Synthesis of Indium Complexes for Thin Film Transistor Applications Bearing N-Alkoxy Carboxamide Ligands

Abstract

By reacting equimolar amount of trimethylindium with various N-alkoxy carboxamidate type-ligands in a single step reaction, new series of indium complexes (1-3), [In(CH3)2(L)]2 (L1H= N-methoxypropionamide (mpaH), L2H=N-ethoxy-2-methyl propanamide (empaH), L3H=N-ethoxy-2,2-dimethyl propanamide (edpaH)), were successfully synthesized. All complexes were fully characterized by FTIR and NMR spectroscopy along with elemental and thermogravimetric (TG) analyses. While complex 1 and 2 were solid in room temperature, complex 3 which relatively bulkier ligand L3H was introduced was in liquid state. Among them, complex 1 was structurally characterized by single crystal X-ray diffraction. Complex 1 existed in a tetragonal I4(1)/a space group that consist of a pair enantiomers. A sharp weight loss between 130 °C and 230 °C in a single step in TGA for all complexes showed outstanding volatility properties with lowest residual mass of 10% which are a crucial factor in thin film industry. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim