Novel bipolar diaryloxadiazole-benzofuran conjugates: Synthesis, optical, electrochemical and thermal studies

Abstract

368-373<span style="font-size:9.0pt;mso-bidi-font-size: 8.0pt;font-family:" times="" new="" roman","serif";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-US">A series of diaryloxadiazole chromophores incorporating benzofuran rings of varying donor characters has been readily synthesized in a one step protocol. These donor-acceptor-donor systems, designated as <b style="mso-bidi-font-weight: normal">Benzmox-1-4 exhibit positive solvatochromic behavior and thermal stabilities in excess of 300°C. From cyclic voltammetry and emission band data, the HOMO and LUMO energies of Benzmox-1-4 have been calculated to be in the range of 6.43 to 5.65 eV and 2.96 to 3.29 eV, respectively. Of the four chromophoric systems studied, Benzmox-2 and<span style="mso-bidi-font-weight: bold"> Benzmox-3 display band gaps of 3.22 and 3.16 eV, and high luminescence efficiency of 0.34 and 0.55, respectively. These features make Benzmox-2 and<b style="mso-bidi-font-weight: normal"> Benzmox-3 promising bipolar blue light emitting host materials.</span