Magnetic Properties of a Polyfluorene Derivative Metallopolymer Containing Neodymium Ions
Abstract: The magnetic properties of a polyfluorene derivative, {Poly[9,9’-dihexylfluorene-2,7-yl)-3,8-(1,10-phenanthroline)]} and its complexes with neodymium ions are explored and discussed in the light of the macromolecular configuration and photophysical properties. The pristine noncomplexed material is a diamagnetic material, and the introduction of Nd atoms in the polymer leads to a paramagnetic behavior over the entire temperature range. The prominent role of the morphology is demonstrated by comparison of two forms, with different ligands to the metal: one with bulky β-diketone groups and another with small chorine as ligands. The large groups hinder interchain interaction, whereas the smaller salt forms favored interchain π-stacking, providing a better interaction of the magnetic field with the polymer backbone, resulting in enhanced magnetic properties. The form with the β-diketone groups exhibits a paramagnetic behavior whereas the one in the salt form presents ferromagnetic behavior at room temperature. This contribution brings solid confirmation to the importance of interchain interaction in the magnetic properties of conjugated polymers, opening a new way to the obtainment of magnetic conjugated polymers.
Author(s): Santana, A. J.; Turchetti, D. A.; Zanlorenzi, C.; Dos Santos, J. C. R.; De Oliveira, A. J. A.; Akcelrud, L.
Macromolecular Chemistry and Physics
Published: 10 December 2021
DOI: https://doi.org/10.1002/macp.202100289
CDMF
The CDMF, hosted at the Federal University of São Carlos (UFSCar), is one of the Research, Innovation and Dissemination Centers (RIDC) supported by the São Paulo State Research Support Foundation (Fapesp), and also receives investment from the National Council Scientific and Technological Development (CNPq), from the National Institute of Science and Technology of Materials in Nanotechnology (INCTMN).
