Benzothiadiazole-based D-π-A-π-D organic dyes with tunable band gap: synthesis and photophysical properties.

A series of symmetrical D-π-A-π-D molecules based on benzothiadiazole and oligo(thienylenevinylene)s were facilely developed. The investigation of their photophysical and electrochemical properties demonstrated that these compounds exhibited broad absorption covering the whole visible range with appropriate energy levels for light-harvesting donors.