TY - JOUR

T1 - Incorporation and Deposition of Spin Crossover Materials into and onto Electrospun Nanofibers

AU - Kilic, Maximilian Seydi

AU - Brehme, Jules

AU - Pawlak, Justus

AU - Tran, Kevin

AU - Bauer, Friedrich Wilhelm

AU - Shiga, Takuya

AU - Suzuki, Taisei

AU - Nihei, Masayuki

AU - Sindelar, Ralf Franz

AU - Renz, Franz

N1 - Funding Information: The authors would thank the Deutsche Forschungsgemeinschaft (DFG) and the Hannover School for Nanotechnology (HSN) for financial funding, as well as, the Leibniz University Hannover (LUH), the University of Tsukuba, the Laboratory of Nano and Quantum Engineering (LNQE), the University of Applied Science and Arts (HsH) and the Deutscher Akademischer Austauschdienst (DAAD).

PY - 2023/5/18

Y1 - 2023/5/18

N2 - We synthesized iron(II)-triazole spin crossover compounds of the type [Fe(atrz)3]X2 and incorporated and deposited them on electrospun polymer nanofibers. For this, we used two separate electrospinning methods with the goal of obtaining polymer complex composites with intact switching properties. In view of possible applications, we chose iron(II)-triazole-complexes that are known to exhibit spin crossover close to ambient temperature. Therefore, we used the complexes [Fe(atrz)3]Cl2 and [Fe(atrz)3](2ns)2 (2ns = 2-Naphthalenesulfonate) and deposited those on fibers of polymethylmethacrylate (PMMA) and incorporated them into core–shell-like PMMA fiber structures. These core–shell structures showed to be inert to outer environmental influences, such as droplets of water, which we purposely cast on the fiber structure, and it did not rinse away the used complex. We analyzed both the complexes and the composites with IR-, UV/Vis, Mössbauer spectroscopy, SQUID magnetometry, as well as SEM and EDX imaging. The analysis via UV/Vis spectroscopy, Mössbauer spectroscopy, and temperature-dependent magnetic measurements with the SQUID magnetometer showed that the spin crossover properties were maintained and were not changed after the electrospinning processes.

AB - We synthesized iron(II)-triazole spin crossover compounds of the type [Fe(atrz)3]X2 and incorporated and deposited them on electrospun polymer nanofibers. For this, we used two separate electrospinning methods with the goal of obtaining polymer complex composites with intact switching properties. In view of possible applications, we chose iron(II)-triazole-complexes that are known to exhibit spin crossover close to ambient temperature. Therefore, we used the complexes [Fe(atrz)3]Cl2 and [Fe(atrz)3](2ns)2 (2ns = 2-Naphthalenesulfonate) and deposited those on fibers of polymethylmethacrylate (PMMA) and incorporated them into core–shell-like PMMA fiber structures. These core–shell structures showed to be inert to outer environmental influences, such as droplets of water, which we purposely cast on the fiber structure, and it did not rinse away the used complex. We analyzed both the complexes and the composites with IR-, UV/Vis, Mössbauer spectroscopy, SQUID magnetometry, as well as SEM and EDX imaging. The analysis via UV/Vis spectroscopy, Mössbauer spectroscopy, and temperature-dependent magnetic measurements with the SQUID magnetometer showed that the spin crossover properties were maintained and were not changed after the electrospinning processes.

KW - (coaxial)-electrospinning

KW - composites

KW - coordination chemistry

KW - nano fibers

KW - PMMA

KW - spin crossover

KW - triazole complexes

UR - http://www.scopus.com/inward/record.url?scp=85160626135&partnerID=8YFLogxK

U2 - 10.3390/polym15102365

DO - 10.3390/polym15102365

M3 - Article

AN - SCOPUS:85160626135

VL - 15

JO - Polymers

JF - Polymers

SN - 2073-4360

IS - 10

M1 - 2365

ER -