Influence of the molecular structure on the refractive index of semiconducting di‐β‐alkylated sexithiophenes

摘要: The optical absorption of thin solid films dialkylated sexithiophene derivatives (2A6T) has been measured at incident energies below the fundamental edge, where these semiconducting organic materials are transparent. spectra present interference patterns that have used for determining their refractive index n. A value 1.904 was on unsubstituted sexithiophene. Alkyl substitution leads to a decrease n, which is more pronounced as alkyl chain length increases. This behavior attributed corresponding density material. Our data compared other experimental determinations parameters thiophene oligomers and polymers published date.