Magnetic copolymer, a method of manufacture and applications thereof

A magnetic copolymer with a structural unit comprising a first multivalent radical and a second multivalent radical derived from an aminoaromatic compound selected from the group consisting of an amine containing at least two condensed benzene rings, a polycyclic compound containing at least one aniline unit in its structure, and an aniline derivative substituted on the nucleus by an ethynylidene or paraphenylene side chain, these compounds being in their reduced or oxidized forms, said first and said second radical being coupled together by a carbon-nitrogen bond and the nitrogen atoms being separated by a single aromatic ring, characterized in that said first radical is derived from a compound selected from 1-naphthylamine in its reduced or oxidized form, wherein the polycyclic compound is a compound containing a number of rings equal to the number of scissions required to transform the polycyclic compound into a linear compound.