Chemical Doping of Triphenylamine-Benzaldehyde Polymers

Abstract

A series of different benzaldehydes-4-tolyldiphenylamine polymers has been oxidized by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and tetrachloro-1,4-benzoquinone (p-chloranil), and also doped by 10-camphorsulfonic acid in order to increase their conductivity. The doped polymers were characterized by 1 H NMR spectroscopy, cyclic voltammetry, UV, and IR spectroscopy. It was found by 1 H NMR spectroscopy that the oxidation yield increased with the increased amount of oxidation agent. It was shown that optical and electrochemical bandgaps of the polymers decreased after oxidation. Conductivity measurements revealed that the applied oxidation and doping procedure resulted in decreased electrical resistance of their initial polymers, down to the level of semiconducting materials. An increased thermal stability of the polymer after oxidation was confirmed by differential scanning calorimetry.

Synthesis and Properties of a Chiroptically Active Oligomer from 3,4-Ethylenedioxythiophene and (–)-Myrtenal

“…Poly(3,4-ethylenedioxythiophene) (PEDOT) and its derivatives are widely studied conjugated polymers due to their relatively low ionization potential, high electrical conductivity, and good stability [ 15 , 16 , 17 , 18 , 19 , 20 ]. A conjugated polymer which has benzenoid and quinonoid alternating structure in the main chain bridged via methine group (methine polymer) has been paid much attention because of the relatively small-bandgap [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Polycondensation between arylene unit and aldehyde group in the presence of sulfuric acid has been developed [ 28 , 29 ].…”