Lewis Acid Doped Polyaniline. Part II: Spectroscopic Studies of Emeraldine Base and Emeraldine Hydrochloride Complexation with FeCl3
Françoise Genoud , Irena Kulszewicz-Bajer , Alexandre Bedel , Jean Louis Oddou , Claudine Jeandey , Adam Proń
AbstractIt is demonstrated that Lewis acid doping of polyaniline in the oxidation state of emeraldine can be conveniently monitored by 57Fe Mössbauer spectroscopy if FeCl3 is used as the dopant. The spectrum of doped polyaniline consists of two doublets with distinctly different Mössbauer parameters which can be unequivocally ascribed to two types of complexing sites (amine and imine nitrogens). From the temperature dependence of the isomer shift and the recoil free absorption, we have calculated Mössbauer lattice temperature ?m? as probed by both complexing sites, which were 83 K for the amine and 126 K for the imine sites. These low values of ?m? imply significant mobility of the dopant at temperatures close to room temperature, which is typical of small molecules inserted into polymer matrices. FeCl3-doped polyaniline is soluble in nitromethane, and acetonitrile and films cast from these solvents show conductivity of 0.2 S/cm. FeCl3-doped polyaniline is also a strong near-infrared absorber.
|Journal series||Chemistry of Materials, ISSN 0897-4756|
|ASJC Classification||; ;|
|Publication indicators||= 83; = 80; = 88.0; : 2000 = 1.626; : 2006 = 5.104 (2) - 2007=5.536 (5)|
|Citation count*||89 (2020-09-15)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.