A new set of carbazole-containing D-π-A chromophores: Synthesis, investigation of optical and electrochemical properties in terms of position and type of a π-spacer.

A set of new chromophores of D-π-A type has been prepared; their molecules consist of an electron-donating carbazole unit-linked via π-bridges, bearing 3,4-ethylenedioxythiophene (EDOT) moiety, with an anchoring electron-deficient dicyanovinylidene group (DCV). Their UV-vis absorption and fluorescence spectra were recorded; the electrochemical properties were studied with cyclic voltammetry. As a result, such important characteristics as HOMO/LUMO energy values, bandgaps values and molar absorption coefficients were experimentally determined. It has been found that the synthesized compounds have low band gap values (∼2.2 – 2.4 eV) and show high molar absorption coefficients (∼25000-30000 M⁻¹cm⁻¹). [ABSTRACT FROM AUTHOR]