Aniline (p.a., 99.5%, Centrohem, Serbia, ANI), was distilled under reduced
pressure and stored at room temperature under argon prior to
use. Ammonium peroxydisulfate (analytical grade, Centrohem, Serbia,
APS) and TiCl4 (Aldrich) were of analytical grade (Aldrich) and used
as received without any further purification.