Influence of the Central Metal Ion on the Physicochemical Properties of a Water Soluble Series of Silver Nanoparticles/Metallophthalocyanines (Fe, Co, Ni, Cu) Hybrids

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Résumé

This work reports the synthesis and characterization of nanostructured hybrid systems based on the combination of water soluble
transition-metal phthalocyanines of a Fe, Co, Ni, and Cu, and silver nanoparticles (AgNPs). Transmission electron microscopy
reveals images of the hybrid compounds, which are approximately 20 nm in size. The bathochromic shift and the broadening of
the plasmon band characteristic of AgNPs, observed in the UV-Vis spectra of the nanostructured hybrid systems, indicate the
coordination of the complexes on the nanoparticle surface. Infrared and Raman spectra confirmed an effective interaction
between the complexes, and the nanoparticles, marked in particular by a modulation of intensities and shifts in characteristic
frequencies. Raman spectroscopy identified a SERS (surface-enhanced Raman scattering) effect due to the plasmonic resonance
properties of the AgNPs. The shifts observed for the C-N-C bond follow a clear trend related to the ionic radius and the polarizing
power of the metals. Solid-state NMR 13C CP-MAS, an innovative tool for these types of compounds, yields results consistent
with those obtained for nanohybrids systems comprising Zn phthalocyanine complexes. All these results indicate the formation
of nanohybrid species, and suggest that they may be good candidates for various applications, such as photocatalysis

Mots-clés

Metallophthalocyanine, Nanoparticles, Nanohybrid, Characterization