Designed magnetic multilayer thin films fabricated via the layer‐by‐layer assembly of polycyanofullerenes

Abstract

The layer-by-layer self-assembly technique was used to fabricate a series of multilayer thin films with poly[4 0 -(4-methacryloyphenyl)-2,2 0 :6 0 ,2 00 -terpyridine] (PmPhtpy), polycyanofullerenes, and transition metals (Ni 21 and Co 21 ). The polymer PmPhtpy was prepared by free-radical polymerization, and this was confirmed by Fourier transform infrared (FTIR) and 1 H-NMR spectroscopy.The polycyanofullerenes, which were characterized by FTIR, ultraviolet-visible (UV-vis), and 13 C-NMR spectroscopy, was synthesized via the bromination of fullerene and then substitution with a nucleophilic reagent [potassium cyanide (KCN)]. The optical properties of the films were measured by attenuated total reflection infrared and UV-vis spectroscopy, and the results indicate that the driving force of the fabrication of the multilayer film was the coordination interaction. The magnetic behavior was examined as a function of the magnetic field strength at 5 K and the temperature (5-300 K). The magnetic hysteresis loops of the films showed a typical S shape at 5 K; this suggested soft ferromagnetic properties.

Poly[6‐(2,6‐bis(1′‐methylbenzimidazolyl)pyridin‐4‐yloxy)hexyl acrylate] (PBIP) and its terbium (III) complex (PBIP‐Tb3+): Homopolymerization, optical, and magnetic performance

“…They are widely used as micro‐wave absorption materials, high frequency devices, and high density storage materials . Among organic magnetic materials, polymeric metal complexes are mainly studied because of their simple synthesis, various ligands and diverse coordinated modes and their magnetism comes from the long range ordering of unpaired electrons through spin‐spin interactions …”

Propriedades fotofísicas de polímeros de chalcona fluorescentes via filmes ultrafinos – LbL

“…Com isso o método de purificação tornou-se mais fácil. 34,46,47,48 Os ésteres foram obtidos com rendimentos de 50% e utilizados sem previa purificação, quando necessário foi utilizado o método de recristalização em metanol. As estruturas foram caracterizadas por espectroscopia de RMN de 1 H e 13 C e espectroscopia de massas.…”

“…As estruturas foram caracterizadas por espectroscopia de RMN de 1 H e 13 C e espectroscopia de massas. A formação dos ésteres é confirmada pelos sinais a, 164, 4 ppm, (Figura 18) e b, 165,7, (Figura 19) dos espectros de RMN de 13 C, correspondentes a carbonilas 46 47 Stempel, Guido H.; Croos, Robert P.; Mariella, R. P. ;Notes 1950, 72, 2299. 48 Atribui-se as baixas massas molares ou a não formação de estruturas poliméricas ao elevado efeito de transferência de cadeia gerado pelo AA.…”