Functionalization, electroactive aniline

The synthesis and characterization of PANi-CNT composites has also been investigated [1,-22] Direct dissolution of pristine CNTs (without chemical functionalization) in aniline can occur via formation of donor acceptor charge complexes [23], Using this approach PANi-CNT composite films have been fabricated by chemical [24] or electrochemical[22, [25] polymerization of aniline containing dissolved CNTs. Alternatively, CNTs have been blended with PAne in solvents such as NMP, DMPU [26,27], The enhanced electroactivity and conductivity of the PANi-CNT composite films has been attributed to the strong interaction between CNTs and PANi, which enhances the effective degree of electron delocalization It was also shown that PANi... 

Tetra(o-aminophenyl)porphyrin, H-Co-Nl TPP, can for the purpose of electrochemical polymerization be simplistically viewed as four aniline molecules with a common porphyrin substituent, and one expects that their oxidation should form a "poly(aniline)" matrix with embedded porphyrin sites. The pattern of cyclic voltammetric oxidative ECP (1) of this functionalized metal complex is shown in Fig. 2A. The growing current-potential envelope represents accumulation of a polymer film that is electroactive and conducts electrons at the potentials needed to continuously oxidize fresh monomer that diffuses in from the bulk solution. If the film were not fully electroactive at this potential, since the film is a dense membrane barrier that prevents monomer from reaching the electrode, film growth would soon cease and the electrode would become passified. This was the case for the phenolically substituted porphyrin in Fig. 1. 

In the area of ion sensing, cation recognition by electrodes containing functionalized redox-active polymers has been an area of considerable interest. Fabre and co-workers have reported the development of a boronate-functionalized polypyrrole as a fluoride anion-responsive electroactive polymer film. The electropolymerizable polypyrrole precursor (11) (Fig. 11) was synthesized by the hydroboration reaction of l-(phenylsulfonyl)-3-vinylpyrrole with diisopinocampheylborane followed by treatment with pinacol and the deprotection of the pyrrole ring.33 The same methodology was utilized for the production of several electropolymerizable aromatic compounds (of pyrrole (12) (Fig. 11), thiophene (13 and 14) (Fig. 11), and aniline) bearing boronic acid and boronate substituents as precursors of fluoride- and/or chloride-responsive conjugated polymer.34... 

J. Yano, The transformation of electroinactive polymers derived from aniline derivatives into electroactive and functional polymers. 2. Making poly(N,N-di-N-butylaniline) films have anion exchangeability and selective potential response to dissolved iodide ions, Journal of the Electrochemical Society 1991,138, 455. 

B. A. Deore, S. Hachey, M. S. Freund, Electroactivity of electrochemically synthesized poly(aniline boronic acid) as a function of pH role of self-doping, Chemistry of Materials 2004, 16, 1427. 

---