(N-7-Azaindolyl)oligothiophenes: synthesis, characterization, and photophysical properties

A new series of mono- and oligothiophenes capped by 7-azaindoles such as 2-(N-azaindolyl)thiophene (1), 2-(N-azaindolyl)-5′-(bromo)oligothiophenes (2a-4a), and 2,5′-bis(N-azaindolyl)oligothiophenes (2b-4b) have been prepared and characterized. The crystal structures of 2b, 3b, and 4b have been determined by single-crystal X-ray diffractions. The thermal, photophysical, and electrochemical properties of all new compounds have been measured.