Molecular Crystals and Liquid Crystals, Vol.604, No.1, 142-150, 2014
Synthesis, Characterization and Electrical Conductance of Ferrocenylazobenzene
Ferrocenylazobenzene was synthesized by condensing an aminoazobenzene dye with ferrocenecarboxylic acid previously treated with oxalyl chloride. The compound displayed an anticipated chemically reversible one-electron oxidation process and gave a formal potential, E degrees = 0.65V. In the UV-Vis region, the azo pi-pi* and n-pi* transitions appeared at 355 and 460nm respectively. On oxidation of the ferrocenyl moiety, the azo pi-pi* band was blue-shifted to 348nm with an increase in intensity, while a new broad, lower energy absorption band assigned to the ligand-to-metal charge transfer appeared at 622nm. The growth of this new band was concurrent with the bleaching of the metal-to-ligand charge transfer band which was largely obscured by the azo n-pi* band at 460nm. The compound in the form of thin film gave an average electrical conductivity of 0.239 +/- 0.001 Scm(-1) and a non-linear I-V curve with knee voltage at 2.3V in dark condition.