Evidence of Cooperative Effects for the Fe(phen)2(NCS)2 Spin Crossover Molecular Complex in Polyaniline Plus Iron Magnetite

Year: 2024

Type: article

Abstract: The spin crossover complex Fe(phen)2(NCS)2 and its composite, Fe(phen)2(NCS)2, combined with the conducting polymer polyaniline (PANI) plus varying concentrations of iron magnetite (Fe3O4) 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)2(NCS)2 with PANI plus varying concentrations of Fe3O4 nanoparticles. The hysteresis width in the composites vary no more than 2 K with respect to the pristine Fe(phen)2(NCS)2 spin crossover crystallites despite the fact that there exists a high degree of miscibility of the Fe(phen)2(NCS)2 spin crossover complex with the PANI. The Fe3O4 nanoparticles in the Fe(phen)2(NCS)2 plus PANI composite tend to agglomerate at higher concentrations regardless of the spin state of Fe(phen)2(NCS)2. Of note is that the Fe3O4 nanoparticles are shown to be antiferromagnetically coupled with the Fe(phen)2(NCS)2 when Fe(phen)2(NCS)2 is in the high spin state.

Source: Molecules

DOI: 10.3390/molecules29194574

Authors: Wai Kiat Chin, Binny Tamang, M. Zaid Zaz, Arjun Subedi, Gauthami Viswan, Alpha T. N’Diaye, Rebecca Y. Lai, Peter A. Dowben

Institutions: University of Nebraska–Lincoln, Lawrence Berkeley National Laboratory, Advanced Light Source

Language: English

Topic: Magnetism in coordination complexes

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,069

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

OpenAlex ID: W4402871393