2-Hexylthiophene is an extremely weak basic heteroaromatic compound. 2-Hexylthiophene can be used to modify and improve the molar absorption coefficient of ruthenium sensitizer[1]
2-Hexylthiophene is introduced to the 5-position of the terpyridine derivative ligand. And thereby, it helps to improve the molar absorption coefficient of ruthenium sensitizer.
[1]. Ozawa H, et al. Ruthenium sensitizers with a hexylthiophene-modified terpyridine ligand for dye-sensitized solar cells: synthesis, photo- and electrochemical properties, and adsorption behavior to the TiO2 surface.ACS Appl Mater Interfaces. 2015 Feb 11;7(5):3152-61.