Self-assembled organic microfibers and nanofibers of 2,6-diphenyl dihydrodipyrrolopyrazine (DP-DPP) derivatives for optoelectronic applications

Abstract

Microfibers and nanofibers with promising application in optoelectronics are desirable in current material synthesis. Synthetic method has been developed for the preparation of dipyrrolopyrazine derivatives by employing palladium catalysed Buchwald and Sonogashira coupling reactions. A comprehensive study on the synthesis, optical properties, thermal stability and morphology of DP-DPP derivatives 8(a-d) were carried out. Surface morphological analysis showed the formation of micro fibers, square facets and nanorods. Electrochemical studies revealed HOMO energy levels in the range of -5.10 to -5.88 eV and LUMO energy levels in the range -2.49 to -3.12 eV. All compounds exhibited a high degree of thermal stability and decomposition temperature of 322-372 degrees C. The enhanced air durability and thermal stability combined with good morphology makes DPP as a promising candidate for optoelectronic application. (C) 2017 Elsevier Ltd. All rights reserved.