Bipolar styrylquinozolinone chromophores: Synthesis, optical and electrochemical properties

Abstract

A series of styrylquinozolinones, designated as <strong>SQ 1-4</strong> have been synthesized and investigated for their photophysical and electrochemical properties. Both HOMO and LUMO levels are markedly affected by the extent of π-electron polarization in these systems. The donor-π-acceptor systems, <strong>SQ 1-2</strong> exhibit red shifted absorption and emission bands as well as relatively lower band gaps compared to <strong>SQ 3-4</strong> possessing acceptor-π-acceptor architecture. Our findings suggest that <strong>SQ 1-4</strong> can potentially function as bipolar transporting systems, with <strong>SQ 1-2</strong> and <strong>SQ 3-4 </strong> qualifying as green and blue electroluminescent materials, respectively.