Magnetic properties of a polyfluorene derivative containing complexed neodymium ions

ABSTRACT Poly[9,9′‐dihexylfluorene‐2,7‐diyl)‐6,6″‐(2,2′:6′,2″‐terpyridine)] (LaPPS75) and its complexes with neodymium were synthesized and characterized. Magnetic measurements showed that the noncomplexed polymer presented a ferromagnetic contribution due to the formation of π stacking, and that in...

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Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2019-03, Vol.57 (6), p.304-311
Main Authors: Santana, Alisson J., Turchetti, Denis A., Zanlorenzi, Cristiano, Santos, José C. R., Laureto, Edson, De Oliveira, Adilson J. A., Akcelrud, Leni
Format: Article
Language:English
Subjects:
Chemical synthesis
conjugated polymers
Ferromagnetism
Low molecular weights
Magnetic measurement
magnetic polymers
Magnetic properties
Magnetism
metal‐polymer complex
Neodymium
Polymers
terpyridine
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Summary:ABSTRACT Poly[9,9′‐dihexylfluorene‐2,7‐diyl)‐6,6″‐(2,2′:6′,2″‐terpyridine)] (LaPPS75) and its complexes with neodymium were synthesized and characterized. Magnetic measurements showed that the noncomplexed polymer presented a ferromagnetic contribution due to the formation of π stacking, and that in absence of those, the ferromagnetic behavior is suppressed. The pristine polymer, the complexed one and a low‐molecular‐weight model compound with the same structure of the complexed site in the parent polymer were studied. The observed behavior found is presented and discussed, the most important finding was that when a conjugated chain is used as a host for the metallic ion, an amplification of four times for the magnetization is achieved, using the same metallic content for complexed polymer and model compound for comparison. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 304–311 The magnetic properties of an alternated copolymer of fluorene‐terpyridine complexed with neodymium were studied. The results showed important differences as compared to a low‐molecular‐weight model compound and to a noncomplexed parent copolymer as well. An amplification of four times for the magnetization was achieved with the insertion of the metallic ion. The π stacking of the pristine copolymer played an important role in the magnetic properties of the pristine copolymer.
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.24785