Evidence of Cooperative Effects for the Fe(phen)2(NCS)2 Spin Crossover Molecular Complex in Polyaniline Plus Iron Magnetite
The spin crossover complex Fe(phen)<sub>2</sub>(NCS)<sub>2</sub> and its composite, Fe(phen)<sub>2</sub>(NCS)<sub>2</sub>, combined with the conducting polymer polyaniline (PANI) plus varying concentrations of iron magnetite (Fe<sub>3</sub>O<sub>4</sub>) nanoparticles were studied. A cooperative effect is evident from the hysteresis width in the plot of magnetic susceptibility multiplied by temperature versus temperature (χmT versus T) for Fe(phen)<sub>2</sub>(NCS)<sub>2</sub> with PANI plus varying concentrations of Fe<sub>3</sub>O<sub>4</sub> nanoparticles. The hysteresis width in the composites vary no more than 2 K with respect to the pristine Fe(phen)<sub>2</sub>(NCS)<sub>2</sub> spin crossover crystallites despite the fact that there exists a high degree of miscibility of the Fe(phen)<sub>2</sub>(NCS)<sub>2</sub> spin crossover complex with the PANI. The Fe<sub>3</sub>O<sub>4</sub> nanoparticles in the Fe(phen)<sub>2</sub>(NCS)<sub>2</sub> plus PANI composite tend to agglomerate at higher concentrations regardless of the spin state of Fe(phen)<sub>2</sub>(NCS)<sub>2</sub>. Of note is that the Fe<sub>3</sub>O<sub>4</sub> nanoparticles are shown to be antiferromagnetically coupled with the Fe(phen)<sub>2</sub>(NCS)<sub>2</sub> when Fe(phen)<sub>2</sub>(NCS)<sub>2</sub> is in the high spin state.
Authors
- Gauthami Viswan
- Rebecca Y. Lai (ORCID: https://orcid.org/0000-0002-1732-9481)
- P. A. Dowben (ORCID: https://orcid.org/0000-0002-2198-4710)
- Wai Kiat Chin (ORCID: https://orcid.org/0000-0002-1840-0825)
- Alpha T. N’Diaye (ORCID: https://orcid.org/0000-0001-9429-9776)
- M. Zaid Zaz (ORCID: https://orcid.org/0000-0001-7849-4715)
- Arjun Subedi (ORCID: https://orcid.org/0000-0002-7581-8144)
- Binny Tamang
Institutions
- University of Nebraska–Lincoln (US)
- Lawrence Berkeley National Laboratory (US)
Publication Details
- Journal
- Molecules
- Published
- 2024-09-26
- DOI
- https://doi.org/10.3390/molecules29194574
- Citations
- 2
- Primary Topic
- Magnetism in coordination complexes
- Type
- article
- Field-Weighted Citation Impact
- 0.24
Funders
- National Science Foundation
- U.S. Department of Energy
- Office of Science
- Division of Materials Research
- Division of Electrical, Communications and Cyber Systems
- Basic Energy Sciences
- Office of Experimental Program to Stimulate Competitive Research
- Lawrence Berkeley National Laboratory