Thiophenotribenzoporphyrazines: novel near-IR absorbing dyes

The first examples of thiophenotribenzoporphyrazines have been synthesised. The compounds obtained bear either six or eight alkyl chains and show Q-band absorptions which are red shifted relative to analogous phthalocyanine derivatives. Their formulations as spin coated films show broad band absorption extending into the near IR. The compounds exhibit discotic mesophase behaviour.