Synthesis, Characterization and Photo-Electrochemical Conversion of 3, 5-Diamino-4-[(E)-(6-Hydroxy-1, 3-Benzothiazol-2-Yl)Diazenyl]-2-(Tricyanoethenyl) Benzoic Acid

Abstract

Recently, the organic materials have gained considerable attention in photovoltaic and optoelectronic applications such as batteries, organic field-effect transistors and organic photovoltaic cells. This work is centered on synthesis, characterization and photo-electrochemical conversion of 3, 5-diamino-4-[(e)-(6-hydroxy-1, 3-benzothiazol-2-yl)diazenyl]-2-(tricyanoethenyl) benzoic acid. Standard procedures were used to successfully synthesize two novel dyes with the structural configuration of D-π-bridge-D-A (donor-π- bridge-donor-acceptor). The colour of the dye spans from brown red to dark brown with a melting point that spans from 164-182°C. The ¹H and ¹³C-NMR spectroscopy for dye 44 and 66  and from the result  seven signals with a highly characteristic de-shielded carboxylic protons at 10.40 ppm (¹H, Singlet) and the hydroxyl protons 10.04 ppm. The ¹³C –NMR spectrum of the Dye 44 showed a signal at 173.51 ppm for carbon atom of the carboxylic groups while a signal at 157.29 ppm was attributable to the carbon atom of the thiazole ring. The ability of a solar cell to generate photocurrent at a given wavelength of the incident light was measured by the incident monochromatic photon to current conversion  efficiency (IPCE) and the result was observed to ranged from 54.9% (at 440 nm) and  54% (at 420nm) for Dye 66 which confirm that photon from sun have been fully converted into current.