New Indolo[3,2-b]indole based small organic molecules for Organic Thin Film Transistors (OTFTs): A combined experimental and DFT Study

Synthesis of new indolo[3,2-b]indoles (5a- 5j) in presence of Ag-doped ZnO and (Diacetoxyiodo) benzene system under visible-light have been reported. All the new fused linear heterocyclic indolo[3,2-b]indole systems (5a- 5j) thoroughly characterized by spectroscopic methods like mass, UV-visible, NMR and C, H, N elemental analysis. Further, their photophysical properties were carried out by combined experimental and theoretical studies. Thermogravimetric studies are carried out to confirm the thermal stability of molecules. The frontier molecular orbitals of molecules are characterized with the help of cyclic voltammetry. Additionally, the compounds of series 5 were used for the fabrication of organic thin-film transistors, which indicated the hole mobilities in the range of 0.11 - 0.85 cm(2)/Vs and with on/off ratio 10(5) on ODTS-SiO2 substrate at 50 degrees C and are also supported by DFT studies. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

This study reports the synthesis of new indolo[3,2-b]indoles in the presence of Ag-doped ZnO and (Diacetoxyiodo) benzene system under visible-light, thoroughly characterized by various spectroscopic methods. The photophysical properties, thermal stability, and frontier molecular orbitals of the compounds were investigated, and their performance as organic thin-film transistors was evaluated with promising results. The study demonstrates the potential applications of these compounds in organic electronic devices.