The Anthranil Core as a π‑Conjugated Bridge in the Synthesis of Molecular Photosensitizers

Molecular photosensitizers based on the anthranil core
were synthesized
through a six-step linear synthesis featuring a Suzuki coupling at
the C7 position and a controlled C3–H arylation. The introduction
of donor and acceptor groups allowed the synthesis of unsymmetrical
photosensitizers that were then investigated, revealing different
spectroscopic and optoelectronic properties. Transient spectroscopy
of excited species indicated that placing the acceptor at C7 and the
donor group at C3 altered the energy levels around the anthranil core,
making these dyes attractive for photovoltaic applications.