2ns)2 nanofibers and pressed nanofiber surface at 15 kV acceleration voltage.
Figure 7
Figure 7
PXRD pattern of pristine and unpressed complex (left) and the pattern of pristine and pressed composite and pristine PAN for comparison (right).
See this image and copyright information in PMC

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