Star-shaped Thiourea Derivative as Single Molecule Conductive Thin Film

Abstract

The electronic delocalization in extended π-orbital system of conjugated organic molecules brings significant contribution and has lead for further investigation to exploit this system to be used as potential conductive thin film. In this work, a star-shaped thiourea, N1,N3,N5-tris(4-(nonyloxy)phenyl)-N’-(benzene-1,3,5 tricarbonyl) thiourea (STU) based on Donor(D)-π-Acceptor(A) system was successfully synthesized from continuous reactions of intermediate compound 4-nonyloxy aniline hydrochloride with benzene-1,3,5-tricarboxylic acid chloride prior to form active substrate in the form of film. These compounds were characterized via several spectroscopic and analytical methods namely IR, UV-Vis, CHNS elemental analysis, 1H and 13C NMR as well TGA analysis. The investigation of its potential as dopant system in conductive film was fabricated on ITO substrate prior to the evaluation of its conductivity properties which was carried out by Four Point Probe. The findings from the conductivity analysis revealed that the prepared film performed better and exhibited increasing conductivity up to 0.1066Scm-1 under maximum light intensity of 50Wm-2. Thus, this proposed molecular structure of A-C(O)NHC=SNHAr-D has given ideal indication to act as conductive film and has opened wide potential for various applications particularly in molecular electronic devices.