Synthesis and Properties of Narrow-sized Spherical Aramides Nanoparticles Containing Pyridine and their Copper (II) Complexes

Abstract

We report the preparation of narrow-sized well-separated spherical aramides nanoparticles containing pyridine using the precipitation polymerization method. The average diameter of the particles ranges from 50–98 nm. Particles of pyridine containing polymers exhibited large diameter compared to their phenylene counterpart. Symmetric meta-polymers showed relatively higher ηinh and thermal stability and thus higher degree of polymerization than their nonsymmetrical counterparts. Incorporation of Copper (II) ions into these polymers furnished copper-polymer complexes in a (1:2) ratio and the reported structures are proposed on the basis of their IR, UV, ESR and elemental analysis data. The ERS spectra of the complexes exhibited typical axial spectra with g// and g⊥ features and the data indicated that the copper site has a dx2-y2 ground state, characteristic of square planar or elongated octahedral stereochemistry. The incorporation of copper into aramides backbones significantly improved their optical and thermal properties. The dc electrical conductivity of polymeric copper complexes revealed different behaviors and it is obvious that the prepared pyridine-containing polymers exhibited higher σ values compared to their phenylene analogues. These types of nano-sized aramides and their copper complexes may find some applications as new semiconducting nanoparticles.