agnetic Properties of a Polyfluorene Derivative Metallopolymer Containing Neodymium Ion

Author(s)

Santana, Alisson J. ^[1] ; Turchetti, Denis A. ^[1] ; Zanlorenzi, Cristiano ^[1] ; dos Santos, Jose C. R. ^[2] ; de Oliveira, Adilson J. A. ^[2] ; Akcelrud, Leni ^[1]

Affiliation

^[1] Univ Fed Parana, Paulo Scarpa Polymer Lab LaPPS, POB 19081, BR-81531990 Curitiba, Parana - Brazil

^[2] Univ Fed Sao Carlos, Phys Dept, POB 676, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: MACROMOLECULAR CHEMISTRY AND PHYSICS; v. 223, n. 3 DEC 2021.
• Web of Science Citations: 0

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 beta-diketone groups and another with small chorine as ligands. The large groups hinder interchain interaction, whereas the smaller salt forms favored interchain pi-stacking, providing a better interaction of the magnetic field with the polymer backbone, resulting in enhanced magnetic properties. The form with the beta-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. (AU)

• FAPESP's process: 09/54082-2 - Acquisition of a vibranting sample magnetometer coupled with a superconducting quantum interference device assensor (Squid-VSM) with cryogenic closed cycle
• Grantee: Ernesto Chaves Pereira de Souza
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC